Title: Cheap flights from Washington to Sidney (DCA to SDY) - Expedia.com ![Adobe](https://images.trvl-media.com/place/3119/a06eb185-b670-43b5-a222-b9723a9fdab0.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/3119/a06eb185-b670-43b5-a222-b9723a9fdab0.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from Washington (DCA) to Sidney (SDY) ## Popular airlines from Ronald Reagan Washington National Airport (DCA) to Sidney, MT (SDY-Sidney-Richland Municipal) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_B6.svg) JetBlue Airways [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines [](https://www.expedia.com/Flights-Search?leg1=from:DCA,to:SDY,departure:3/28/2026TANYT&leg2=from:SDY,to:DCA,departure:4/4/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) ## Cheap Flights from Washington to Sidney (DCA-SDY) Prices were available within the past 7 days and start at for one-way flights and $486 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $486 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:485.21&airProductToken=AQqUAQoxCNWCARIDNDQxGEMgrhwo0L2dAzDNvp0DOEtAAFgBagdFQ09OT01ZcghLRkEyQURETgozCNWCARIENTkzMhiuHCCBWiiEv50DMM3AnQM4S0ABWAFqB0VDT05PTVlyCEtGQTJBREROCioIuZYBEgQxNzgxGIFaIPLAASiXwZ0DMP3BnQM4U0ABWAFqAkVScgNTSVAKlQEKKgi5lgESBDE3ODAY8sABIIFaKMCVnwMws5afAzhTQABYAWoCRVJyA1NJUAozCNWCARIENTQyNBiBWiCuHCjylp8DMKaYnwM4S0ABWAFqB0VDT05PTVlyCEtGQTJBREROCjII1YIBEgQyMTYwGK4cIEMo6ZmfAzDOmp8DOEtAAVgBagdFQ09OT01ZcghLRkEyQUREThIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $511 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:510.21&airProductToken=AQqQAQovCMGCARIDNjM0GEMgo7EBKLK9nQMwjr-dAzhPQABYAWoETUFJTnIIT1VGSFpOTTMKMQjBggESBDQwOTUYo7EBIIFaKJnAnQMwzsGdAzhPQAFYAWoETUFJTnIIT1VGSFpOTTMKKgi5lgESBDE3ODkYgVog8sABKKvCnQMwkcOdAzhTQAFYAWoCRVJyA1NJUAqRAQoqCLmWARIEMTc3OBjywAEggVooy5SfAzC-lZ8DOFNAAFgBagJFUnIDU0lQCjEIwYIBEgQ0MDk1GIFaIKOxASjKl58DMPaYnwM4UUABWAFqBE1BSU5yCFFWRlpaTk0zCjAIwYIBEgQyNzUyGKOxASBDKMaZnwMw8JqfAzhRQAFYAWoETUFJTnIIUVZGWlpOTTMSCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $528 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:527.21&airProductToken=AQqRAQowCMGCARIEMTk3OBhDIKOxASj9vZ0DMNW_nQM4TkAAWAFqBE1BSU5yCE5VRkhaTk0zCjEIwYIBEgQ0MDk1GKOxASCBWiiZwJ0DMM7BnQM4TkABWAFqBE1BSU5yCE5VRkhaTk0zCioIuZYBEgQxNzg1GIFaIPLAASjlw50DMMvEnQM4U0ABWAFqAkVScgNTSVAKkQEKKgi5lgESBDE3NzgY8sABIIFaKMuUnwMwvpWfAzhTQABYAWoCRVJyA1NJUAoxCMGCARIENDA5NRiBWiCjsQEoypefAzD2mJ8DOFFAAVgBagRNQUlOcghRVkZaWk5NMwowCMGCARIEMjc1MhijsQEgQyjGmZ8DMPCanwM4UUABWAFqBE1BSU5yCFFWRlpaTk0zEgwIARABGAEqAkFBMgAYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $542 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:541.21&airProductToken=AQqUAQoxCNWCARIDNDQxGEMgrhwo0L2dAzDNvp0DOEtAAFgBagdFQ09OT01ZcghLRkEyQURETgozCNWCARIENTkzMhiuHCCBWiiEv50DMM3AnQM4S0ABWAFqB0VDT05PTVlyCEtGQTJBREROCioIuZYBEgQxNzg1GIFaIPLAASjlw50DMMvEnQM4U0ABWAFqAkVScgNTSVAKlQEKKgi5lgESBDE3ODAY8sABIIFaKMCVnwMws5afAzhTQABYAWoCRVJyA1NJUAozCNWCARIENTQyNBiBWiCuHCjylp8DMKaYnwM4VEABWAFqB0VDT05PTVlyCFRBWDJBRkROCjII1YIBEgQxMzY5GK4cIEMogJmfAzDnmZ8DOFRAAVgBagdFQ09OT01ZcghUQVgyQUZEThIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $841 