Cheap Flights from Seattle/Tacoma Airport to Washington Dulles Airport

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

An average nonstop flight takes 4h 52m, covering a distance of 2300 miles.

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

There are 92 (nonstop) flights between Seattle/Tacoma Airport and Washington Dulles Airport per week, averaging 13 per day.

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

In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($257), Delta ($261) and Aeroflot ($288).

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

Alaska Airlines (3 times daily), Japan Airlines (2 times daily) are the most frequent flyers on this route.

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

For Seattle/Tacoma Airport to Washington Dulles Airport, Wednesday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Washington Dulles Airport back to Seattle/Tacoma Airport, the best deals are generally found on Tuesday, with Thursday being the most expensive.

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)?

Currently, KAYAK has observed decreased prices for several flights because of COVID-19. Unnecessary travel is not recommended at this time, and flights may be at risk of cancellation: please refer to local authorities in both Seattle/Tacoma Airport and Washington Dulles Airport for any travel warnings, and please check the airline's cancellation policy and travel advisories before booking your trip. For more advice, please view our information page on what to know about coronavirus (COVID-19) and travel.

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

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

Airports

Origin

Destination

Multiple Airlines

Wed, Aug 12

4h 58m

Tue, Aug 18

5h 54m

$257

Trip: 7 days

Based on null reviews

Delta

Fri, Jul 31

8h 44m

Sat, Aug 8

5h 35m

$261

Trip: 9 days

Based on null reviews

Aeroflot

Sat, Aug 22

5h 06m

Mon, Aug 31

7h 50m

$288

Trip: 10 days

Based on null reviews

Cathay Pacific

Sat, Aug 22

7h 33m

Mon, Aug 31

8h 17m

$290

Trip: 10 days

Based on null reviews

Qantas Airways

Sat, Aug 22

7h 55m

Mon, Aug 31

8h 22m

$293

Trip: 10 days

Based on null reviews

Multiple Airlines

Wed, Jul 15

7h 10m

Wed, Jul 22

5h 31m

$260

Trip: 8 days

Based on null reviews

Delta

Tue, Jul 14

8h 28m

Wed, Jul 22

9h 58m

$266

Trip: 9 days

Based on null reviews

Multiple Airlines

Tue, Oct 13

4h 55m

Wed, Jan 20

5h 31m

$262

Trip: 100 days

Based on null reviews

Delta

Wed, Jul 8

8h 28m

Tue, Jul 14

9h 58m

$276

Trip: 7 days

Based on null reviews

Multiple Airlines

Tue, Aug 25

7h 02m

Mon, Aug 31

7h 10m

$263

Trip: 7 days

Based on null reviews

Delta

Wed, Aug 26

4h 57m

Mon, Aug 31

5h 38m

$277

Trip: 6 days

Based on null reviews

Multiple Airlines

Mon, Jul 20

9h 42m

Sat, Jul 25

10h 03m

$264

Trip: 6 days

Based on null reviews

Delta

Fri, Jul 24

8h 28m

Sun, Aug 2

5h 38m

$281

Trip: 10 days

Based on null reviews

Multiple Airlines

Mon, Oct 12

7h 02m

Tue, Jan 19

5h 54m

$265

Trip: 100 days

Based on null reviews

Delta

Thu, Jul 9

8h 28m

Tue, Jul 14

7h 46m

$286

Trip: 6 days

Based on null reviews

Multiple Airlines

Thu, Jul 9

5h 12m

Tue, Jul 14

5h 31m

$267

Trip: 6 days

Based on null reviews

Delta

Wed, Oct 14

4h 55m

Thu, Jan 21

6h 00m

$292

Trip: 100 days

Based on null reviews

Multiple Airlines

Thu, Jul 9

4h 52m

Wed, Jul 15

7h 54m

$270

Trip: 7 days

Based on null reviews

Delta

Tue, Jul 28

8h 46m

Thu, Aug 6

5h 55m

$296

Trip: 10 days

Based on null reviews

Multiple Airlines

Fri, Jul 3

8h 28m

Sat, Jul 11

5h 31m

$271

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

Destination

Delta

Tue, Aug 18

5h 06m

$129

Based on null reviews

Delta

Tue, Jul 14

8h 28m

$133

Based on null reviews

Delta

Mon, Aug 3

5h 02m

$139

Based on null reviews

Multiple Airlines

Tue, Aug 18

14h 10m

$321

Based on null reviews

Delta

Thu, Jul 9

8h 46m

$143

Based on null reviews

Delta

Wed, Jul 8

6h 21m

$148

Based on null reviews

Delta

Sun, Aug 2

5h 06m

$149

Based on null reviews

Delta

Thu, Jul 16

8h 46m

$153

Based on null reviews

Delta

Sat, Jul 11

8h 46m

$178

Based on null reviews

Delta

Fri, Jul 3

9h 42m

$183

Based on null reviews

Multiple Airlines

Sun, Sep 13

13h 49m

$434

Based on null reviews

Delta

Thu, Jul 23

6h 21m

$203

Based on null reviews

Delta

Thu, Jul 2

9h 42m

$204

Based on null reviews

Multiple Airlines

Fri, Aug 14

22h 15m

$456

Based on null reviews

Multiple Airlines

Fri, Aug 21

22h 07m

$457

Based on null reviews

Delta

Wed, Jul 15

6h 21m

$233

Based on null reviews

Multiple Airlines

Fri, Aug 21

22h 07m

$481

Based on null reviews

Delta

Fri, Jun 26

9h 43m

$238

Based on null reviews

Multiple Airlines

Sun, Aug 2

11h 53m

$530

Based on null reviews

Delta

Thu, Jun 25

9h 43m

$252

Based on null reviews

Show more results

Seattle/Tacoma Airport - Washington Dulles Airport Flights

Departure:

Seattle/Tacoma Airport (SEA) United States

Destination:

Washington Dulles Airport (IAD) United States

Return flight deals:

Washington Dulles Airport - Seattle/Tacoma Airport

Cabin classes:

First

Business

Prem Econ

Economy

Browse origins:

$268

Seattle/Tacoma Airport

Browse destinations:

$268

Washington Dulles Airport

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.

We compile tonnes of data for you
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 email and someone from our team will get back to you promptly.

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.

SEA - IAD

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

Good to know

Low season

High season

Average price of a round-trip

Good deal for a round-trip

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

Top tips for finding a cheap flight

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

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

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

Seattle/Tacoma Airport - Washington Dulles Airport Flights

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