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*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days
IAD - SEA
Find cheap flights from Washington Dulles Airport to Seattle/Tacoma Airport
Round-trip
Economy
Search hundreds of travel sites at once for deals on flights to Seattle/Tacoma Airport
Good to know
Low season |
January | Best time to beat the crowds with an average 26% drop in price. |
|---|---|---|
High season |
July | Most popular time to fly with an average 20% increase in price. |
Average price of a round-trip |
$329 | (avg. price over the last 2 weeks) |
Good deal for a round-trip |
$316 | or less |
When to book flights from Washington Dulles Intl to Seattle/Tacoma 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 $201 or less.
- The cheapest flight from Washington Dulles Airport to Seattle/Tacoma Airport was found 72 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 20% cheaper than an evening flight, on average*.
FAQs for booking Washington Dulles Airport to Seattle/Tacoma Airport flights
Which airlines have a flexible cancellation policy for flights from Washington Dulles Intl to Seattle/Tacoma Intl due to COVID-19?
Which airlines apply social distancing measures on flights from Washington Dulles Intl to Seattle/Tacoma Intl due to COVID-19?
Are there Seattle/Tacoma Airport travel restrictions currently due to Coronavirus?
How long does a flight from Washington Dulles Airport to Seattle/Tacoma Airport take?
How many flights are there between Washington Dulles Airport and Seattle/Tacoma Airport?
Which airlines provide the cheapest flights from Washington Dulles Airport to Seattle/Tacoma Airport?
Do I need a passport to fly between Washington Dulles Airport and Seattle/Tacoma Airport?
Which airlines fly most frequently between Washington Dulles Airport and Seattle/Tacoma Airport?
What’s the cheapest day of the week to fly Washington Dulles Airport to Seattle/Tacoma Airport?
How does KAYAK find such low prices on flights from Washington Dulles Airport to Seattle/Tacoma Airport?
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to Seattle/Tacoma Airport?
What is the Hacker Fare option on flights from Washington Dulles Airport to Seattle/Tacoma Airport?
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to Seattle/Tacoma Airport?
Top airline flying Washington Dulles Intl to Seattle/Tacoma Intl
Scores according to KAYAK customer reviews
7.9
Delta
Overall score based on 28,662 reviews
8.1
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
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Washington Dulles Airport - Seattle/Tacoma Airport Flights
Departure:
Washington Dulles Airport (IAD) United States
Destination:
Seattle/Tacoma Airport (SEA) United States
Return flight deals:
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*
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.
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.
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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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