Cheap flights from Dallas to Northwest Washington from CA $118

View CA $118 flight on Mon, Aug. 11, 2025Opens in a new window

Popular airlines from Dallas to Northwest Washington

  • Air Canada

    Air Canada

  • WestJet

    WestJet

  • Flair Airlines

    Flair Airlines

  • American Airlines

    American Airlines

  • United

    United

  • Delta

    Delta

  • Porter Airlines

    Porter Airlines

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap flights from Dallas (DFW) to Northwest Washington (SEA)

Prices were available within the past 7 days and start at CA $118 for one-way flights and CA $271 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Wed, Aug. 13 - Sat, Aug. 30
DFW
Dallas
SEA
Seattle
CA $271 Roundtrip, found 1 day ago
CA $271
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Wed, Aug. 13 from Dallas to Seattle, returning Sat, Aug. 30, priced at CA $271 found 1 day ago
Hawaiian Airlines
Sat, Aug. 16 - Sat, Aug. 30
DFW
Dallas
SEA
Seattle
CA $285 Roundtrip, found 1 day ago
CA $285
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Sat, Aug. 16 from Dallas to Seattle, returning Sat, Aug. 30, priced at CA $285 found 1 day ago
Spirit Airlines
Mon, Aug. 4 - Wed, Aug. 20
DFW
Dallas
SEA
Seattle
CA $285 Roundtrip, found 1 day ago
CA $285
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Mon, Aug. 4 from Dallas to Seattle, returning Wed, Aug. 20, priced at CA $285 found 1 day ago
Alaska Airlines
Wed, Sep. 24 - Wed, Oct. 1
DFW
Dallas
SEA
Seattle
CA $296 Roundtrip, found 21 hours ago
CA $296
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Wed, Sep. 24 from Dallas to Seattle, returning Wed, Oct. 1, priced at CA $296 found 21 hours ago
Delta
Wed, Sep. 10 - Wed, Sep. 17
DFW
Dallas
SEA
Seattle
CA $297 Roundtrip, found 6 days ago
CA $297
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Sep. 10 from Dallas to Seattle, returning Wed, Sep. 17, priced at CA $297 found 6 days ago
American Airlines
Sat, Sep. 13 - Fri, Sep. 19
DFW
Dallas
SEA
Seattle
CA $339 Roundtrip, found 2 days ago
CA $339
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Sep. 13 from Dallas to Seattle, returning Fri, Sep. 19, priced at CA $339 found 2 days ago

Find the cheapest month to fly from Dallas (DFW) to Bellingham (BLI)

September is typically the cheapest month to fly

From CA $359 - CA $1,059 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.