Cheap flights from Boston to Cascade Loop Scenic Byway from CA $282

View CA $282 flight on Tue, Aug. 19, 2025Opens in a new window

Popular airlines from Boston to Cascade Loop Scenic Byway

  • Alaska Airlines

    Alaska Airlines

  • JetBlue Airways

    JetBlue Airways

  • Delta

    Delta

  • American Airlines

    American Airlines

  • Sun Country Airlines

    Sun Country Airlines

  • Spirit Airlines

    Spirit Airlines

  • United

    United

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Cheap flights from Boston (BOS) to Cascade Loop Scenic Byway (SEA)

Prices were available within the past 7 days and start at CA $282 for one-way flights and CA $712 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Jul. 21 - Wed, Aug. 6
BOS
Boston
PAE
Seattle
CA $712 Roundtrip, found 6 days ago
CA $712
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Jul. 21 from Boston to Seattle, returning Wed, Aug. 6, priced at CA $712 found 6 days ago
Alaska Airlines
Sat, Oct. 11 - Sat, Oct. 18
BOS
Boston
PAE
Seattle
CA $799 Roundtrip, found 6 days ago
CA $799
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Sat, Oct. 11 from Boston to Seattle, returning Sat, Oct. 18, priced at CA $799 found 6 days ago
Alaska Airlines
Mon, Jul. 21 - Wed, Aug. 6
BOS
Boston
PAE
Seattle
CA $801 Roundtrip, found 6 days ago
CA $801
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Jul. 21 from Boston to Seattle, returning Wed, Aug. 6, priced at CA $801 found 6 days ago
Alaska Airlines
Sun, Jul. 20 - Tue, Aug. 5
BOS
Boston
PAE
Seattle
CA $939 Roundtrip, found 6 days ago
CA $939
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Sun, Jul. 20 from Boston to Seattle, returning Tue, Aug. 5, priced at CA $939 found 6 days ago
Alaska Airlines
Mon, Aug. 4 - Fri, Aug. 8
BOS
Boston
PAE
Seattle
CA $945 Roundtrip, found 6 days ago
CA $945
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Aug. 4 from Boston to Seattle, returning Fri, Aug. 8, priced at CA $945 found 6 days ago
Alaska Airlines
Sat, Aug. 2 - Tue, Aug. 5
BOS
Boston
PAE
Seattle
CA $1,095 Roundtrip, found 11 hours ago
CA $1,095
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Sat, Aug. 2 from Boston to Seattle, returning Tue, Aug. 5, priced at CA $1,095 found 11 hours ago

Find the cheapest month to fly from Boston (BOS) to Seattle (SEA)

March is typically the cheapest month to fly

From CA $213 - CA $419 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.