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:840.49&airProductToken=AQrHAQowCNWCARIEMjc3NBhDIK4cKOa-nQMw8r-dAzhXQABYAWoFMl9lY29yCFdBQTRQS0ROCjEI1YIBEgQxMTEzGK4cIINpKOXAnQMwg8KdAzhXQABYAWoFMl9lY29yCFdBVTBQRkROCjEI1YIBEgQ1NDk4GINpIIFaKNDCnQMws8OdAzhXQABYAWoFMl9lY29yCFdBVTBQRkROCi0IuZYBEgQxNzg1GIFaIPLAASjiw50DMMjEnQM4U0AAWAFqBTJfZWNvcgNTSVAKlAEKLQi5lgESBDE3ODAY8sABIIFaKM2VnwMwuJafAzhTQABYAWoFMl9lY29yA1NJUAoxCNWCARIENTQyNBiBWiCuHCjylp8DMKaYnwM4S0AAWAFqBTJfZWNvcghLRkEyQURETgowCNWCARIEMjE2MBiuHCBDKOmZnwMwzpqfAzhLQABYAWoFMl9lY29yCEtGQTJBREROEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $859 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:858.51&airProductToken=AQqTAQovCNWCARIDNDQxGEMgrhwo0L2dAzDNvp0DOEtAAFgBagUyX2Vjb3IIS0ZBMkFERE4KMQjVggESBDU5MzIYrhwggVoohL-dAzDNwJ0DOEtAAFgBagUyX2Vjb3IIS0ZBMkFERE4KLQi5lgESBDE3ODEYgVog8sABKJfBnQMw_cGdAzhTQABYAWoFMl9lY29yA1NJUArJAQotCLmWARIEMTc4OBjywAEggVoog5ifAzDumJ8DOFNAAFgBagUyX2Vjb3IDU0lQCjEI1YIBEgQ0NjM3GIFaIINpKLOZnwMwoJqfAzhXQABYAWoFMl9lY29yCFdBQTRBRkROCjII1YIBEgQxNzQ1GINpIMSNASiQnJ8DMOmdnwM4V0AAWAFqBTJfZWNvcghXQUE0QUZETgoxCNWCARIENDQzNBjEjQEgQyjQnp8DMJ-fnwM4V0AAWAFqBTJfZWNvcghXQUEyT0ZEThIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAs) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $897 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:896.50&airProductToken=AQrGAQovCNWCARIDNzgxGEMgrhwoor-dAzCXwJ0DOFdAAFgBagUyX2Vjb3IIV0FBNFBLRE4KMQjVggESBDExMTMYrhwgg2ko5cCdAzCDwp0DOFdAAFgBagUyX2Vjb3IIV0FVMFBGRE4KMQjVggESBDU0OTgYg2kggVoo0MKdAzCzw50DOFdAAFgBagUyX2Vjb3IIV0FVMFBGRE4KLQi5lgESBDE3ODUYgVog8sABKOLDnQMwyMSdAzhTQABYAWoFMl9lY29yA1NJUAqUAQotCLmWARIEMTc4MBjywAEggVoozZWfAzC4lp8DOFNAAFgBagUyX2Vjb3IDU0lQCjEI1YIBEgQ1NDI0GIFaIK4cKPKWnwMwppifAzhUQABYAWoFMl9lY29yCFRBWDJBRkROCjAI1YIBEgQxMzY5GK4cIEMogJmfAzDnmZ8DOFRAAFgBagUyX2Vjb3IIVEFYMkFGRE4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $907 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:906.51&airProductToken=AQrJAQoxCNWCARIENDQzMBhDIMSNASiMvp0DMNy-nQM4VkAAWAFqBTJfZWNvcghWQUE0T0ZFTgoyCNWCARIEMTk5ORjEjQEgg2ko_L-dAzCDwp0DOFdAAFgBagUyX2Vjb3IIV0FVMEJGRE4KMQjVggESBDU0OTgYg2kggVoo0MKdAzCzw50DOFdAAFgBagUyX2Vjb3IIV0FVMEJGRE4KLQi5lgESBDE3ODUYgVog8sABKOLDnQMwyMSdAzhTQABYAWoFMl9lY29yA1NJUAqUAQotCLmWARIEMTc4MBjywAEggVoozZWfAzC4lp8DOFNAAFgBagUyX2Vjb3IDU0lQCjEI1YIBEgQ1NDI0GIFaIK4cKPKWnwMwppifAzhUQABYAWoFMl9lY29yCFRBWDJBRkROCjAI1YIBEgQxMzY5GK4cIEMogJmfAzDnmZ8DOFRAAFgBagUyX2Vjb3IIVEFYMkFGRE4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $970 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:969.50&airProductToken=AQrHAQowCNWCARIEMTA2MRhDIK4cKKq-nQMwpb-dAzhWQABYAWoFMl9lY29yCFZBQTRBS0ROCjEI1YIBEgQyNzUxGK4cIINpKPK_nQMwjMGdAzhWQABYAWoFMl9lY29yCFZGQTBPREVOCjEI1YIBEgQ1NDk4GINpIIFaKNDCnQMws8OdAzhWQABYAWoFMl9lY29yCFZGQTBPREVOCi0IuZYBEgQxNzg1GIFaIPLAASjiw50DMMjEnQM4U0AAWAFqBTJfZWNvcgNTSVAKlAEKLQi5lgESBDE3ODAY8sABIIFaKM2VnwMwuJafAzhTQABYAWoFMl9lY29yA1NJUAoxCNWCARIENTQyNBiBWiCuHCjylp8DMKaYnwM4VEAAWAFqBTJfZWNvcghUQVgyQUZETgowCNWCARIEMTM2ORiuHCBDKICZnwMw55mfAzhUQABYAWoFMl9lY29yCFRBWDJBRkROEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $1,793 