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Cheap Flights from Washington D.C. to Seattle / Tacoma International

Compare Washington D.C. to Seattle / Tacoma International flight deals

Find the cheapest month or even day of the year to fly to Seattle / Tacoma International

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Flight deals from Washington D.C. to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best return flight from Washington D.C. to Seattle / Tacoma International Airport? If you want to travel next month, return fares start from R 2,619. Find the lowest prices on one-way and return tickets right here.
Seattle.R 978 per passenger.Departing Wed, 30 Sep.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Baltimore Washington International on Wed, 30 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 978, select.
Seattle.R 1,142 per passenger.Departing Tue, 6 Oct.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Tue, 6 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 1,142, select.
Seattle.R 1,477 per passenger.Departing Fri, 13 Nov.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Fri, 13 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 1,477, select.
Seattle.R 1,477 per passenger.Departing Mon, 31 Aug.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Mon, 31 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 1,477, select.
Seattle.R 2,552 per passenger.Departing Sun, 30 Aug.One-way flight with United.Outbound direct flight with United departs from Washington Dulles on Sun, 30 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,552, select.
Seattle.R 3,116 per passenger.Departing Wed, 21 Oct.One-way flight with KLM.Outbound direct flight with KLM departs from Washington Dulles on Wed, 21 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,116, select.
Seattle.R 3,307 per passenger.Departing Mon, 2 Nov.One-way flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Mon, 2 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,307, select.
Seattle.R 3,648 per passenger.Departing Wed, 20 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Wed, 20 Jan, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,648, select.
Seattle.R 3,656 per passenger.Departing Tue, 1 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Tue, 1 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,656, select.
Seattle.R 3,658 per passenger.Departing Mon, 14 Dec.One-way flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Mon, 14 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,658, select.
Seattle.R 3,658 per passenger.Departing Sat, 20 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Sat, 20 Feb, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,658, select.
Seattle.R 3,803 per passenger.Departing Thu, 29 Apr.One-way flight with Delta.Outbound indirect flight with Delta, departs from Baltimore Washington International on Thu, 29 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,803, select.
Seattle.R 3,910 per passenger.Departing Fri, 7 May.One-way flight with Delta.Outbound indirect flight with Delta, departs from Baltimore Washington International on Fri, 7 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,910, select.
Seattle.R 3,910 per passenger.Departing Sat, 5 Jun.One-way flight with United.Outbound indirect flight with United, departs from Baltimore Washington International on Sat, 5 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,910, select.
Seattle.R 3,910 per passenger.Departing Tue, 23 Mar.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Tue, 23 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,910, select.
Seattle.R 4,008 per passenger.Departing Wed, 29 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Wed, 29 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 4,008, select.

Find the cheapest month to fly from Washington D.C. 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 D.C. to Seattle / Tacoma International flights are currently cheapest in September.
Jul
from R 4,008
Aug
from R 1,477
Sep
from R 978
Oct
from R 1,142
Nov
from R 1,477
Dec
from R 3,656
Jan
from R 3,648
Feb
from R 3,658
Mar
from R 3,910
Apr
from R 3,803
May
from R 3,910
Jun
from R 3,910

Direct flights from Washington D.C. to Seattle / Tacoma International

Washington D.C. to Seattle / Tacoma International: Alternative routes

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

Seattle Lake Union SPB

2km from central Seattle
Closest
from R 4,712
Search flights

Seattle Boeing Fld

11km from central Seattle
from R 4,472
Search flights

Seattle / Tacoma International

20km from central Seattle
Cheapest
from R 978
Search flights

Paine Field

33km from central Seattle
from R 2,689
Search flights

Washington D.C. to Seattle: Flight information

The things to know before you go.
Cheapest flight foundR 978
Cheapest month to flySeptember
Average flight time5 hrs, 53 mins
Most popular airlineAlaska Airlines
Average flights per week263

Finding cheap flights from Washington D.C. to Seattle / Tacoma International: Frequently asked questions

The best price we found for a return flight from Washington D.C. to Seattle / Tacoma International is R 2,123. 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 52 minutes is the average flight time from Washington D.C. to Seattle / Tacoma International.
Alaska Airlines, United and Qatar Airways fly direct from Washington D.C. to Seattle / Tacoma International.
As of July 2026, there are 526 flights per week flying from Washington D.C. to Seattle / Tacoma International.
The cheapest month to fly from Washington D.C. to Seattle / Tacoma International is usually September.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Washington D.C. to Seattle / Tacoma International Airport on Tuesday, 8 September 2026.
Yes – the average flight time is 5 hours and 52 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.

