Cheap flights from Washington Ronald Reagan to Seattle / Tacoma International

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Flight deals from Washington Ronald Reagan to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best return flight from Washington Ronald Reagan Airport to Seattle / Tacoma International Airport? If you want to travel next month, return fares start from $292. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Washington Ronald Reagan to Seattle / Tacoma International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Ronald Reagan to Seattle / Tacoma International flights are currently cheapest in August.

Direct flights from Washington Ronald Reagan to Seattle / Tacoma International

Washington Ronald Reagan to Seattle / Tacoma International: Alternative routes

Compare routes from Washington Ronald Reagan to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

Washington D.C. to Seattle: Flight information

The things to know before you go.
Cheapest flight found$141
Cheapest month to flyAugust
Average flight time5 hrs, 57 mins
Most popular airlineAlaska Airlines
Average flights per week35

Finding cheap flights from Washington Ronald Reagan to Seattle / Tacoma International: Frequently asked questions

The best price we found for a return flight from Washington Ronald Reagan to Seattle / Tacoma International is $267. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
5 hours and 57 minutes is the average flight time from Washington Ronald Reagan to Seattle / Tacoma International.
Alaska Airlines, Delta and Japan Airlines fly direct from Washington Ronald Reagan to Seattle / Tacoma International.
As of May 2026, there are 35 flights per week flying from Washington Ronald Reagan to Seattle / Tacoma International.
The cheapest month to fly from Washington Ronald Reagan to Seattle / Tacoma International is usually July.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Ronald Reagan Airport to Seattle / Tacoma International Airport on Tuesday, 14 July 2026.
Yes – the average flight time is 5 hours and 57 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle / Tacoma International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and Delta offer the cheapest flight tickets to Seattle / Tacoma International.

Flying from Ronald Reagan National Airport (DCA) to Seattle-Tacoma International Airport (SEA): what you need to know

  • The average time for a direct flight from Ronald Reagan National Airport to Seattle-Tacoma International Airport is 5 hours 55 minutes.

  • The timezone in Seattle is UTC-7, which is three hours behind Washington DC.

  • Flights from DCA to SEA start at 08:00 — the first with Alaska Airlines. The last departure is at 17:50 with Alaska Airlines. In total, you can take your pick of 13 weekly Ronald Reagan National Airport to Seattle-Tacoma International Airport flights.

  • Arrive at the airport on time so you don't miss your DCA to SEA flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to prevent a last-minute sprint to your gate.

  • Travelling during a peak month such as February? School holidays and other high seasons can result in longer lines and delays at airport checkpoints. Play it safe and get there up to four hours before international flights and two hours before domestic departures.

  • Getting to Seattle (and then seeing more of United States!) is easy with Alaska Airlines. This popular carrier offers direct flights from Ronald Reagan National Airport to Seattle-Tacoma International Airport.

  • The majority of passengers choose to fly with Alaska Airlines on this route.

  • With 77.5% of services arriving as scheduled, Alaska Airlines is the most punctual carrier offering DCA to SEA flights.

  • If you'd like to split up your journey, just deselect 'Direct flights only' when searching for your ticket from Ronald Reagan National Airport to Seattle-Tacoma International Airport. Here are the most popular stopovers between DCA and SEA:

    • Lambert-St. Louis International Airport

    • Minneapolis-St. Paul International Airport

    • O'Hare International Airport

How to find the cheapest flights from Ronald Reagan National Airport (DCA) to Seattle-Tacoma International Airport (SEA)

  • Right now, $141 is the lowest price we've found for a one-way Ronald Reagan National Airport to Seattle-Tacoma International Airport flight. The best price for a return ticket is $267. Keep in mind that fares can change due to demand when booking.

  • To get cheap tickets from DCA to SEA, reserve your trip nine months ahead of your departure.

  • The cheapest month for flights from Ronald Reagan National Airport to Seattle-Tacoma International Airport is August. Use the 'Whole month' tool to see the lowest prices if you have a flexible travel schedule.

  • Landing cheap flights from DCA to SEA is a breeze with Price Alerts. Simply create one of these automatic alerts and we'll get in touch when there's a better deal.

  • Pick your preferred arrival and departure times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from Ronald Reagan National Airport to Seattle-Tacoma International Airport.

Handy information about Ronald Reagan National Airport (DCA)

  • DCA is located at 1 Aviation Circle.

  • Of all flights departing from Ronald Reagan National Airport, 76.44% land on time at their destination.

  • Central Washington DC to Ronald Reagan National Airport is around 8 kilometres. Depending on traffic, it'll take you about 15 minutes to get there if you're driving, ride-sharing or catching a cab.

  • You can expect a trip time of around 45 minutes on public transport.

  • Need a convenient hotel close to DCA? If you've booked an early flight from Ronald Reagan National Airport to Seattle-Tacoma International Airport, these stays will have you sleeping moments from check-in:

Arriving at Seattle-Tacoma International Airport (SEA)

Getting from Seattle-Tacoma International Airport (SEA) to central Seattle

  • From Seattle-Tacoma International Airport, Seattle is approximately 23 kilometres away. It takes around 20 minutes to get to the centre driving.

  • If you're using public transport, expect a journey time of around 55 minutes.

When to fly to Seattle-Tacoma International Airport (SEA)

  • July is the most popular month for flights from Ronald Reagan National Airport to Seattle-Tacoma International Airport. To escape the crowds, travel to Seattle in May.

  • Book your flight from Ronald Reagan National Airport to Seattle-Tacoma International Airport for August if you'd like to go to Seattle during its warmest month. You can expect temperatures of between 12ºC (54ºF) and 28ºC (82ºF).

  • For cooler conditions, search for a cheap ticket from DCA to SEA in February. Temperatures average between -1ºC (30ºF) and 11ºC (52ºF) then.

Explore more of United States

  • Seattle is easy to fall in love with, but there are so many other corners of United States waiting to be explored. Around 241 kilometres south of Seattle, a trip to Portland will keep you on the move. Start with attractions like Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • If you're looking to explore another major destination in United States, head for Spokane, about 370 kilometres east of Seattle. Manito Park, Northwest Museum of Arts & Culture and Spokane Falls are among its highlights.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.