Title: Cheap flights from Chicago to Posadas (CHI to PSS) - Expedia.com ![Rock formation "El Arco" at Lake Posadas, Argentina](https://images.trvl-media.com/place/2887/d836a022-182c-4be3-ade6-4b3bb9158f9d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/2887/d836a022-182c-4be3-ade6-4b3bb9158f9d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from Chicago (CHI) to Posadas (PSS) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travelers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Chicago to Posadas (PSS-Libertador General Jose de San Martin) - ![](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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&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:CHI,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:CHI,departure:3/16/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our OneKeyCash [Learn about One Key](https://www.expedia.com/welcome-one-key) ## Cheap Flights from Chicago to Posadas (CHI-PSS) Prices were available within the past 7 days and start at for one-way flights and $1,160 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Tue, May 12 - Mon, May 18 ORD Chicago PSS Posadas $1,160 Roundtrip found 14 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/12/2026TANYT&leg2=from:PSS,to:ORD,departure:5/18/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1159.93&airProductToken=AQplCh8IwawBEgMyNjMYrhwgwTMo5OuMAzDW7owDOFBAAFgBCh8IwawBEgMxNTUYwTMggHkoh_aMAzCI-YwDOFBAAVgBCiEIwaQBEgQxNzYyGIB5IM-UASij-owDMIf7jAM4VEABWAEKZAohCMGkARIEMTc2ORjPlAEggHkoza2NAzCxro0DOFRAAFgBCh4IwawBEgI4OBikJiDBMyiCso0DMP60jQM4UEABWAEKHwjBrAESAzI2MhjBMyCuHCjGto0DMMy5jQM4UEABWAESCggBEAEYASoCQVYYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Thu, May 7 - Tue, May 19 ORD Chicago PSS Posadas $1,187 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/7/2026TANYT&leg2=from:PSS,to:ORD,departure:5/19/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1186.53&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgojLCMAzDGsYwDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYokLKMAzDUtowDOFRAAVgBCiEIwaQBEgQxNzY4GIB5IM-UASiBvIwDMOW8jAM4RUABWAEKZgohCMGkARIEMTc2ORjPlAEgpCYo7biNAzDRuY0DOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgo4MONAzDCyI0DOFRAAVgBCiAI1YIBEgQyMTgyGIg4IK4cKMjJjQMw-MqNAzhUQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Thu, May 14 - Mon, May 18 ORD Chicago PSS Posadas $1,190 Roundtrip found 14 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/14/2026TANYT&leg2=from:PSS,to:ORD,departure:5/18/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1189.93&airProductToken=AQpmCh8IwawBEgMyNjMYrhwgwTMopIKNAzCWhY0DOFBAAFgBCiAIwawBEgQ4Mzk1GMEzIKQmKP-FjQMwgImNAzhPQAFYAQohCMGkARIEMTc2MhiAeSDPlAEo45CNAzDHkY0DOFFAAVgBCmQKIQjBpAESBDE3NjkYz5QBIIB5KM2tjQMwsa6NAzhUQABYAQoeCMGsARICODgYpCYgwTMogrKNAzD-tI0DOFBAAVgBCh8IwawBEgMyNjIYwTMgrhwoxraNAzDMuY0DOFBAAVgBEgoIARABGAEqAkFWGAEiBAgBEAEoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Thu, May 7 - Thu, May 14 ORD Chicago PSS Posadas $1,198 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/7/2026TANYT&leg2=from:PSS,to:ORD,departure:5/14/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1197.37&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgojLCMAzDGsYwDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYokLKMAzDUtowDOFRAAVgBCiEIwaQBEgQxNzY4GIB5IM-UASiBvIwDMOW8jAM4RUABWAEKZQohCMGkARIEMTc2NRjPlAEggHkolf2MAzD5_YwDOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgooICNAzCChY0DOFRAAVgBCh8I1YIBEgM3ODcYiDggrhwo-IyNAzCZjo0DOFRAAVgBEgoIARABGAEqAlVBGAEiBAgBEAEoBDAB) ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Wed, May 6 - Mon, May 18 ORD Chicago PSS Posadas $1,200 