The cheapest airline that flies to Seattle / Tacoma International is Southwest Airlines .

Flying from Washington DC to Seattle-Tacoma International Airport (SEA): What you need to know

  • Get your trip planning underway by looking up the ideal departure point for your flight from Washington DC to Seattle-Tacoma International Airport (SEA). Explore the options for setting off from Ronald Reagan Washington National Airport (DCA) or Washington Dulles International Airport (IAD), two of the city's main airports.

  • Expect to be in the air for 6 hours. That's the average time for a direct Washington DC to Seattle-Tacoma International Airport flight.

  • The timezone in Seattle is UTC-8, which is three hours behind Washington DC. Seattle-Tacoma International Airport is located in Seattle.

  • With 19 direct weekly flights between the two airports, Ronald Reagan Washington National Airport (DCA) to Seattle-Tacoma International Airport (SEA) is the most popular route. Alaska Airlines operates the earliest flight at 8am. If you'd like to get more out of your day before flying, the last flight from DCA to SEA is with Alaska Airlines at 5:55pm.

  • Give yourself plenty of time to make your flight from Washington DC to SEA. As a general rule, turn up at least two hours before international departures and an hour ahead for domestic flights.

  • July is a popular time to fly out. If you're taking off then or during a major holiday like July Fourth, turn up even earlier. Aim for at least two hours ahead for domestic flights and up to four hours for international journeys.

Airports in Washington DC

Ronald Reagan Washington National Airport (DCA)

  • Enjoy an uninterrupted journey from Ronald Reagan Washington National Airport (DCA). Direct flights from Washington DC to Seattle-Tacoma International Airport (SEA) can be booked from here.

  • You'll find a direct flight from Washington DC to Seattle-Tacoma International Airport with Alaska Airlines. This top carrier operates services from DCA.

  • Alaska Airlines is the airline most travellers choose for flights from DCA to SEA.

  • Alaska Airlines is the most punctual carrier on this route, with 71.67% of its services reaching their destination on time.

  • DCA is about 6 kilometres from central Washington DC. If you're catching a taxi, driving or ride-sharing from the centre, it'll take you 10 minutes or so to get there, depending on traffic conditions. If you're using public transport, expect the journey time to be around 25 minutes.

  • Catching an early flight from Washington DC to Seattle-Tacoma International Airport? Avoid rushing to the terminal (and catch some extra z's) by choosing one of these stays close to Ronald Reagan Washington National Airport:

  • Of all flights leaving Ronald Reagan Washington National Airport, 71% land on schedule at their destination.

  • You'll find DCA at 1 Aviation Circle.

Washington Dulles International Airport (IAD)

  • You can book a direct Washington DC to Seattle-Tacoma International Airport (SEA) plane ticket out of Washington Dulles International Airport (IAD). Figure out if flying from IAD works better for your plans.

  • When setting off from IAD, you can pick from a variety of airlines that have direct flights from Washington DC to SEA. Reach cruising altitude with one of these carriers:

  • On the IAD to SEA route, Alaska Airlines is the favourite choice for most passengers.

  • Flights between Washington Dulles International Airport and Seattle-Tacoma International Airport tend to arrive on time more often with United compared to other carriers.

  • You can get to IAD from the centre of Washington DC in about 45 minutes by car, depending on traffic. The journey by public transport will take roughly 1 hour 10 minutes to cover the 40 kilometres or so.

