Cheap flights from Riverside

View AU$139 flight on Tue, 9 June 2026Opens in a new window

Popular airlines from Riverside

  • Alaska Airlines

  • United

  • American Airlines

  • Delta

  • Frontier Airlines

  • Southwest Airlines

  • Air Canada

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 35% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheapest flights from Riverside

These prices were available within the past 7 days. Prices quoted are per person, return, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Wed, 27 May - Tue, 9 June
ONT
Ontario
PDX
Portland
AU$280 Return, found 2 days ago
AU$280
Return
found 2 days ago
Select Alaska Airlines flight, departing Wed, 27 May from Ontario to Portland, returning Tue, 9 June, priced at AU$280 found 2 days ago
Alaska Airlines
Sun, 10 May - Wed, 27 May
ONT
Ontario
PDX
Portland
AU$295 Return, found 2 days ago
AU$295
Return
found 2 days ago
Select Alaska Airlines flight, departing Sun, 10 May from Ontario to Portland, returning Wed, 27 May, priced at AU$295 found 2 days ago
Delta
Mon, 8 June - Wed, 10 June
ONT
Ontario
DEN
Denver
AU$295 Return, found 1 day ago
AU$295
Return
found 1 day ago
Select Delta flight, departing Mon, 8 June from Ontario to Denver, returning Wed, 10 June, priced at AU$295 found 1 day ago
Alaska Airlines
Sun, 10 May - Sun, 24 May
ONT
Ontario
PDX
Portland
AU$309 Return, found 2 days ago
AU$309
Return
found 2 days ago
Select Alaska Airlines flight, departing Sun, 10 May from Ontario to Portland, returning Sun, 24 May, priced at AU$309 found 2 days ago
Delta
Tue, 23 June - Tue, 30 June
LGB
Long Beach
DEN
Denver
AU$313 Return, found 6 days ago
AU$313
Return
found 6 days ago
Select Delta flight, departing Tue, 23 June from Long Beach to Denver, returning Tue, 30 June, priced at AU$313 found 6 days ago
Delta
Sat, 20 June - Tue, 23 June
LGB
Long Beach
DEN
Denver
AU$329 Return, found 6 days ago
AU$329
Return
found 6 days ago
Select Delta flight, departing Sat, 20 June from Long Beach to Denver, returning Tue, 23 June, priced at AU$329 found 6 days ago
Delta
Mon, 8 June - Wed, 10 June
ONT
Ontario
DEN
Denver
AU$333 Return, found 1 day ago
AU$333
Return
found 1 day ago
Select Delta flight, departing Mon, 8 June from Ontario to Denver, returning Wed, 10 June, priced at AU$333 found 1 day ago
Delta
Mon, 8 June - Wed, 10 June
ONT
Ontario
DEN
Denver
AU$339 Return, found 1 day ago
AU$339
Return
found 1 day ago
Select Delta flight, departing Mon, 8 June from Ontario to Denver, returning Wed, 10 June, priced at AU$339 found 1 day ago
American Airlines
Sat, 25 Apr - Sat, 2 May
ONT
Ontario
DEN
Denver
AU$409 Return, found 2 days ago
AU$409
Return
found 2 days ago
Select American Airlines flight, departing Sat, 25 Apr from Ontario to Denver, returning Sat, 2 May, priced at AU$409 found 2 days ago
United
Thu, 14 May - Mon, 18 May
PSP
Palm Springs
PDX
Portland
AU$429 Return, found 5 days ago
AU$429
Return
found 5 days ago
Select United flight, departing Thu, 14 May from Palm Springs to Portland, returning Mon, 18 May, priced at AU$429 found 5 days ago

Explore a world of travel with Expedia

*Available to Expedia members.