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/6/2026TANYT&leg2=from:PSS,to:ORD,departure:5/18/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1199.93&airProductToken=AQplCh8IwawBEgMyNjMYrhwgwTMopKiMAzCWq4wDOFBAAFgBCh8IwawBEgMxNTUYwTMggHkox7KMAzDItYwDOFBAAVgBCiEIwaQBEgQxNzYyGIB5IM-UASjjtowDMMe3jAM4VEABWAEKZAohCMGkARIEMTc2ORjPlAEggHkoza2NAzCxro0DOFRAAFgBCh4IwawBEgI4OBikJiDBMyiCso0DMP60jQM4UEABWAEKHwjBrAESAzI2MhjBMyCuHCjGto0DMMy5jQM4UEABWAESCggBEAEYASoCQVYYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, May 6 - Thu, May 14 ORD Chicago PSS Posadas $1,209 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/6/2026TANYT&leg2=from:PSS,to:ORD,departure:5/14/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1208.21&airProductToken=AQpmCiAI1YIBEgQxMDE1GK4cIIg4KIGojAMwuamMAzhUQABYAQofCNWCARIDODE5GIg4IKQmKJCyjAMw1LaMAzhUQAFYAQohCMGkARIEMTc2OBiAeSDPlAEogbyMAzDlvIwDOEVAAVgBCmUKIQjBpAESBDE3NjUYz5QBIIB5KJX9jAMw-f2MAzhFQABYAQofCNWCARIDODE4GKQmIIg4KKCAjQMwgoWNAzhUQAFYAQofCNWCARIDNzg3GIg4IK4cKPiMjQMwmY6NAzhUQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Tue, May 12 - Fri, May 15 ORD Chicago PSS Posadas $1,220 Roundtrip found 14 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/12/2026TANYT&leg2=from:PSS,to:ORD,departure:5/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1219.93&airProductToken=AQplCh8IwawBEgMyNjMYrhwgwTMo5OuMAzDW7owDOFBAAFgBCh8IwawBEgMxNTUYwTMggHkoh_aMAzCI-YwDOFBAAVgBCiEIwaQBEgQxNzYyGIB5IM-UASij-owDMIf7jAM4VEABWAEKZAohCMGkARIEMTc2ORjPlAEggHko7YuNAzDRjI0DOEVAAFgBCh4IwawBEgI4OBikJiDBMyiikI0DMJ6TjQM4T0ABWAEKHwjBrAESAzI2MhjBMyCuHCjmlI0DMOyXjQM4T0ABWAESCggBEAEYASoCQVYYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, May 8 - Tue, May 19 ORD Chicago PSS Posadas $1,227 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/8/2026TANYT&leg2=from:PSS,to:ORD,departure:5/19/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1226.53&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgorLuMAzDmvIwDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYosL2MAzD0wYwDOFRAAVgBCiEIwaQBEgQxNzY0GIB5IM-UASilxIwDMInFjAM4RUABWAEKZgohCMGkARIEMTc2ORjPlAEgpCYo7biNAzDRuY0DOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgo4MONAzDCyI0DOFRAAVgBCiAI1YIBEgQyMTgyGIg4IK4cKMjJjQMw-MqNAzhUQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Thu, Apr 2 - Thu, Apr 16 ORD Chicago PSS Posadas $1,237 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:4/2/2026TANYT&leg2=from:PSS,to:ORD,departure:4/16/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1236.53&airProductToken=AQpmCiAI1YIBEgQxMjMxGK4cIIg4KK6iiQMw6aOJAzhTQABYAQofCNWCARIDODE5GIg4IKQmKLCoiQMw9KyJAzhTQAFYAQohCMGkARIEMTc2NBiAeSDPlAEorLCJAzCQsYkDOEVAAVgBCmYKIQjBpAESBDE3NjUYz5QBIIB5KJXCigMw-cKKAzhFQABYAQofCNWCARIDODE4GKQmIIg4KKDFigMwgsqKAzhUQAFYAQogCNWCARIEMjE4MhiIOCCuHCiEy4oDMKnMigM4VEABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Thu, May 7 - Fri, May 15 ORD Chicago PSS Posadas $1,238 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/7/2026TANYT&leg2=from:PSS,to:ORD,departure:5/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1237.80&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgojLCMAzDGsYwDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYokLKMAzDUtowDOFRAAVgBCiEIwaQBEgQxNzY4GIB5IM-UASiBvIwDMOW8jAM4RUABWAEKZgohCMGkARIEMTc2MxjPlAEggHkoz4aNAzCzh40DOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgowIuNAzCikI0DOFRAAVgBCiAI1YIBEgQyMTk3GIg4IK4cKNGWjQMw_JeNAzhUQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Thu, May 7 - Sat, May 16 ORD Chicago PSS Posadas $1,248 