Title: $104 Cheap flights from Roundup, MT - Expedia.com ![](https://a.travel-assets.com/travel-assets-manager/fallback-images-brand/bex_flights_v2.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # $104 Cheap flights from Roundup, MT [View $104 flight on Wed, May 13, 2026](https://expedia.com/Flights-Search?trip=oneway&leg1=from:BIL,to:PDX,departure:5/13/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:103.20&airProductToken=AQpxCjYI1YIBEgQ0NzU4GIFaIINpKPf0jAMw7fWMAzhOQABYAWoKMV9iYXNpY2Vjb3IIS0FLMkFRQlMKNwjVggESBDE3NzAYg2kg77gBKLn2jAMw4veMAzhOQABYAWoKMV9iYXNpY2Vjb3IIS0FLMkFRQlMSCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL) [Roundup Travel Guide](https://expedia.com/Roundup.dx183525)[Hotels in Roundup](https://expedia.com/Roundup-Hotels.d183525.Travel-Guide-Hotels)[Car Rentals in Roundup](https://expedia.com/Car-Rentals-In-Roundup.d183525.Car-Rental-Guide)[Roundup Vacation Packages](https://expedia.com/Roundup.d183525.Destination-Travel-Guides) ## Popular airlines from Roundup - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LH.svg) Lufthansa - ![](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) ## Cheapest flights from Roundup These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Apr 11 - Tue, Apr 14 BIL Billings PDX Portland $197 Roundtrip found 1 day ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:PDX,departure:4/11/2026TANYT&leg2=from:PDX,to:BIL,departure:4/14/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:196.80&airProductToken=AQo0CjIIwaYBEgQyMTgxGIFaIO-4ASi6iooDMLmLigM4WEAAWAFqBVNBVkVScghPSDJFWFVCTgo0CjIIwaYBEgQyMTYxGO-4ASCBWijaq4oDMM2sigM4WEAAWAFqBVNBVkVScghPSDJFWFVCThIKCAEQARgBKgJBUxgBIgQIARABKAIoAygEMA0) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Apr 11 - Wed, Apr 15 BIL Billings SEA Seattle $197 Roundtrip found 1 day ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:SEA,departure:4/11/2026TANYT&leg2=from:SEA,to:BIL,departure:4/15/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:196.80&airProductToken=AQozCjEIwaYBEgQyNDQ2GIFaIJIBKKSIigMwqomKAzhYQABYAWoFU0FWRVJyCE9IMkVYVUJOCjMKMQjBpgESBDI0NTcYkgEggVoo9LuKAzDmvIoDOFhAAFgBagVTQVZFUnIIT0gyRVhVQk4SDAgBEAEYASoCQVMyABgBIgQIARABKAIoAygEMA0) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Sat, Apr 25 - Tue, Apr 28 BIL Billings PDX Portland $207 Roundtrip found 14 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:PDX,departure:4/25/2026TANYT&leg2=from:PDX,to:BIL,departure:4/28/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:206.40&airProductToken=AQpvCjUI1YIBEgM0NzgYgVogg2ko86iLAzDjqYsDOE5AAFgBagoxX2Jhc2ljZWNvcghLQUsyQVFCUwo2CNWCARIDNDk4GINpIO-4ASiVq4sDML6siwM4TkAAWAFqCjFfYmFzaWNlY29yCEtBSzJBUUJTCm8KNgjVggESAzQ1ORjvuAEgg2ko0MaLAzDux4sDOE5AAFgBagoxX2Jhc2ljZWNvcghLQUsyQVFCUwo1CNWCARIDNzAzGINpIIFaKKnJiwMwi8qLAzhOQABYAWoKMV9iYXNpY2Vjb3IIS0FLMkFRQlMSCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Wed, Apr 15 - Wed, May 6 BIL Billings SEA Seattle $207 Roundtrip found 1 day ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:SEA,departure:4/15/2026TANYT&leg2=from:SEA,to:BIL,departure:5/6/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:206.40&airProductToken=AQpECiAIxJgBEgQxMzYwGIFaIPISKIi0igMw37SKAzhFQABYAQogCMSYARIEMjg3NBjyEiCSASiftYoDMK-2igM4RUABWAEKRAogCMSYARIEMTE2NRiSASDyEiiIpowDMISnjAM4RUAAWAEKIAjEmAESBDEzNDAY8hIggVoo2aeMAzCoqIwDOEVAAVgBEgoIARABGAEqAkRMGAEiBAgBEAEoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Apr 29 - Sat, May 2 BIL Billings DEN Denver $249 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:DEN,departure:4/29/2026TANYT&leg2=from:DEN,to:BIL,departure:5/2/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:248.80&airProductToken=AQo3CjUI1YIBEgM0NzgYgVogg2ko89WLAzDj1osDOE5AAFgBagoxX2Jhc2ljZWNvcghMRkEyQURCTgo4CjYI1YIBEgQ1MjExGINpIIFaKMj0iwMwrPWLAzhOQABYAWoKMV9iYXNpY2Vjb3IITEZBMkFEQk4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAL) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Apr 