Seattle to Ontario
SEAONT
Fly from Seattle to Ontario starting at USD 60 with Frontier Airlines.
Best fare available on May 23, 2026.
Limited seats. Better plans. Book before it's gone.
Seattle to Ontario cheapest flights this week
Seattle to Ontario monthly flight fare trend
May
from USD 60
Jun
from USD 87
Jul
No flights
Aug
No flights
Sep
No flights
Oct
No flights
Airport Details
Origin
Seattle
Seattle–Tacoma International Airport (SEA)
Seattle, SEA
Zone
Los Angeles
Elev
433 ft
Destination
Ontario
Ontario International Airport (ONT)
Ontario, ONT
Zone
Los Angeles
Elev
944 ft
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