Cheap flights from Seattle to Washington, D.C. from $172

The month of January is, on average, the cheapest month to fly to Washington, D.C. Reagan-National Airport from Seattle, with most prices found around $299. If you aren’t able to travel to Washington, D.C. Reagan-National Airport during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $339.

The cheapest day to depart from Seattle to Washington, D.C. Reagan-National Airport is on a Thursday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Thursday will often find tickets for as low as $395. Flights from Seattle to Washington, D.C. Reagan-National Airport on a Sunday will generally be more expensive and average around $573. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our data shows that the cheapest Seattle to Washington, D.C. Reagan-National Airport flights are usually those with departure times in the morning. Our users have found flights to Washington, D.C. Reagan-National Airport in the morning for as low as $447. In contrast, the most expensive time of day to depart to Washington, D.C. Reagan-National Airport is at noon when prices are around $454.

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

You are more likely to see cheaper flights to Washington, D.C. Reagan-National Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Reagan-National Airport for around $433 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Reagan-National Airport from Seattle for as low as $352 on momondo.

There are 4 cabin classes available to choose from on Seattle to Washington, D.C. Reagan-National Airport 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 Seattle to Washington, D.C. Reagan-National Airport.

As of August 2026, prices for Seattle to Washington, D.C. Reagan-National Airport flights are approximately 16% cheaper when compared to flights at the same time last year.

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

Alaska Airlines, Delta and United Airlines are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Seattle 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 Washington, D.C. Reagan-National Airport. Keep in mind that there are 6 different airlines that fly to Washington, D.C. Reagan-National Airport on a routine basis, so you have a few additional options to choose from.

Denver (DEN) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Detroit (DTW) offer the lowest average round-trip price of $236.

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 6h 32m.

Detroit (DTW) has the shortest average layover time for this route: 0h 41m.

The number of flights available between Seattle and Washington, D.C. Reagan-National Airport is 3 per day as of August 2026. The most frequent departure time is 1:00PM, with 55% of daily flights leaving at noon.

As of August 2026, there are 23 flights per week flying from Seattle to Washington, D.C. Reagan-National Airport. The most common day of the week flights depart is Wed, with 17% of flights taking off on this day.