$129 Cheap Delta flights Seattle (SEA) to Washington (IAD)

Finding cheap one-way Delta Air Lines flights from SEA to IAD from $129 on Expedia is easy — just filter by “Price (lowest to highest).” Or check out our budget-friendly round-trip fares from $257 for your next getaway.**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.

January is one of the cheapest months to get away to Washington with Delta Air Lines. You could also find fantastic deals on return and one-way fares in February.

For cheap Delta Air Lines fares from Seattle - Tacoma Intl. Airport (SEA) to Washington Dulles Intl. Airport (IAD), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence the overall price. Sunday is generally the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**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.

Delta Air Lines has direct flights from Seattle - Tacoma Intl. Airport (SEA) to Washington Dulles Intl. Airport (IAD), with 7 departures every week. Simply choose the “Nonstop” and “Airline” filters during your search on Expedia to find all direct Delta Air Lines flights to IAD.

Leave Seattle - Tacoma Intl. Airport (SEA) for Washington Dulles Intl. Airport (IAD) on a direct Delta Air Lines flight, and you’ll be in the air for approximately 5h.

The earliest Delta Air Lines flight from SEA to IAD takes off at 7:10AM UTC-8, arriving at 3:10PM UTC-5. If you want to set off later, the last Delta Air Lines flight leaves SEA at 7:10AM UTC-8 and touches down at IAD at 3:10PM UTC-5. Flying early is often a wise choice as morning and mid-morning flights are least 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.

Delta Air Lines flights from Seattle - Tacoma Intl. Airport (SEA) to Washington touch down at Washington Dulles Intl. Airport (IAD), Ronald Reagan Washington National Airport (DCA) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI). The main Washington gateway serviced by this carrier is IAD. It’s worth considering flights landing at other nearby airports on Expedia as you may find cheaper tickets.

Delta Air Lines makes traveling from SEA to IAD more comfortable with a rewarding loyalty program and an excellent in-flight experience. You may even earn points with Delta SkyMiles. Remember to join Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Delta Air Lines typically uses Airbus A220-300 planes for flights from Seattle - Tacoma Intl. Airport (SEA) to Washington Dulles Intl. Airport (IAD). Bear in mind that aircraft type can differ depending on operational demands, so the plane you catch might be different on the day.

Typically, you can change or cancel your flight, although additional fees may apply if you booked over 24 hours ago. Prefer to keep your options open? Use our “No cancel fee” and “Changes included” filters to find flights that won’t charge extra if you need to alter your plans. To modify your itinerary, visit “Trips,” select your flight and click on “Manage Booking” for more details.