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1793.00&airProductToken=AQrGAQovCNWCARIDNzgxGEMgrhwoor-dAzCXwJ0DOFdAAFgBagUyX2Vjb3IIV0FBNFBLRE4KMQjVggESBDExMTMYrhwgg2ko5cCdAzCDwp0DOFdAAFgBagUyX2Vjb3IIV0FVMFBGRE4KMQjVggESBDU0OTgYg2kggVoo0MKdAzCzw50DOFdAAFgBagUyX2Vjb3IIV0FVMFBGRE4KLQi5lgESBDE3ODUYgVog8sABKOLDnQMwyMSdAzhTQABYAWoFMl9lY29yA1NJUAqUAQotCLmWARIEMTc4MBjywAEggVoozZWfAzC4lp8DOFNAAFgBagUyX2Vjb3IDU0lQCjEI1YIBEgQ1NDI0GIFaIK4cKPKWnwMwppifAzhUQABYAWoFMl9lY29yCFRBWDJBRkROCjAI1YIBEgQxMzY5GK4cIEMogJmfAzDnmZ8DOFRAAFgBagUyX2Vjb3IIVEFYMkFGRE4SDAgBEAEYASoCVUEyABgBIgQIARABKAIoAygEMAs) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $1,814 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1813.02&airProductToken=AQrJAQoxCNWCARIENDU5MRhDIMSNASjIvp0DMJi_nQM4VkAAWAFqBTJfZWNvcghWQUE0T0ZFTgoyCNWCARIEMTk5ORjEjQEgg2ko_L-dAzCDwp0DOFdAAFgBagUyX2Vjb3IIV0FVMEJGRE4KMQjVggESBDU0OTgYg2kggVoo0MKdAzCzw50DOFdAAFgBagUyX2Vjb3IIV0FVMEJGRE4KLQi5lgESBDE3ODUYgVog8sABKOLDnQMwyMSdAzhTQABYAWoFMl9lY29yA1NJUAqUAQotCLmWARIEMTc4MBjywAEggVoozZWfAzC4lp8DOFNAAFgBagUyX2Vjb3IDU0lQCjEI1YIBEgQ1NDI0GIFaIK4cKPKWnwMwppifAzhUQABYAWoFMl9lY29yCFRBWDJBRkROCjAI1YIBEgQxMzY5GK4cIEMogJmfAzDnmZ8DOFRAAFgBagUyX2Vjb3IIVEFYMkFGRE4SDAgBEAEYASoCVUEyABgBIgQIARABKAIoAygEMAs) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $1,953 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1953.00&airProductToken=AQrHAQowCNWCARIEMTA2MRhDIK4cKKq-nQMwpb-dAzhXQABYAWoFMl9lY29yCFdBQTRQS0ROCjEI1YIBEgQyNzUxGK4cIINpKPK_nQMwjMGdAzhRQABYAWoFMl9lY29yCFFBQTBPRkVOCjEI1YIBEgQ1NDk4GINpIIFaKNDCnQMws8OdAzhRQABYAWoFMl9lY29yCFFBQTBPRkVOCi0IuZYBEgQxNzg1GIFaIPLAASjiw50DMMjEnQM4U0AAWAFqBTJfZWNvcgNTSVAKlAEKLQi5lgESBDE3ODAY8sABIIFaKM2VnwMwuJafAzhTQABYAWoFMl9lY29yA1NJUAoxCNWCARIENTQyNBiBWiCuHCjylp8DMKaYnwM4VEAAWAFqBTJfZWNvcghUQVgyQUZETgowCNWCARIEMTM2ORiuHCBDKICZnwMw55mfAzhUQABYAWoFMl9lY29yCFRBWDJBRkROEgwIARABGAEqAlVBMgAYASIECAEQASgCKAMoBDAL) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $3,388 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:3387.20&airProductToken=AQqeAQozCNWCARIDNDQxGEMgrhwo0L2dAzDNvp0DOFlAAFgBagk3X2Vjb3VucnNyCFlBQTBBREVZCjUI1YIBEgQ1OTMyGK4cIIFaKIS_nQMwzcCdAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWQowCLmWARIEMTc4MRiBWiDywAEol8GdAzD9wZ0DOFlAAFgBagk3X2Vjb3VucnNyAlk5Cp8BCjAIuZYBEgQxNzgwGPLAASCBWijNlZ8DMLiWnwM4WUAAWAFqCTdfZWNvdW5yc3ICWTkKNQjVggESBDU0MjQYgVogrhwo8pafAzCmmJ8DOFlAAFgBagk3X2Vjb3VucnNyCFlBQTBBREVZCjQI1YIBEgQxMzY5GK4cIEMogJmfAzDnmZ8DOFlAAFgBagk3X2Vjb3VucnNyCFlBQTBBREVZEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $4,477 