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/7/2026TANYT&leg2=from:PSS,to:ORD,departure:5/16/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1247.91&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgojLCMAzDGsYwDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYokLKMAzDUtowDOFRAAVgBCiEIwaQBEgQxNzY4GIB5IM-UASiBvIwDMOW8jAM4RUABWAEKZgohCMGkARIEMTc2MRjPlAEggHkov5KNAzCjk40DOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgo4JaNAzDCm40DOFNAAVgBCiAI1YIBEgQxMzM4GIg4IK4cKOGjjQMwg6WNAzhTQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, May 6 - Fri, May 15 ORD Chicago PSS Posadas $1,249 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/6/2026TANYT&leg2=from:PSS,to:ORD,departure:5/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1248.64&airProductToken=AQpmCiAI1YIBEgQxMDE1GK4cIIg4KIGojAMwuamMAzhUQABYAQofCNWCARIDODE5GIg4IKQmKJCyjAMw1LaMAzhUQAFYAQohCMGkARIEMTc2OBiAeSDPlAEogbyMAzDlvIwDOEVAAVgBCmYKIQjBpAESBDE3NjMYz5QBIIB5KM-GjQMws4eNAzhFQABYAQofCNWCARIDODE4GKQmIIg4KMCLjQMwopCNAzhUQAFYAQogCNWCARIEMjE5NxiIOCCuHCjRlo0DMPyXjQM4VEABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Mon, May 11 - Fri, May 15 ORD Chicago PSS Posadas $1,250 Roundtrip found 14 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/11/2026TANYT&leg2=from:PSS,to:ORD,departure:5/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1249.93&airProductToken=AQplCh8IwawBEgMyNjMYrhwgwTMoxOCMAzC244wDOFBAAFgBCh8IwawBEgMxNTUYwTMggHko5-qMAzDo7YwDOE9AAVgBCiEIwaQBEgQxNzY4GIB5IM-UASir9IwDMI_1jAM4UUABWAEKZAohCMGkARIEMTc2ORjPlAEggHko7YuNAzDRjI0DOEVAAFgBCh4IwawBEgI4OBikJiDBMyiikI0DMJ6TjQM4T0ABWAEKHwjBrAESAzI2MhjBMyCuHCjmlI0DMOyXjQM4T0ABWAESCggBEAEYASoCQVYYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, May 6 - Sat, May 16 ORD Chicago PSS Posadas $1,259 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/6/2026TANYT&leg2=from:PSS,to:ORD,departure:5/16/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1258.75&airProductToken=AQpmCiAI1YIBEgQxMDE1GK4cIIg4KIGojAMwuamMAzhUQABYAQofCNWCARIDODE5GIg4IKQmKJCyjAMw1LaMAzhUQAFYAQohCMGkARIEMTc2OBiAeSDPlAEogbyMAzDlvIwDOEVAAVgBCmYKIQjBpAESBDE3NjEYz5QBIIB5KL-SjQMwo5ONAzhFQABYAQofCNWCARIDODE4GKQmIIg4KOCWjQMwwpuNAzhTQAFYAQogCNWCARIEMTMzOBiIOCCuHCjho40DMIOljQM4U0ABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Tue, May 12 - Fri, May 15 ORD Chicago PSS Posadas $1,260 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/12/2026TANYT&leg2=from:PSS,to:ORD,departure:5/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1259.93&airProductToken=AQplCh8IwawBEgMyNjMYrhwgwTMo5OuMAzDW7owDOFBAAFgBCh8IwawBEgMxNTUYwTMggHkoh_aMAzCI-YwDOFBAAVgBCiEIwaQBEgQxNzY0GIB5IM-UASiJ_IwDMO38jAM4VEABWAEKZAohCMGkARIEMTc2ORjPlAEggHko7YuNAzDRjI0DOEVAAFgBCh4IwawBEgI4OBikJiDBMyiikI0DMJ6TjQM4T0ABWAEKHwjBrAESAzI2MhjBMyCuHCjmlI0DMOyXjQM4T0ABWAESCggBEAEYASoCQVYYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, May 15 - Fri, May 22 ORD Chicago PSS Posadas $1,267 Roundtrip found 14 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/15/2026TANYT&leg2=from:PSS,to:ORD,departure:5/22/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1266.53&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgojIqNAzDGi40DOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYokIyNAzDUkI0DOFRAAVgBCiEIwaQBEgQxNzY0GIB5IM-UASiFk40DMOmTjQM4RUABWAEKZgohCMGkARIEMTc2MxjPlAEggHkor9WNAzCT1o0DOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgooNqNAzCC340DOFRAAVgBCiAI1YIBEgQyMTgyGIg4IK4cKIjgjQMwuOGNAzhUQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Sat, Apr 11 - Mon, Apr 20 ORD Chicago PSS Posadas $1,277 