$146 Cheap Delta flights Washington (IAD) to Houston (HOU)

Landing cheap one-way Delta Air Lines flights from IAD to HOU from $146 on Expedia is a breeze — 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 before your departure to score cheap fares on Delta Air Lines flights from Washington Dulles Intl. Airport (IAD) to William P. Hobby Airport (HOU). 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 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 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 HOU by using the "Morning" and "Early Morning" filters. Not only will you get to your destination sooner, early departures are also 20% less likely to be canceled.**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.

Delta Air Lines makes traveling from IAD to HOU more enjoyable with a rewarding loyalty program and an excellent in-flight experience. You also have the chance to earn points with Delta SkyMiles. Remember to join our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.