| Outbound | Return | Airlines | Shop | Baggage | Price | ||
|---|---|---|---|---|---|---|---|
| Best option Seattle-Tacoma Ontario | Outbound 10/18/25 direct AS1003 02h 34min | Return 11/17/25 direct AS0594 02h 49min |  Alaska Airlines |  | ? | $168 | |
| Seattle-Tacoma Ontario | Outbound 10/18/25 direct AS1254 02h 43min | Return 11/17/25 direct F93164 02h 56min | Alaska Airlines |  | $171 | ||
| Seattle-Tacoma Ontario | Outbound 10/18/25 direct AS1003 02h 34min | Return 11/17/25 direct AS0594 02h 49min | Alaska Airlines |  | $173 | ||
| Seattle-Tacoma Ontario | Outbound 10/18/25 direct AS1254 02h 43min | Return 11/17/25 direct AS0607 02h 50min | Alaska Airlines |  | ? | $174 | |
| Seattle-Tacoma Ontario | Outbound 09/04/25 direct AS1118 02h 44min | Return 09/28/25 direct AS1119 02h 40min | Alaska Airlines | | ? | $178 | |
| Seattle-Tacoma Ontario | Outbound 09/04/25 direct HA6814 02h 49min | Return 09/28/25 direct HA6288 02h 45min |  Hawaiian Airlines | | $182 | ||
| Seattle-Tacoma Ontario | Outbound 10/18/25 1 Stopover (DEN) F93406, F91499 17h 50min | Return 11/17/25 direct F93164 02h 56min |  Frontier Airlines |  | $201 | ||
| Seattle-Tacoma Ontario | Outbound 09/04/25 direct F93163 02h 39min | Return 09/28/25 direct F93164 02h 56min | Frontier Airlines | | $208 | ||
| Seattle-Tacoma Ontario | Outbound 10/18/25 1 Stopover (DEN) F93406, F91499 17h 50min | Return 11/17/25 direct F93164 02h 56min | Frontier Airlines |  | $211 | ||
| Seattle-Tacoma Ontario | Outbound 09/04/25 direct F93163 02h 39min | Return 09/28/25 direct F93164 02h 56min | Frontier Airlines | | $219 |
Tips and tricks to help you find cheap flights from Seattle Tacoma to Ontario
Favorite airline: Frontier Airlines
The majority of passengers on the route Seattle-Tacoma – Ontario prefer to fly with Frontier Airlines.
Frontier Airlines
58 %
Alaska Airlines
26 %
Delta
12 %