Cheap flights from Seattle to Washington, D.C. from $89
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Washington, D.C. departing on 8/26. 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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United Airlines flights from Seattle to Washington, D.C.
Our best United Airlines deals on Seattle to Washington, D.C. flight tickets
Southwest flights from Seattle to Washington, D.C.
Our best Southwest deals on Seattle to Washington, D.C. flight tickets
See travel insights to Washington, D.C. from
How to get the cheapest flight ticket from Seattle to Washington, D.C.
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 cheapest month to fly to Washington, D.C.?
The month of September is, on average, the cheapest month to fly to Washington, D.C. from Seattle, with most prices found around $327. If you’re not able to fly to Washington, D.C. in September, then March is your next best option. Flight prices from Seattle to Washington, D.C. during March average around $358.
What is the cheapest day to depart on your flight to Washington, D.C.?
On average, the least expensive day to fly to Washington, D.C. from Seattle is on a Thursday. momondo users have found tickets for Thursday departures for as low as $450. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Washington, D.C. for around $576.
What is the cheapest time of day to depart on your flight to Washington, D.C.?
In the afternoon is the cheapest time of day to fly from Seattle to Washington, D.C. when you can find flight prices for as low as $370. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $532. Of course, these prices can vary depending on the time of year and what airport you fly to.
What is the cheapest Seattle/Tacoma Intl to Washington, D.C. flight route?
Fly from Seattle/Tacoma Intl to Baltimore/Washington for the best Seattle/Tacoma Intl - Washington, D.C. flight prices
How far in advance should I book a flight to Washington, D.C.?
You are more likely to see cheaper flights to Washington, D.C. from Seattle when booking 5 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $426 when searching 5 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Seattle for as low as $319 on momondo.
What cabin class options are available on Seattle/Tacoma Intl to Washington, D.C. flights?
There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Washington, D.C. 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 Seattle to Washington, D.C. flights?
You could potentially save up to 17% on your flight if you consider stops on a Seattle to Washington, D.C. flight.
How have Seattle to Washington, D.C. flight prices changed over time?
As of June 2025, prices for Seattle to Washington, D.C. flights are approximately 16% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Washington, D.C.?
American Airlines, Delta, and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Washington, D.C.
What airlines fly to Washington, D.C.?
Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Washington, D.C. from Seattle according to our data. Alaska Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 9 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.
How many flights depart from Seattle to Washington, D.C. on average per day?
38 flights are operational daily from Seattle to Washington, D.C. as of June 2025. The most popular departure time for this route is 9:00AM, with 40% of flights per day taking off in the evening.
How many flights depart from Seattle to Washington, D.C. on average per week?
As of June 2025, 270 flights take off from Seattle and land in Washington, D.C. each week. The most common flight departure day for this route is Thu, with 18% of weekly flights taking off on this day.
When to book flights from Seattle to Washington, D.C.
Cheap Seattle to Washington, D.C. (SEA to WAS) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Washington, D.C.
Best Price Found | $89 |
|---|---|
Fastest flight time | 4h 51m |
Direct flights | Every day |
Airports in Washington, D.C. | 3 airports |
How far is Seattle/Tacoma Intl to Washington, D.C. by plane?
There are 2320.5 mi between Seattle/Tacoma Intl and Washington, D.C.. 4h 51m is a normal flight duration for this route.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C.?
Prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. are updated daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Washington, D.C.?
As of June 2025, there are 9 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Washington, D.C..
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Washington, D.C.?
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 Seattle/Tacoma Intl Airport to Washington, D.C..
What documentation or ID do you need to fly to Washington, D.C.?
The travel and health documents you'll need for your trip to Washington, D.C. may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington, D.C.. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to Washington, D.C.?
Based on momondo bookings for flights between Seattle and Washington, D.C., the leading plane model is Boeing 737 MAX 9, making up 23.02% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 20.82%, Boeing 737-900 Passenger/BBJ3 (winglets) with 14.74%, and Boeing 737 with 12.14%.
What is the most popular airline from Seattle to Washington, D.C.?
momondo data reveals that the most frequently booked airline on the route from Seattle to Washington, D.C. is Alaska Airlines, representing 45% of all bookings. The subsequent popular airlines are Delta at 23%, United Airlines at 20%, and Frontier at 5%.
Best airlines flying from Seattle to Washington, D.C.
Compare and see reviews for airlines that fly from Seattle to Washington, D.C. with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $86 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $143 | Free Cancellation | Rating 7.8 2,494 reviews | |||
| PriceFrom $182 | Free Cancellation | Rating 6.3 8,052 reviews | |||
| PriceFrom $203 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $206 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $208 | Free Cancellation | Rating 6.9 345 reviews | |||
| PriceFrom $238 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $253 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $296 | Free Cancellation | Rating 8.0 4,287 reviews |
Delta Flights From Seattle to Washington, D.C.
Delta is one of the most popular airlines flying from Seattle to Washington, D.C., operating 14 flights/week on average for this route. A good Delta flight deal for Seattle to Washington, D.C. starts from $203 round-trip, up to an average price of $391. Our users have rated Delta at 8.0/10.
Alaska Airlines Flights From Seattle to Washington, D.C.
Alaska Airlines (8.0/10 from 10,000 reviews) operates around 25 flights from Seattle to Washington, D.C. in any given week. The average Alaska Airlines airfare for this route is around $480, with deals from around $253 rare but found on momondo. Referenced prices are for round-trip Seattle to Washington, D.C. flight searches in the last 72 hours.
Traveling to a place near Washington, D.C.?
Book flights to Washington, D.C. if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Seattle to Washington, D.C.?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington, D.C. from Seattle.
Can I find flights from Seattle to Washington, D.C. with flexible booking policies on momondo?
Flights from Seattle to Washington, D.C. with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Seattle to Washington, D.C.?
Once you have performed a search for Seattle to Washington, D.C. flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Seattle to Washington, D.C. right now. Can momondo alert me if prices change?
Price alerts on flights to Washington, D.C. from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.