Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $176

In general, February is the cheapest month to fly from Washington, D.C. Reagan-National Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $293. If you don’t want to visit Seattle in February, then you should wait until January to fly from Washington, D.C. Reagan-National Airport, when ticket prices are also cheap, with an average price of $313.

On average, the least expensive day to fly to Seattle from Washington, D.C. Reagan-National Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $466. 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. Reagan-National Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $589.

Flying to Seattle from Washington, D.C. Reagan-National Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $495 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the evening, with an average ticket price of $651. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Washington, D.C. Reagan-National to Seattle/Tacoma Intl for the best Washington, D.C. Reagan-National - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Washington, D.C. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $462 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. Reagan-National Airport for as low as $389 on momondo.

There are 4 cabin classes available to choose from on Washington, D.C. Reagan-National Airport to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between Washington, D.C. Reagan-National Airport to Seattle.

As of September 2026, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 9% more expensive when compared to flights at the same time last year.

Delta, Southwest, and Alaska Airlines are the most popular carriers operating from Washington, D.C. Reagan-National to Seattle/Tacoma Intl

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Seattle from Washington, D.C. Reagan-National Airport according to our data. Alaska Airlines is the first choice among our users, with 62% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 6 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

3 flights are operational daily from Washington, D.C. Reagan-National Airport to Seattle as of September 2026. The most popular departure time for this route is 8:00AM, with 60% of flights per day taking off at noon.

24 flights are operational weekly from Washington, D.C. Reagan-National Airport to Seattle as of September 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.