  • Start your holiday sooner with an extra night away from home. Before your Washington DC to SEA flight, kick back in one of these hotels close to Washington Dulles International Airport:

  • When it comes to keeping flights punctual, Washington Dulles International Airport has an on-time arrival performance of 77%.

  • IAD is located at 1 Saarinen Circle.

Baltimore Washington International Airport (BWI)

  • One flight, no fuss. You can book a direct flight from Washington DC to Seattle-Tacoma International Airport departing from Baltimore Washington International Airport (BWI).

  • Prepare for takeoff with Alaska Airlines. It offers direct Washington DC to SEA plane tickets from BWI.

  • Most passengers choose to fly with Alaska Airlines from BWI to SEA.

  • The most reliable carrier for punctuality on this route is Alaska Airlines. Its services land as scheduled 74.4% of the time.

  • The trip to BWI from the centre of Washington DC is around 50 minutes on public transport. If you're in a car, it'll take you roughly 40 minutes to cover the 48 kilometres or so.

  • Wake up, take it easy and still make your Washington DC to Seattle-Tacoma International Airport flight with plenty of time to spare. These hotels near Baltimore Washington International Airport make departure day a breeze if you're flying out first thing:

  • Flights that depart from BWI touch down at their destination on schedule 77% of the time.

About Seattle-Tacoma International Airport (SEA)

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

  • Central Seattle is around 23 kilometres from Seattle-Tacoma International Airport and takes about 25 minutes to reach by car. See what your options are for getting into town, whether that's with a car hire, taxi or ride-share.

  • If you're using public transport, expect a journey time of about 35 minutes.

How to find the cheapest flights from Washington DC to Seattle-Tacoma International Airport (SEA)

  • Currently, R 978 is the lowest price we've found for a one-way ticket from Washington DC to Seattle-Tacoma International Airport. The cheapest price for a return flight is R 2,123. Keep in mind fares can change due to availability at the time of booking.

  • Score cheap flights from Washington DC to SEA by booking one month ahead. Based on our research, that's the sweet spot for finding the biggest deals.

  • The best month for picking up cheap Washington DC to Seattle-Tacoma International Airport tickets is June. Use the 'Whole month' tool to compare prices, then choose the dates that offer the lowest fares.

  • Snapping up a cheap plane ticket from Washington DC to SEA couldn't be easier with Price Alerts. All you need to do is create one of these automatic alerts and we'll let you know when there's a better deal.

  • Filters make it easier to scoop up a deal on your flight from Washington DC to Seattle-Tacoma International Airport. Choose the departure times, airlines and number of stops that line up with your plans. Then sort the results by 'Cheapest' to bring up the lowest fares right away.

The best time to fly from Washington DC to Seattle-Tacoma International Airport (SEA)

  • It's time to work out when to book your flight from Washington DC to Seattle-Tacoma International Airport (SEA). July is the busiest month to travel to Seattle. If you're all about a more relaxed kind of trip, go in December.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC (54ºF) and 28ºC (82ºF). Lock in your Washington DC to SEA plane ticket then if that's your definition of good weather.

  • February sees temperatures of between -1ºC (30ºF) and 11ºC (52ºF). Look for cheap tickets from Washington DC to Seattle-Tacoma International Airport around that time if you want to travel in cooler conditions.

More about Seattle

  • When it comes to looking for somewhere to lay your head, you'll find the top stays in Seattle right here. Browse these options after you've booked your flight from Washington DC to Seattle-Tacoma International Airport:

  • Every great adventure has to include a little sightseeing. Space Needle, Pike Place Market and Seattle Skyline are essential stops on your Seattle itinerary.

Explore more of the United States

  • Seattle has its own special appeal, but there are so many other parts of the United States you should also see. Around 209 kilometres south of Seattle, a trip to Portland will keep you on the go. Check out popular attractions like Portland Japanese Garden, Peninsula Park Rose Garden and Beyond Van Gogh Portland.

  • Around 209 kilometres south of Seattle, Vancouver is another essential stop in the United States. No visit is complete without checking out Reconstructed HBC Fort Vancouver, The Marshall House: Victorian Jewel of Officers Row and Clark County Historical Museum.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.