Find cheap flights from Seattle/Tacoma Airport to Washington Dulles Airport

SEA - IAD

Find cheap flights from Seattle/Tacoma Airport to Washington Dulles Airport

Round-trip
Economy
Seattle (SEA)
Washington Dulles Intl
Sat 7/11
Sat 7/18
Any month
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Good to know

Low season

January Best time to beat the crowds with an average 22% drop in price.

High season

July Most popular time to fly with an average 17% increase in price.

Average price of a round-trip

$330 (avg. price over the last 2 weeks)

Good deal for a round-trip

$309 or less

When to book flights from Seattle/Tacoma Intl to Washington Dulles Intl

Estimated round-trip price
Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $203 or less.
  • The cheapest flight from Seattle/Tacoma Airport to Washington Dulles Airport was found 44 days before departure, on average.
  • Book at least 3 weeks before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly is January.
  • Morning departure is around 4% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking Seattle/Tacoma Airport to Washington Dulles Airport flights

Are flight prices cheaper from Seattle/Tacoma Airport to Washington Dulles Airport because of Coronavirus (COVID-19)?

How long does a flight from Seattle/Tacoma Airport to Washington Dulles Airport take?

How many flights are there between Seattle/Tacoma Airport and Washington Dulles Airport?

Which airlines provide the cheapest flights from Seattle/Tacoma Airport to Washington Dulles Airport?

Do I need a passport to fly between Seattle/Tacoma Airport and Washington Dulles Airport?

Which airlines fly most frequently between Seattle/Tacoma Airport and Washington Dulles Airport?

What’s the cheapest day of the week to fly Seattle/Tacoma Airport to Washington Dulles Airport?

How does KAYAK’s flight Price Forecast tool help me choose the right time to buy?

Top 4 airlines serving Seattle/Tacoma Intl to Washington Dulles Intl

Scores according to KAYAK customer reviews

8.0
Delta
Overall score based on 28,441 reviews
8.2
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
Airline reviews
Read more about Delta

Book cheap flights from Seattle/Tacoma Airport to Washington Dulles Airport (round-trip)

Airports
Origin
Seattle
$257
only
$257
Destination
Washington
$257
only
$257
Wed, Aug 12
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
4h 58m
Tue, Aug 18
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 54m
Trip: 7 days
Based on null reviews
Fri, Jul 31
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 44m
Sat, Aug 8
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 35m
Trip: 9 days
Based on null reviews
Sat, Aug 22
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
5h 06m
Mon, Aug 31
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
7h 50m
Trip: 10 days
Based on null reviews
Sat, Aug 22
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
7h 33m
Mon, Aug 31
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
8h 17m
Trip: 10 days
Based on null reviews
Sat, Aug 22
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
7h 55m
Mon, Aug 31
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
8h 22m
Trip: 10 days
Based on null reviews
Wed, Jul 15
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
7h 10m
Wed, Jul 22
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 31m
Trip: 8 days
Based on null reviews
Tue, Jul 14
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 28m
Wed, Jul 22
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
9h 58m
Trip: 9 days
Based on null reviews
Tue, Oct 13
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
4h 55m
Wed, Jan 20
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 31m
Trip: 100 days
Based on null reviews
Wed, Jul 8
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 28m
Tue, Jul 14
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
9h 58m
Trip: 7 days
Based on null reviews
Tue, Aug 25
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
7h 02m
Mon, Aug 31
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
7h 10m
Trip: 7 days
Based on null reviews
Wed, Aug 26
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
4h 57m
Mon, Aug 31
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 38m
Trip: 6 days
Based on null reviews
Mon, Jul 20
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
9h 42m
Sat, Jul 25
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
10h 03m
Trip: 6 days
Based on null reviews
Fri, Jul 24
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 28m
Sun, Aug 2
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 38m
Trip: 10 days
Based on null reviews
Mon, Oct 12
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
7h 02m
Tue, Jan 19
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 54m
Trip: 100 days
Based on null reviews
Thu, Jul 9
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 28m
Tue, Jul 14
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
7h 46m
Trip: 6 days
Based on null reviews
Thu, Jul 9
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
5h 12m
Tue, Jul 14
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 31m
Trip: 6 days
Based on null reviews
Wed, Oct 14
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
4h 55m
Thu, Jan 21
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
6h 00m
Trip: 100 days
Based on null reviews
Thu, Jul 9
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
4h 52m
Wed, Jul 15
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
7h 54m
Trip: 7 days
Based on null reviews
Tue, Jul 28
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 46m
Thu, Aug 6
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 55m
Trip: 10 days
Based on null reviews
Fri, Jul 3
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 28m
Sat, Jul 11
IAD
Washington Dulles Airport
SEA
Seattle/Tacoma Airport
5h 31m
Trip: 9 days
Based on null reviews
Show more results

Book cheap flights from Seattle/Tacoma Airport to Washington Dulles Airport (one-way)

Airports
Origin
Seattle
$129
only
$129
Destination
Washington
$129
only
$129
Tue, Aug 18
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
5h 06m
Based on null reviews
Tue, Jul 14
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 28m
Based on null reviews
Mon, Aug 3
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
5h 02m
Based on null reviews
Tue, Aug 18
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
14h 10m
Based on null reviews
Thu, Jul 9
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 46m
Based on null reviews
Wed, Jul 8
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
6h 21m
Based on null reviews
Sun, Aug 2
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
5h 06m
Based on null reviews
Thu, Jul 16
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 46m
Based on null reviews
Sat, Jul 11
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
8h 46m
Based on null reviews
Fri, Jul 3
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
9h 42m
Based on null reviews
Sun, Sep 13
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
13h 49m
Based on null reviews
Thu, Jul 23
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
6h 21m
Based on null reviews
Thu, Jul 2
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
9h 42m
Based on null reviews
Fri, Aug 14
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
22h 15m
Based on null reviews
Fri, Aug 21
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
22h 07m
Based on null reviews
Wed, Jul 15
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
6h 21m
Based on null reviews
Fri, Aug 21
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
22h 07m
Based on null reviews
Fri, Jun 26
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
9h 43m
Based on null reviews
Sun, Aug 2
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
11h 53m
Based on null reviews
Thu, Jun 25
SEA
Seattle/Tacoma Airport
IAD
Washington Dulles Airport
9h 43m
Based on null reviews
Show more results
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.
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