Cheap flights from Denver to Seaside from CA $90

View CA $90 flight on Sat, Sep. 6, 2025Opens in a new window

Popular airlines from Denver to Seaside

  • 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 Denver (DEN) to Seaside (PDX)

Prices were available within the past 7 days and start at CA $90 for one-way flights and CA $208 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, Aug. 19 - Tue, Aug. 26
DEN
Denver
PDX
Portland
CA $208 Roundtrip, found 4 days ago
CA $208
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Aug. 19 from Denver to Portland, returning Tue, Aug. 26, priced at CA $208 found 4 days ago
Delta
Tue, Aug. 19 - Sat, Aug. 23
DEN
Denver
PDX
Portland
CA $208 Roundtrip, found 4 days ago
CA $208
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Aug. 19 from Denver to Portland, returning Sat, Aug. 23, priced at CA $208 found 4 days ago
Hawaiian Airlines
Tue, Aug. 19 - Mon, Aug. 25
DEN
Denver
PDX
Portland
CA $209 Roundtrip, found 4 days ago
CA $209
Roundtrip
found 4 days ago
Select Hawaiian Airlines flight, departing Tue, Aug. 19 from Denver to Portland, returning Mon, Aug. 25, priced at CA $209 found 4 days ago
Delta
Mon, Aug. 18 - Sat, Aug. 23
DEN
Denver
PDX
Portland
CA $219 Roundtrip, found 4 days ago
CA $219
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Aug. 18 from Denver to Portland, returning Sat, Aug. 23, priced at CA $219 found 4 days ago
American Airlines
Thu, Aug. 21 - Tue, Aug. 26
DEN
Denver
PDX
Portland
CA $267 Roundtrip, found 4 days ago
CA $267
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Aug. 21 from Denver to Portland, returning Tue, Aug. 26, priced at CA $267 found 4 days ago
United
Thu, Aug. 21 - Tue, Aug. 26
DEN
Denver
PDX
Portland
CA $271 Roundtrip, found 4 days ago
CA $271
Roundtrip
found 4 days ago
Select United flight, departing Thu, Aug. 21 from Denver to Portland, returning Tue, Aug. 26, priced at CA $271 found 4 days ago

Find the cheapest month to fly from Denver (DEN) to Portland (PDX)

February is typically the cheapest month to fly

From CA $66 - CA $378 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.