$146 Cheap Delta flights Washington (IAD) to Kalispell (FCA)

Finding cheap one-way Delta Air Lines flights from IAD to FCA from $146 on Expedia is a cinch — just filter by "Price (lowest to highest)." Or check out our budget-friendly return fares from $291 for your next adventure.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Begin your search one to three months ahead of your travel date to get cheap fares on Delta Air Lines flights from Washington Dulles Intl. Airport (IAD) to Glacier Park Intl. Airport (FCA). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Find Delta Air Lines's earliest flights from IAD to FCA by using our "Early Morning" and "Morning" filters. Not only will you arrive sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.

Offering an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is the leading choice for many travelers flying from IAD to FCA. Plus, if you're a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be spent on future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.