Seattle → Ontario flights
Seattle (BFI, SEA)→Ontario (ONT)
from$97
Last observed price · Last checked: 11 Aug 2026 · Price may change
Selected search
Last checked: 11 Aug 2026 · Price may change
$97
Fri 18 Sep 2026 → Mon 21 Sep 2026
Frontier AirlinesNon-stop3 nights
CheapestLast checked: 11 Aug 2026 · Price may change
$97 lowest$247 average2h 52m fastest
Tickets found in the last 7 days
The lowest fares our queries caught, cheapest first.
FA$97Cheapest18 Sep 2026 → 21 Sep 2026Frontier Airlines · Non-stop · 10:53Last checked: 11 Aug 2026 · Price may change3 nightsView ticket →FA$10417 Sep 2026 → 21 Sep 2026Frontier Airlines · Non-stop · 10:53Last checked: 11 Aug 2026 · Price may change4 nightsView ticket →FA$1951 Sep 2026 → 10 Sep 2026Frontier Airlines · Non-stop · 11:54Last checked: 11 Aug 2026 · Price may change9 nightsView ticket →FA$27713 Aug 2026 → 16 Aug 2026Frontier Airlines · Non-stop · 12:19Last checked: 11 Aug 2026 · Price may change3 nightsView ticket →FA$33718 Aug 2026 → 22 Aug 2026Frontier Airlines · Non-stop · 11:54Last checked: 11 Aug 2026 · Price may change4 nightsView ticket →
Starting prices by month
The lowest fare our queries observed in each month. Open a month to see its days; click a day with no price and we will search it for you.
Observed priceLowest monthno price observedLast checked: 11 Aug 2026
Seattle → OntarioFri 18 Sep 2026 · $97
Find flightsRoute facts
Direct flights
Non-stop
BFI - ONT, 2h 52m
Airlines seen
2
Alaska Airlines, Frontier Airlines
Cheapest month
September 2026
$97
Average observed
$247
Typical duration
2h 52m
Alternative airports
1
SEA
Frequently asked
Are there direct flights from Seattle to Ontario?+−
Yes. We have seen non-stop flights on this route, flown by Alaska Airlines.
How much is a flight from Seattle to Ontario?+−
The lowest fare we have observed is $97, found on 11 Aug 2026. Prices move, so read it as a floor rather than a quote.
Which airlines fly from Seattle to Ontario?+−
These are the carriers we have seen on the route: Alaska Airlines, Frontier Airlines.
When is the cheapest month to fly from Seattle to Ontario?+−
In our observations September 2026 is the cheapest month so far, at $97.
Similar routes
Last checked: 11 Aug 2026