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Find cheap one-way flights from Seattle to Washington D.C. starting at US$69.

Discover our range of affordable one-way and round-trip flights from Seattle to Washington D.C. and kick-start your next adventure today!

  • One way
  • Round-trip
      • Cheapest nonstop
        SEA09:54
        5h 3m
        Nonstop
        IAD17:57
        Wed, Jan 8|Seattle - Washington D.C.|Alaska Airlines
        US$106US$150
        28% OFF
        28% OFF
        US$150US$106

        Choose Alaska Airlines flights from Seattle to Washington D.C..The one-way direct flight with Alaska Airlines departs from Seattle-Tacoma International Airport on Wed, Jan 8, arriving at Dulles International Airport.One-way Prices start from US$106 including taxes and charges.

      • SEA21:39
        5h 1m
        Nonstop
        IAD05:40
        Wed, Dec 25|Seattle - Washington D.C.|Alaska Airlines
        US$110US$150
        27% OFF
        27% OFF
        US$150US$110

        Choose Alaska Airlines flights from Seattle to Washington D.C..The one-way direct flight with Alaska Airlines departs from Seattle-Tacoma International Airport on Wed, Dec 25, arriving at Dulles International Airport.One-way Prices start from US$110 including taxes and charges.

      • SEA15:15
        17h 51m
        1 stop
        DCA12:06
        Thu, Jan 30|Seattle - Washington D.C.|Frontier Airlines
        US$69US$150
        54% OFF
        54% OFF
        US$150US$69

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 30, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$69 including taxes and charges.

      • SEA15:15
        17h 51m
        1 stop
        DCA12:06
        Mon, Jan 27|Seattle - Washington D.C.|Frontier Airlines
        US$70
        US$70

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Mon, Jan 27, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$70 including taxes and charges.

      • SEA15:15
        17h 46m
        1 stop
        DCA12:01
        Thu, Jan 9|Seattle - Washington D.C.|Frontier Airlines
        US$72
        US$72

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 9, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$72 including taxes and charges.

      • SEA15:15
        17h 46m
        1 stop
        DCA12:01
        Fri, Jan 10|Seattle - Washington D.C.|Frontier Airlines
        US$72
        US$72

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Fri, Jan 10, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$72 including taxes and charges.

      • SEA15:15
        17h 51m
        1 stop
        DCA12:06
        Thu, Jan 23|Seattle - Washington D.C.|Frontier Airlines
        US$72
        US$72

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Thu, Jan 23, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$72 including taxes and charges.

      • SEA13:36
        19h 27m
        1 stop
        DCA12:03
        Wed, Feb 26|Seattle - Washington D.C.|Frontier Airlines
        US$73
        US$73

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Wed, Feb 26, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$73 including taxes and charges.

      • SEA15:15
        17h 46m
        1 stop
        DCA12:01
        Mon, Jan 13|Seattle - Washington D.C.|Frontier Airlines
        US$73
        US$73

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Mon, Jan 13, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$73 including taxes and charges.

      • SEA21:36
        21h 20m
        1 stop
        DCA21:56
        Mon, Jan 6|Seattle - Washington D.C.|Frontier Airlines
        US$77
        US$77

        Choose Frontier Airlines flights from Seattle to Washington D.C..The one-way connecting flight with Frontier Airlines departs from Seattle-Tacoma International Airport on Mon, Jan 6, arriving at Ronald Reagan Washington National Airport.One-way Prices start from US$77 including taxes and charges.

      • SEA01:00 pm
        3h 5m
        Nonstop
        WAS02:00 pm
        Sun, Dec 29|Seattle - Washington D.C.|Alaska Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to book flights from Seattle to Washington D.C.?

These price trend charts carefully monitor and predict how flight prices from Seattle to Washington D.C. will change. Keep a close eye on them to understand when the best time to buy your tickets is.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Cheapest airlines flights from Seattle to Washington D.C.

We have a range of prices from different airlines providing flights from Seattle to Washington D.C.. Check below for the journey which best suits your travel needs.

Frontier Airlines
From US$69
Alaska Airlines
From US$101
Delta Air Lines
From US$113
American Airlines
From US$116
Southwest Airlines
From US$134
Jetblue Airways
From US$135
United Airlines
From US$137
Sun Country Airlines
From US$315
Air Canada
From US$635
Spirit Airlines
From US$708

Find more flights and airlines

Find cheap flights from Seattle to Washington D.C. by different airports

There are various non-direct routes from Seattle to Washington D.C. which could be cheaper and faster! Check out these alternative options to see if they could work for your trip.

  • Cheapest
    Frontier Airlines
    SEA
    15:15
    17h 51m
    1 transfer
    DCA
    12:06
    Seattle-Tacoma International Airport - Ronald Reagan Washington National Airport
    Thu, Jan 30Frontier Airlines
    US$69
  • Alaska Airlines
    SEA
    08:45
    22h 44m
    1 transfer
    IAD
    10:29
    Seattle-Tacoma International Airport - Dulles International Airport
    Fri, Jan 24Alaska Airlines
    US$101
  • Alaska Airlines
    SEA
    08:45
    22h 44m
    1 transfer
    IAD
    10:29
    Seattle-Tacoma International Airport - Dulles International Airport
    Fri, Jan 24Alaska Airlines
    US$101
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from Seattle (SEA) to Washington D.C. (WAS) the cheapest?

    Airlines adjust prices for flights from Seattle to Washington D.C. based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from Seattle (SEA) to Washington D.C. (WAS) cost?

    According to Trip.com's data, the lowest price is around $294.

  • How long does it take to fly from Seattle (SEA) to Washington D.C. (WAS) and what is the distance?

    It takes around 5 hours 12 minutes to fly from Seattle (SEA) to Washington D.C. (WAS).

  • What are the most popular airlines that fly from Seattle (SEA) to Washington D.C. (WAS)?

How to find a cheap flight from Seattle to Washington D.C.

Understanding the common pitfalls when booking your flight tickets can help you save massively when it comes time to fly. We’ve listed our six essential steps to keep in mind when you’re booking flight tickets to help you find the best price.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Seattle to Washington D.C. Flight Information

Cheapest nonstop flight price$68
Cheapest round-trip ticket price$193
Off-season for travelNovember
Peak season for travelSeptember
Flight distance3,736.07 km
Average flight time5 hours 12 minutes
Popular airlineAlaska Airlines

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