$154 Cheap United flights Washington (IAD) to Tucson (TUS)

Scoring cheap one-way United Airlines flights from IAD to TUS from $154 on Expedia is easy — just filter by “Price (lowest to highest).” Alternatively, check out our budget-friendly round-trip fares from $307 for your next break.**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.

United Airlines flights to Tucson are typically cheaper in the off-peak months of June and July. Whether you need a round-trip or one-way ticket, you could score a better deal then.

Start searching one to three months ahead of your travel date to get cheap fares on United Airlines flights from Washington Dulles Intl. Airport (IAD) to Tucson Intl. Airport (TUS). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut 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 journeys.*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.

To find out if there’s a direct route from IAD to TUS with United Airlines or another airline, select the “Nonstop” filter when looking for flights.

Filter your results by “Early Morning” and “Morning” to find the earliest departures from IAD to TUS. Taking off early means you’re 20% less likely to experience 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.

United Airlines flights from Washington Dulles Intl. Airport (IAD) to Tucson land at Tucson Intl. Airport (TUS). This is the main gateway here.

A rewarding loyalty program and the opportunity to collect points through United Mileage Plus are the start of the reasons to fly from IAD to TUS with United Airlines. Plus, when you join Expedia’s free One Key™ program, you can receive OneKeyCash™* on top of United Airlines’s loyalty program earnings. It’s yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are typically free within 24 hours of booking, but your airline may charge a fee after that time. For more information about altering your reservation, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to change your plans without additional charges, tick the “No cancel fee” or “Changes included” filter when planning your next adventure.