Cheap flights from Washington, D.C. to Seattle from $66
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Seattle departing on 9/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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American Airlines flights from Washington, D.C. to Seattle
Our best American Airlines deals on Washington, D.C. to Seattle flight tickets
Frontier flights from Washington, D.C. to Seattle
Our best Frontier deals on Washington, D.C. to Seattle flight tickets
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How to get the cheapest flight ticket from Washington, D.C. to Seattle
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Washington, D.C. and Seattle?
What is the cheapest month to fly to Seattle?
In general, September is the cheapest month to fly from Washington, D.C. to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $337. If you don’t want to visit Seattle in September, then you should wait until October to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $366.
What is the cheapest day to depart on your flight to Seattle?
On average, the least expensive day to fly to Seattle from Washington, D.C. is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $441. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Washington, D.C. because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $574.
What is the cheapest time of day to depart on your flight to Seattle?
Flying to Seattle from Washington, D.C. in the evening is the least expensive time of day to depart. momondo users have found prices as low as $419 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $523. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.
What is the cheapest Washington, D.C. to Seattle/Tacoma Intl flight route?
Fly from Washington, D.C. Dulles Intl to Seattle/Tacoma Intl for the best Washington, D.C. - Seattle/Tacoma Intl flight prices
How far in advance should I book a flight to Seattle?
You are more likely to see cheaper flights to Seattle from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $413 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Washington, D.C. for as low as $362 on momondo.
What cabin class options are available on Washington, D.C. to Seattle/Tacoma Intl flights?
There are 4 cabin classes available to choose from on Washington, D.C. to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Washington, D.C. to Seattle flights?
You could potentially save up to 25% on your flight if you consider stops on a Washington, D.C. to Seattle flight.
How have Washington, D.C. to Seattle flight prices changed over time?
As of June 2025, prices for Washington, D.C. to Seattle flights are approximately 34% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Washington, D.C. to Seattle/Tacoma Intl?
Frontier and American Airlines are the most popular carriers operating from Washington, D.C. to Seattle/Tacoma Intl
What airlines fly to Seattle?
Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Seattle from Washington, D.C. according to our data. Alaska Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 9 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.
How many flights depart from Washington, D.C. to Seattle on average per day?
As of June 2025, 45 flights take off from Washington, D.C. and land in Seattle each day. The most common flight departure time for this route is 5:00PM, with 53% of daily flights taking off at noon.
How many flights depart from Washington, D.C. to Seattle on average per week?
As of June 2025, there are 318 flights per week flying from Washington, D.C. to Seattle. The most common day of the week flights depart is Fri, with 17% of flights taking off on this day.
When to book flights from Washington, D.C. to Seattle
Cheap Washington, D.C. to Seattle (WAS to SEA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Seattle
How far is Washington, D.C. to Seattle/Tacoma Intl by plane?
The straight-line distance from Washington, D.C. to Seattle/Tacoma Intl is 2320.5 mi. 5h 40m is a normal flight duration for this route.
When did momondo last update prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport?
Prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Washington, D.C. to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Washington, D.C. to Seattle/Tacoma Intl Airport is 9 as of June 2025.
How old do you have to be to fly from Washington, D.C. to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Washington, D.C. to Seattle?
momondo data reveals that the most frequently booked plane model on the route from Washington, D.C. to Seattle is Boeing 737 MAX 9, representing 22.22% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 21.27%, Boeing 737-900 Passenger/BBJ3 (winglets) at 15.55%, and Boeing 737 at 11.97%.
What is the most popular airline from Washington, D.C. to Seattle?
momondo data reveals that the most frequently booked airline on the route from Washington, D.C. to Seattle is Alaska Airlines, representing 44% of all bookings. The subsequent popular airlines are United Airlines at 24%, Delta at 20%, and Hawaiian Airlines at 4%.
Best airlines flying from Washington, D.C. to Seattle
Compare and see reviews for airlines that fly from Washington, D.C. to Seattle with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $111 | Free Cancellation | Rating 5.9 3,293 reviews | |||
| PriceFrom $125 | Free Cancellation | Rating 6.3 8,096 reviews | |||
| PriceFrom $168 | Free Cancellation | Rating 7.8 2,533 reviews | |||
| PriceFrom $188 | Free Cancellation | Rating 6.9 340 reviews | |||
| PriceFrom $206 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $206 | Free Cancellation | Rating 8.0 7,969 reviews | |||
| PriceFrom $262 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $276 | Free Cancellation | Rating 7.4 8,852 reviews | |||
| PriceFrom $296 | Free Cancellation | Rating 8.0 4,278 reviews |
Delta Flights From Washington, D.C. to Seattle
Delta flies from Washington, D.C. to Seattle around 14 times per week, with 7,973 momondo users rating the airline 8.0/10. The cheapest Delta deal from Washington, D.C. to Seattle in the last 72 hours was $206 (round-trip), much lower than the average airfare cost of $383 for Delta flights on this route.
Alaska Airlines Flights From Washington, D.C. to Seattle
Across 10,000 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Washington, D.C. to Seattle about 20 times each week, with ticket deals ranging from $262 to $481. Price data is based on momondo searches in the last 72 hours.
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Why should I use momondo to find a flight deal from Washington, D.C. to Seattle?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Seattle for you.
Can I find flights from Washington, D.C. to Seattle with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Washington, D.C. to Seattle flights to just show those with flexible booking policies.
How can momondo help me find flights from Washington, D.C. to Seattle?
momondo provides multiple filters to help you find the best flight to Seattle from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Washington, D.C. to Seattle right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Washington, D.C. and alert you when they change.