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Flights Fare Calendar Find minimum fare between Seattle - Tacoma Intl. and Washington Dulles Intl. Click this button to get previous days data Click this button to get next days data $647 $555 $462 $370 $277 $185 $92 $0 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W Price is $286 on Delta Price is $286 on Delta Price is $277 on United Price is $299 on Southwest Airlines Price is $371 on Southwest Airlines Price is $458 on Southwest Airlines Price is $341 on Southwest Airlines Price is $436 on Delta Price is $352 on Southwest Airlines Price is $372 on Southwest Airlines Price is $398 on Southwest Airlines Price is $647 on Alaska Airlines Price is $342 on Southwest Airlines Price is $448 on Southwest Airlines Price is $530 on United Price is $606 on Alaska Airlines Price is $577 on United Price is $476 on United Price is $342 on Southwest Airlines Price is $346 on Southwest Airlines Price is $432 on Southwest Airlines Price is $470 on Alaska Airlines Price is $502 on Alaska Airlines Price is $316 on United Price is $246 on United Price is $365 on Southwest Airlines Price is $432 on Southwest Airlines Price is $365 on Southwest Airlines Price is $383 on United Price is $346 on United

Amazing SEA to IAD Flight Deals

The cheapest flights to Washington Dulles Intl. found within the past 7 days were $189 round trip and $99 one way. Prices and availability subject to change. Additional terms may apply.

Flight Schedule for SEA to IAD

Carrier Flight Depart SEA Arrive IAD Tue
6/15
Wed
6/16
Thu
6/17
Fri
6/18
Sat
6/19
Sun
6/20
Mon
6/21
Stops
UA 1631 08:15 am 04:10 pm Check fare Check fare Check fare Check fare Check fare Check fare Check fare 0 stop(s)
AS 1078 08:25 am 04:40 pm Check fare Check fare Check fare Check fare Check fare Check fare Check fare 0 stop(s)
DL 1584 10:05 am 06:04 pm Check fare Check fare Check fare Check fare Check fare Check fare Check fare 0 stop(s)
AS 1188 03:50 pm 11:56 pm - Check fare - - - - - 0 stop(s)
AS 1095 09:43 pm 05:45 am - - Check fare Check fare Check fare Check fare Check fare 0 stop(s)

FAQs about flights from Seattle - Tacoma Intl. Airport (SEA) to Washington Dulles Intl. Airport (IAD)

Can I catch a flight from Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) to Washington, DC Airport (IAD-Washington Dulles Intl.) right now?

It's wise to learn about any travel advice reports and quarantine requirements in effect in your destination city. Make sure you go to our Covid-19 Travel Advisor for up-to-date info on catching a flight to Washington, DC Airport (IAD-Washington Dulles Intl.) from Seattle, WA Airport (SEA-Seattle - Tacoma Intl.).

Are there direct flights from Seattle - Tacoma Intl. Airport (SEA) to Washington Dulles Intl. Airport (IAD)?

If you'd love to get from Seattle - Tacoma Intl. Airport (SEA) to Washington Dulles Intl. Airport (IAD) as speedily as possible, you'll be pleased to know multiple airlines offer nonstop flights. Pick your favorite seat with Alaska Airlines or Alaska Airlines.

If I am not able to travel due to COVID-19, can I change my booking to a later date?

For more info about changing your flight to IAD, please visit our Customer Service Portal.

How long is the flight from Sea-Tac Airport to Dulles Intl. Airport?

Flights between SEA and Dulles Intl. Airport usually take around 4 hours and 52 minutes in total. Make the most of that time in the air by reading, napping, exploring the in-flight entertainment or doing all three.

What is the flight distance from Seattle - Tacoma Intl. Airport (SEA) to IAD?

The flight distance from Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) to Washington Dulles Intl. Airport (IAD) is 2,299 mi. Don't forget to bring some reading material or a few crosswords to make your journey fly by.

What airlines fly from Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) to Washington, DC Airport (IAD-Washington Dulles Intl.)?

If you're planning a trip from Seattle to Washington, you're spoiled for choice. Take your pick from these favorite airlines advertising direct flights from Sea-Tac Airport to IAD:

  • Delta - (DL) with 115 flights every month
  • Alaska Airlines - (AS) with 160 flights every month
  • United Airlines - (UA) with 160 flights every month
  • United Airlines - (UA with 160 flights every month
  • Alaska Airlines - (AS) with 160 flights every month
  • Alaska Airlines - (AS) with 160 flights every month
What is the best day to buy a plane ticket?

This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2020. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Sunday, as data shows the end of the week is when prices are generally at their highest.

What are the cheapest days to fly?

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2020, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

How far in advance can you book a flight?

Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2020 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2 weeks to 2 months prior to their travel dates.

How can I save money on airline tickets?

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2020 saved nearly 40% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2020. Savings are subject to change based on departure location, date and destination.

Seattle - Tacoma Intl. to Washington Dulles Intl. Flight FAQ

Traveling FromSeattle - Tacoma Intl.
Traveling ToWashington Dulles Intl.
Shortest Flight Time10 hours 55 mins
Earliest Departure Time8:15AM EDT
Latest Departure Time9:43PM EDT
Lowest Flight Price$189

Route Info

Flight path for flights from Seattle-Tacoma International Airport to Washington Dulles International Airport


Distance:
2,313.00 miles


Airlines & Aircraft Used on SEA to IAD Flight Routes


Airline Carrier
Aircraft
Delta Air Lines
Canadair Regional Jet 700

Popular Flight Routes from Seattle (SEA)

Seattle - Tacoma Intl. to Washington Dulles Intl. Flight FAQ

Traveling FromSeattle - Tacoma Intl.
Traveling ToWashington Dulles Intl.
Shortest Flight Time10 hours 55 mins
Earliest Departure Time8:15AM EDT
Latest Departure Time9:43PM EDT
Lowest Flight Price$189

Popular Flight Routes from Washington (IAD)

Travelers at IAD love to visit these top cities. Roam to the top destinations from Washington(IAD) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.