Cheap flights from St. Louis to Seaside from CA $152

View CA $152 flight on Sun, Sep. 14, 2025Opens in a new window

Popular airlines from St. Louis to Seaside

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Cheap flights from St. Louis (STL) to Seaside (PDX)

Prices were available within the past 7 days and start at CA $152 for one-way flights and CA $274 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sun, Sep. 14 - Thu, Sep. 18
STL
St. Louis
PDX
Portland
CA $274 Roundtrip, found 3 days ago
CA $274
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sun, Sep. 14 from St. Louis to Portland, returning Thu, Sep. 18, priced at CA $274 found 3 days ago
Alaska Airlines
Sun, Sep. 14 - Thu, Sep. 18
STL
St. Louis
PDX
Portland
CA $314 Roundtrip, found 3 days ago
CA $314
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sun, Sep. 14 from St. Louis to Portland, returning Thu, Sep. 18, priced at CA $314 found 3 days ago
Alaska Airlines
Sun, Sep. 14 - Thu, Sep. 18
STL
St. Louis
PDX
Portland
CA $326 Roundtrip, found 3 days ago
CA $326
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sun, Sep. 14 from St. Louis to Portland, returning Thu, Sep. 18, priced at CA $326 found 3 days ago
Alaska Airlines
Sun, Sep. 14 - Thu, Sep. 18
STL
St. Louis
PDX
Portland
CA $365 Roundtrip, found 3 days ago
CA $365
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sun, Sep. 14 from St. Louis to Portland, returning Thu, Sep. 18, priced at CA $365 found 3 days ago
American Airlines
Sun, Oct. 12 - Fri, Oct. 17
STL
St. Louis
PDX
Portland
CA $404 Roundtrip, found 2 days ago
CA $404
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sun, Oct. 12 from St. Louis to Portland, returning Fri, Oct. 17, priced at CA $404 found 2 days ago
Delta
Sun, Oct. 12 - Fri, Oct. 17
STL
St. Louis
PDX
Portland
CA $490 Roundtrip, found 2 days ago
CA $490
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Oct. 12 from St. Louis to Portland, returning Fri, Oct. 17, priced at CA $490 found 2 days ago

Find the cheapest month to fly from St. Louis (STL) to Portland (PDX)

September is typically the cheapest month to fly

From CA $161 - CA $405 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.