18 - Tue, Apr 21 BIL Billings LAX Los Angeles $283 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:LAX,departure:4/18/2026TANYT&leg2=from:LAX,to:BIL,departure:4/21/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:282.40&airProductToken=AQpnCjEIwaYBEgQyNDQ2GIFaIJIBKITXigMwitiKAzhYQABYAWoFU0FWRVJyCE9IMkVYVUJOCjIIwaYBEgQxMzkwGJIBIIu4ASjf3YoDMIPfigM4WEABWAFqBVNBVkVScghHSDJFWFVCTgpmCjEIwaYBEgM1MjcYi7gBIJIBKKT5igMw2vqKAzhYQABYAWoFU0FWRVJyCEdIMkVYVUJOCjEIwaYBEgQyNDU3GJIBIIFaKLT_igMwpoCLAzhYQAFYAWoFU0FWRVJyCE9IMkVYVUJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwDQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, Apr 7 - Wed, Apr 8 BIL Billings PHX Phoenix $285 Roundtrip found 3 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:PHX,departure:4/7/2026TANYT&leg2=from:PHX,to:BIL,departure:4/8/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:284.60&airProductToken=AQo0CjIIwYIBEgQzNDIxGIFaIO-5ASjz2okDMJXciQM4QkAAWAFqBUJBU0lDcghPVUFXS1NCWAppCjMIwYIBEgQxNjYzGO-5ASCjsQEot-qJAzDO64kDOEJAAFgBagVCQVNJQ3IIT1VBV0tTQlgKMgjBggESBDM5MzcYo7EBIIFaKIXsiQMwu-2JAzhCQAFYAWoFQkFTSUNyCE9VQVdLU0JYEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw) ![Bargain Flight](//images.trvl-media.com/media/content/expus/graphics/ebf-graphic.png) Mon, Oct 19 - Fri, Oct 23 BIL Billings LAS Las Vegas $297 Roundtrip found 1 day ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:LAS,departure:10/19/2026TANYT&leg2=from:LAS,to:BIL,departure:10/23/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:296.70) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Apr 22 - Sun, Apr 26 BIL Billings MCI Kansas City $329 Roundtrip found 11 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:MCI,departure:4/22/2026TANYT&leg2=from:MCI,to:BIL,departure:4/26/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:328.40&airProductToken=AQpvCjUI1YIBEgM0NzgYgVogg2kok4eLAzCDiIsDOE5AAFgBagoxX2Jhc2ljZWNvcghLRkEyQURCTgo2CNWCARIEMTY2ORiDaSDMQCjUiIsDML6JiwM4TkAAWAFqCjFfYmFzaWNlY29yCEtGQTJBREJOCnAKNgjVggESBDUyNTMYzEAgg2ko1K-LAzDRsIsDOE5AAFgBagoxX2Jhc2ljZWNvcghLRkEyQURCTgo2CNWCARIENDc2MhiDaSCBWiiIsYsDMOyxiwM4TkAAWAFqCjFfYmFzaWNlY29yCEtGQTJBREJOEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) ![Hawaiian Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/HA.gif) Sat, Apr 11 - Fri, Apr 17 BIL Billings PHX Phoenix $330 Roundtrip found 4 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BIL,to:PHX,departure:4/11/2026TANYT&leg2=from:PHX,to:BIL,departure:4/17/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:329.39&airProductToken=AQpHCiEIyIIBEgQ0Nzc1GIFaIO-4ASi6iooDMLmLigM4VUAAWAEKIgjIggESBDY0NjUY77gBIO-5ASjvi4oDMJGNigM4VUABWAEKRwoiCMiCARIENjQzNhjvuQEg77gBKN7RigMwi9OKAzhVQABYAQohCMiCARIENjMyMhjvuAEggVoo2tiKAzDN2YoDOFVAAVgBEgoIARABGAEqAkhBGAEiBAgBEAEoBDAB) ## How to Find Cheap Flights from Roundup, MT #### How much is a flight from Roundup? This week, flights from Roundup are available between $197 – $339\. #### How to find cheap flights from Roundup? Expedia makes it easy to compare cheap flights from Roundup to many destinations. Check out excellent deals on domestic and international flights from Roundup. Once you select an offer, use our filters and sort by “Price (Lowest)” to see some of the cheapest and suitable options. #### How can I get the best deal on flights from Roundup? On Expedia, you have some of best airline ticket deals at your fingertips. Whether it’s a beach escape with your partner, a family vacation with your kids, or business trip with colleagues, these low airline ticket