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:4/11/2026TANYT&leg2=from:PSS,to:ORD,departure:4/20/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1276.53&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgoz4uKAzCJjYoDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYo0I2KAzCUkooDOFRAAVgBCiEIwaQBEgQxNzY4GIB5IM-UASj2looDMNqXigM4RUABWAEKZgohCMGkARIEMTc2ORjPlAEggHkozfKKAzCx84oDOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgowP2KAzCigosDOFNAAVgBCiAI1YIBEgQyMTgyGIg4IK4cKKSDiwMwyYSLAzhTQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, May 8 - Fri, May 15 ORD Chicago PSS Posadas $1,278 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:5/8/2026TANYT&leg2=from:PSS,to:ORD,departure:5/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1277.80&airProductToken=AQplCh8I1YIBEgM3MTQYrhwgiDgorLuMAzDmvIwDOFRAAFgBCh8I1YIBEgM4MTkYiDggpCYosL2MAzD0wYwDOFRAAVgBCiEIwaQBEgQxNzY0GIB5IM-UASilxIwDMInFjAM4RUABWAEKZgohCMGkARIEMTc2MxjPlAEggHkoz4aNAzCzh40DOEVAAFgBCh8I1YIBEgM4MTgYpCYgiDgowIuNAzCikI0DOFRAAVgBCiAI1YIBEgQyMTk3GIg4IK4cKNGWjQMw_JeNAzhUQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) ![avianca](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/av.gif) Wed, Apr 15 - Mon, Apr 27 ORD Chicago PSS Posadas $1,280 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:4/15/2026TANYT&leg2=from:PSS,to:ORD,departure:4/27/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1279.93&airProductToken=AQplCh8IwawBEgMyNjMYrhwgwTMohLyKAzD2vooDOE9AAFgBCh8IwawBEgMxNTUYwTMggHkop8aKAzCoyYoDOE9AAVgBCiEIwaQBEgQxNzYyGIB5IM-UASjDyooDMKfLigM4RUABWAEKZQohCMGkARIEMTc2ORjPlAEggHkorcGLAzCRwosDOFRAAFgBCh8IwawBEgMxNTQYgHkgwTMo2MWLAzDeyIsDOE9AAVgBCh8IwawBEgMyNjIYwTMgrhwopsqLAzCszYsDOE9AAVgBEgoIARABGAEqAkFWGAEiBAgBEAEoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Apr 10 - Mon, Apr 20 ORD Chicago PSS Posadas $1,288 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ORD,to:PSS,departure:4/10/2026TANYT&leg2=from:PSS,to:ORD,departure:4/20/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1287.80&airProductToken=AQpmCiAI1YIBEgQxOTA3GK4cIIg4KMGDigMw-ISKAzhUQABYAQofCNWCARIDODE5GIg4IKQmKNCNigMwlJKKAzhUQAFYAQohCMGkARIEMTc2OBiAeSDPlAEo9paKAzDal4oDOEVAAVgBCmYKIQjBpAESBDE3NjkYz5QBIIB5KM3yigMwsfOKAzhFQABYAQofCNWCARIDODE4GKQmIIg4KMD9igMwooKLAzhTQAFYAQogCNWCARIEMjE4MhiIOCCuHCikg4sDMMmEiwM4U0ABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![](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_) ## Alternative airports near Posadas Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:ORD,departure:3/24/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) PSS Libertador General Jose de San Martin CheapestClosest 12 min [Flights from $1,435 ](https://www.expedia.com/Flights-Search?leg1=from:ORD,to:PSS,departure:3/9/2026TANYT&leg2=from:PSS,to:ORD,departure:3/24/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Travel information | Origin airport | O'Hare Intl. | | ------------------- | ------------------------------------- | | Destination airport | Libertador General Jose de San Martin | | Roundtrip price | $1,160 | | Distance | 5207 mi | ## Book with confidence # Chicago to Posadas Flights The cheapest times to fly from Chicago to Posadas 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 Chicago to Posadas are during the month of May. You can find some of the cheapest flights from Chicago to Posadas with Expedia's search tool and vast selection of airlines. The best time to book a flight from Chicago to Posadas Sunday is one of the best days to book for cheap flights from Chicago to Posadas: 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 Chicago to Posadas 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 Chicago to Posadas 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 Chicago to Posadas 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 Chicago to Posadas 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. \*Available to One Key members.