Cheap flights from Philadelphia to Cascade Loop Scenic Byway from CA $288

View CA $288 flight on Tue, Sep. 16, 2025Opens in a new window

Popular airlines from Philadelphia to Cascade Loop Scenic Byway

  • Alaska Airlines

    Alaska Airlines

  • American Airlines

    American Airlines

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  • Delta

    Delta

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Cheap flights from Philadelphia (ILG) to Cascade Loop Scenic Byway (SEA)

Prices were available within the past 7 days and start at CA $288 for one-way flights and CA $946 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, Aug. 2 - Thu, Aug. 7
PHL
Philadelphia
BLI
Bellingham
CA $946 Roundtrip, found 2 days ago
CA $946
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Aug. 2 from Philadelphia to Bellingham, returning Thu, Aug. 7, priced at CA $946 found 2 days ago
Alaska Airlines
Mon, Jul. 28 - Fri, Aug. 1
PHL
Philadelphia
BLI
Bellingham
CA $977 Roundtrip, found 5 days ago
CA $977
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Mon, Jul. 28 from Philadelphia to Bellingham, returning Fri, Aug. 1, priced at CA $977 found 5 days ago
Alaska Airlines
Sat, Aug. 2 - Thu, Aug. 7
PHL
Philadelphia
BLI
Bellingham
CA $1,102 Roundtrip, found 2 days ago
CA $1,102
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Aug. 2 from Philadelphia to Bellingham, returning Thu, Aug. 7, priced at CA $1,102 found 2 days ago
Alaska Airlines
Mon, Jul. 28 - Fri, Aug. 1
PHL
Philadelphia
BLI
Bellingham
CA $1,194 Roundtrip, found 5 days ago
CA $1,194
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Mon, Jul. 28 from Philadelphia to Bellingham, returning Fri, Aug. 1, priced at CA $1,194 found 5 days ago

Find the cheapest month to fly from Philadelphia (PHL) to Seattle (SEA)

September is typically the cheapest month to fly

From CA $189 - CA $373 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.