prices mean more savings for you. An excellent strategy for finding some of the best deals on flights from Roundup is to be flexible with your dates. Within each offer, you can compare prices for similar timeframes using our “Show flexible dates” feature. Depending on your destination, direct flights from Roundup may be more expensive. Airlines with strict bag policies or fees can also impact your costs. #### What is the best airline to fly from Roundup? At Expedia, we give you all the available options from our reputable partners. Select the airline that best suits your preferences and membership loyalties. You can fly from Roundup with: United, Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Air Canada. #### What is the best month to fly from Roundup? One of the cheapest times to fly from Roundup airport(s) is April, based on the current list of flights available now. Prices on plane tickets vary considerably throughout the year due to availability and seasonal demand. #### Are there any last-minute flights from Roundup? Expedia is the place to find last-minute flights from Roundup, making it easy for you to compare prices on flights in the near future for different combinations of travel dates and from multiple airlines. We source some of the best deals for you and display some of the best offers available over the next 2 weeks. #### Why book your ticket with Expedia? Booking flights from Roundup with Expedia is the obvious choice to get low prices, save money, and see more value from every dollar spent. We show you some of the best deals happening right now and provide a vast inventory of airlines and flight routes to choose from, so you can find some of the cheapest flights from Roundup. You can customize your journey to your timeline, route preferences, budget, rewards programs, and more. #### Can I change/cancel my flight? Some flights can be changed or canceled, but fees and refunds will depend on the unique terms of your flight agreement. Airlines have different rules and restrictions for exchanging or refunding flights. For more information, go to your itinerary or visit our [customer service portal](https://www.expedia.com/service/). We recommend choosing flights with no change fees for the most flexibility. Filter by “Flexible change policies” to see flights with no change fees. \*Data specialists from both ARC and Expedia Group analysed ARC's global flight data to distil actionable information to help people save money on travel. While it's impossible to guarantee when to find the lowest prices, after examining the variables, we were able to observe trends. Analysis based on ARC, round-trip flight data between 1 October 2017 - 30 September 2018 for Economy and Premium cabin ATPs on a global basis. ## Travel information ## Flights from Roundup: Essential Travel Information | Cheapest flight from Roundup | $197 (roundtrip) | | ---------------------------------- | -------------------------------------------------------------------------------- | | Best airlines to fly from Roundup | United, Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Air Canada | | Cheapest month to fly from Roundup | April | | Roundup IATA code | BIL | | Roundup Country/State | Montana | | Airline ticket deals from Roundup | $197 - $339 | \*Flight schedules are subject to change. ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - Vacation Rentals - [Hotels near Roundup City Park ](https://www.expedia.com/Roundup-City-Park-Hotels.0-l553248621579082931-0.Travel-Guide-Filter-Hotels) - [Hotels near Pine Ridge Golf Club ](https://www.expedia.com/Pine-Ridge-Golf-Club-Hotels.0-l553248621579082933-0.Travel-Guide-Filter-Hotels) - 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