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4476.50&airProductToken=AQrYAQo1CNWCARIENDQzMBhDIMSNASiMvp0DMNy-nQM4WUAAWAFqCTdfZWNvdW5yc3IIWUFBMEFERVkKNgjVggESBDE5OTkYxI0BIINpKPy_nQMwg8KdAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWQo1CNWCARIENTQ5OBiDaSCBWijQwp0DMLPDnQM4WUAAWAFqCTdfZWNvdW5yc3IIWUFBMEFERVkKMAi5lgESBDE3ODUYgVog8sABKOLDnQMwyMSdAzhZQABYAWoJN19lY291bnJzcgJZOQqfAQowCLmWARIEMTc4MBjywAEggVoozZWfAzC4lp8DOFlAAFgBagk3X2Vjb3VucnNyAlk5CjUI1YIBEgQ1NDI0GIFaIK4cKPKWnwMwppifAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWQo0CNWCARIEMTM2ORiuHCBDKICZnwMw55mfAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWRIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAs) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $4,577 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:4576.49&airProductToken=AQrWAQo0CNWCARIEMTA2MRhDIK4cKKq-nQMwpb-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) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $8,953 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:8953.00&airProductToken=AQrYAQo1CNWCARIENDU5MRhDIMSNASjIvp0DMJi_nQM4WUAAWAFqCTdfZWNvdW5yc3IIWUFBMEFERVkKNgjVggESBDE5OTkYxI0BIINpKPy_nQMwg8KdAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWQo1CNWCARIENTQ5OBiDaSCBWijQwp0DMLPDnQM4WUAAWAFqCTdfZWNvdW5yc3IIWUFBMEFERVkKMAi5lgESBDE3ODUYgVog8sABKOLDnQMwyMSdAzhZQABYAWoJN19lY291bnJzcgJZOQqfAQowCLmWARIEMTc4MBjywAEggVoozZWfAzC4lp8DOFlAAFgBagk3X2Vjb3VucnNyAlk5CjUI1YIBEgQ1NDI0GIFaIK4cKPKWnwMwppifAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWQo0CNWCARIEMTM2ORiuHCBDKICZnwMw55mfAzhZQABYAWoJN19lY291bnJzcghZQUEwQURFWRIMCAEQARgBKgJVQTIAGAEiBAgBEAEoAigDKAQwCw) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Nov 18 - Mon, Dec 7 DCA Washington SDY Sidney $9,153 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:DCA,to:SDY,departure:11/18/2026TANYT&leg2=from:SDY,to:DCA,departure:12/7/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:9152.98&airProductToken=AQrWAQo0CNWCARIEMTA2MRhDIK4cKKq-nQMwpb-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) ![](https://forever.travel-assets.com/flex/flexmanager/images/2026/02/06/expedia-sale-2026-desktop-us-ca.jpg?impolicy=fcrop&w=1400&h=600&q=mediumHigh) ## The Annual Vacation Sale Members save up to 40% on hotels and homes. Plan this year’s big trip and save. [Book now](https://expedia.com/deals?rfrr=FTG_SPRING_PROMO_) ## Frequently asked questions ### How much does a flight from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal) cost? ### What is the cheapest month to fly from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### Which airlines fly direct from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### What is the cheapest airline that flies from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### How do I find cheap flights from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### What is the best time to fly from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### What is the earliest flight from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### How long does it take to fly from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### Can you fly business or first class from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ### How