Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from $99
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. Dulles Intl Airport departing on 3/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Deals available from 900+ travel sites.
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Seattle to Washington, D.C.
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Hawaiian Airlines flights from Seattle to Washington, D.C. Dulles Intl Airport
Our best Hawaiian Airlines deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets
Delta flights from Seattle to Washington, D.C. Dulles Intl Airport
Our best Delta deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets
See travel insights to Washington, D.C. from
How to get the cheapest flight ticket from Seattle to Washington, D.C. Dulles Intl Airport
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. Dulles Intl Airport?
In general, September is the cheapest month to fly from Seattle to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $351. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $351.
What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?
Our data shows that Tuesday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $463. 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. Dulles Intl Airport for around $581.
What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?
Flying to Washington, D.C. Dulles Intl Airport from Seattle in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $397 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $581 on average. Flights to Washington, D.C. Dulles Intl Airport from Seattle at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
What is the cheapest Seattle/Tacoma Intl to Washington, D.C. Dulles Intl flight route?
Fly from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl for the best Seattle/Tacoma Intl - Washington, D.C. Dulles Intl flight prices
How far in advance should I book a flight to Washington, D.C. Dulles Intl Airport?
You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Seattle when booking 6 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $411 when searching 6 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Seattle for as low as $329 on momondo.
What cabin class options are available on Seattle/Tacoma Intl to Washington, D.C. Dulles Intl flights?
There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Washington, D.C. Dulles Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl?
Alaska Airlines, Frontier, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl
What airlines fly to Washington, D.C. Dulles Intl Airport?
Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Seattle according to our data. Alaska Airlines is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 5 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from Seattle to Washington, D.C. Dulles Intl Airport on average per day?
16 flights are operational daily from Seattle to Washington, D.C. Dulles Intl Airport as of February 2025. The most popular departure time for this route is 9:00AM, with 83% of flights per day taking off at noon.
How many flights depart from Seattle to Washington, D.C. Dulles Intl Airport on average per week?
112 flights are operational weekly from Seattle to Washington, D.C. Dulles Intl Airport as of February 2025. The most popular departure day for this route is Thu, with 19% of flights per week taking off on this day.
When to book flights from Seattle to Washington, D.C. Dulles Intl Airport
Cheap Seattle to Washington, D.C. Dulles Intl Airport (SEA to IAD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Washington, D.C. Dulles Intl Airport
How far is Seattle/Tacoma Intl to Washington, D.C. Dulles Intl by plane?
There are 2299.7 mi between Seattle/Tacoma Intl and Washington, D.C. Dulles Intl. A reasonable flight in good conditions will take 4h 51m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport?
As of February 2025, there are 5 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport.
What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?
The travel and health documents required for your trip to Washington, D.C. Dulles Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C. Dulles Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Seattle to Washington, D.C. Dulles Intl Airport?
Based on momondo bookings for flights between Seattle and Washington, D.C. Dulles Intl Airport, the leading plane model is Boeing 737-900, making up 29.12% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 24.45%, Boeing 737 MAX 9 with 10.71%, and Boeing 737-900 Passenger/BBJ3 (winglets) with 7.07%.
What is the most popular airline from Seattle to Washington, D.C. Dulles Intl Airport?
momondo data reveals that the most frequently booked airline on the route from Seattle to Washington, D.C. Dulles Intl Airport is Alaska Airlines, representing 40% of all bookings. The subsequent popular airlines are United Airlines at 32%, Delta at 27%, and American Airlines at 1%.
Best airlines flying from Seattle to Washington, D.C. Dulles Intl Airport
Compare and see reviews for airlines that fly from Seattle to Washington, D.C. Dulles Intl Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $169 | Free Cancellation | Rating 7.0 374 reviews | |||
| PriceFrom $207 | Free Cancellation | Rating 8.0 8,219 reviews | |||
| PriceFrom $236 | Free Cancellation | Rating 8.0 9,691 reviews | |||
| PriceFrom $245 | Free Cancellation | Rating 7.4 8,765 reviews | |||
| PriceFrom $337 | Free Cancellation | Rating 7.2 10,000 reviews |
Delta Flights From Seattle to Washington, D.C. Dulles Intl Airport
Across 6 Delta flights from Seattle to Washington, D.C. Dulles Intl Airport this week, the average price was $411, with the best Delta deals starting from $207 round-trip. 8,219 users have rated Delta on momondo, with an average score of 8.0/10.
Alaska Airlines Flights From Seattle to Washington, D.C. Dulles Intl Airport
Alaska Airlines is also a popular choice for this route. Alaska Airlines flight deals for Seattle to Washington, D.C. Dulles Intl Airport start from as low as $236 round-trip, depending on your selected dates, with average Alaska Airlines deals seen on momondo around $432. Alaska Airlines operates 6 flights to Washington, D.C. Dulles Intl Airport from Seattle in an average week. Users have rated it 8.0/10 across 9,691 reviews.
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.?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Washington, D.C.. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Seattle to Washington, D.C. with flexible booking policies on momondo?
Yes. All flights to Washington, D.C. from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Seattle to Washington, D.C.?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Washington, D.C..
I’m not ready to book a flight from Seattle to Washington, D.C. right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Seattle to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.