Cheap flights from Seattle to Ontario

View NZ$167 flight on Sat, 30 Aug. 2025Opens in a new window

Popular airlines from Seattle to Ontario

  • 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 35% 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 Seattle (SEA) to Ontario (QLA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, 9 Sep. - Sat, 20 Sep.
SEA
Seattle
ONT
Ontario
NZ$231 Return, found 3 days ago
NZ$231
Return
found 3 days ago
Select Alaska Airlines flight, departing Tue, 9 Sep. from Seattle to Ontario, returning Sat, 20 Sep., priced at NZ$231 found 3 days ago
Hawaiian Airlines
Tue, 23 Sep. - Sat, 11 Oct.
SEA
Seattle
ONT
Ontario
NZ$231 Return, found 3 days ago
NZ$231
Return
found 3 days ago
Select Hawaiian Airlines flight, departing Tue, 23 Sep. from Seattle to Ontario, returning Sat, 11 Oct., priced at NZ$231 found 3 days ago
Delta
Tue, 23 Sep. - Tue, 14 Oct.
SEA
Seattle
ONT
Ontario
NZ$232 Return, found 3 days ago
NZ$232
Return
found 3 days ago
Select Delta flight, departing Tue, 23 Sep. from Seattle to Ontario, returning Tue, 14 Oct., priced at NZ$232 found 3 days ago
Hawaiian Airlines
Sun, 31 Aug. - Sat, 13 Sep.
SEA
Seattle
ONT
Ontario
NZ$265 Return, found 3 days ago
NZ$265
Return
found 3 days ago
Select Hawaiian Airlines flight, departing Sun, 31 Aug. from Seattle to Ontario, returning Sat, 13 Sep., priced at NZ$265 found 3 days ago
United
Sat, 30 Aug. - Sun, 31 Aug.
SEA
Seattle
SNA
Orange County
NZ$451 Return, found 1 day ago
NZ$451
Return
found 1 day ago
Select United flight, departing Sat, 30 Aug. from Seattle to Orange County, returning Sun, 31 Aug., priced at NZ$451 found 1 day ago
American Airlines
Sat, 30 Aug. - Sun, 31 Aug.
SEA
Seattle
SNA
Orange County
NZ$473 Return, found 1 day ago
NZ$473
Return
found 1 day ago
Select American Airlines flight, departing Sat, 30 Aug. from Seattle to Orange County, returning Sun, 31 Aug., priced at NZ$473 found 1 day ago
*Available to Expedia members.