do I earn miles on a Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal) flight with Expedia? ### Is it cheaper to buy a plane ticket from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal) at the last minute? ### Is it cheaper to book a Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal) flight and hotel package? ### Can I cancel or change the date of my flight from Washington, DC (DCA-Ronald Reagan Washington National) to Sidney, MT (SDY-Sidney-Richland Municipal)? ## Travel information | Origin airport | Ronald Reagan Washington National | | ------------------- | --------------------------------- | | Destination airport | Sidney-Richland Municipal | | Roundtrip price | $485 | | Distance | 1486 mi | ## Book with confidence # Washington to Sidney Flights The cheapest times to fly from Washington to Sidney On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Sidney are during the month of November. You can find some of the cheapest flights from Washington to Sidney with Expedia's search tool and vast selection of airlines. The best time to book a flight from Washington to Sidney Sunday is one of the best days to book for cheap flights from Washington to Sidney: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance. How to find cheap round-trip tickets from Washington to Sidney Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Sidney in 2026\. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference\*. This is available for a small fee, and is free to One Key Gold and Platinum tier members. Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Sidney flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps. You could also save big by booking one of Expedia's [vacation packages](https://www.expedia.com/package-deals). Bundling together your Washington to Sidney airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures. \*Terms apply. Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023\. The percentages you see are averages. \*Flight schedules are subject to change. ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - Vacation Rentals - [Hotels near Sidney Country Club ](https://www.expedia.com/Sidney-Country-Club-Hotels.0-l6310248-0.Travel-Guide-Filter-Hotels) - [Hotels near Richland County Fair Event Center and Fairgrounds ](https://www.expedia.com/Richland-County-Fair-Event-Center-And-Fairgrounds-Hotels.0-l553248621560799347-0.Travel-Guide-Filter-Hotels) - [Hotels near Sidney Health Center ](https://www.expedia.com/Sidney-Health-Center-Hotels.0-l553248621560799346-0.Travel-Guide-Filter-Hotels) - [Hotels near Central Park ](https://www.expedia.com/Central-Park-Hotels.0-l6310241-0.Travel-Guide-Filter-Hotels) - [Sidney Hotels ](https://www.expedia.com/Sidney-Hotels.d3119.Travel-Guide-Hotels) - [Extended Stay Hotels in Sidney ](https://www.expedia.com/Sidney-Hotels-Extended-Stay-Hotels.0-0-d3119-tExtendedStayHotels.Travel-Guide-Filter-Hotels) - 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