Cheapest one way flight
$78
Frontier Airlines
1 transfer
4h 36m
10/10/2025
The cheapest one-way flight from Seattle to Ontario departs on 10/10/2025, is operated by Frontier Airlines and costs $78
Cheapest round trip flight
$109
Frontier Airlines
Direct flight
5h 45m
10/25/2025
The cheapest roundtrip flight from Seattle to Ontario departs on 10/25/2025, is operated by Frontier Airlines and costs $109
The fastest flight
2h 40m
Fastest flight from Seattle to Ontario takes 2h 40m
Direct flights
Several times a week
There are direct flights on this route 4 days a week: Mo, We, Th, and Sa
Earliest flight
7:30 AM
Latest flight
9:30 PM
Direct flights count
118
Distance
1557km
Timezone difference
0h
The distance between Seattle and Ontario is 1557km (965 miles). There are 118 direct flights from Seattle to Ontario. Seattle and Ontario are in the same time zone. Flights from Seattle begin at 7:30 AM. The latest flight from Seattle departs at 9:30 PM
