Cheap flights from District of Columbia to Seattle from $122

In general, January is the cheapest month to fly from District of Columbia to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $296. If you don’t want to visit Seattle in January, then you should wait until February to fly from District of Columbia, when ticket prices are also cheap, with an average price of $327.

On average, the least expensive day to fly to Seattle from District of Columbia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $436. 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 District of Columbia because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $565.

Flying to Seattle from District of Columbia in the evening is the least expensive time of day to depart. momondo users have found prices as low as $438 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $490. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Washington, D.C. Dulles Intl to Seattle/Tacoma Intl for the best District of Columbia - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from District of Columbia when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $379 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from District of Columbia for as low as $309 on momondo.

There are 4 cabin classes available to choose from on District of Columbia 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.

Delta, United Airlines, and Alaska Airlines are the most popular carriers operating from District of Columbia to Seattle/Tacoma Intl

Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Seattle from District of Columbia according to our data. Alaska Airlines is the first choice among our users, with 52% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 8 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

As of February 2026, 21 flights take off from District of Columbia and land in Seattle each day. The most common flight departure time for this route is 7:00AM, with 46% of daily flights taking off at noon.

152 flights are operational weekly from District of Columbia to Seattle as of February 2026. The most popular departure day for this route is Mon, with 19% of flights per week taking off on this day.