Direct flights from Ontario to Seattle
57 nonstop flights a week on 3 airlines. Zero layovers — one hop from ONT to SEA.
Flight time: about 2h2m nonstop
Which days does it fly?
When does it fly?
Departure times in Ontario local time, from flights observed over the last 7 days.
| Flight | Departs | Duration | Days |
|---|---|---|---|
| Alaska ASA607 | 6:13a | 2h1m | Mon, Tue, Sat |
| Alaska ASA607 | 6:19a | 1h59m | Wed, Fri, Sun |
| SkyWest SKW3816 | 6:24a | 2h10m | Sat |
| SkyWest SKW3816 | 6:27a | 2h12m | Wed |
| SkyWest SKW3816 | 6:41a | 1h58m | Mon, Tue, Thu |
| SkyWest SKW3816 | 7:43a | 2h2m | Fri |
| SkyWest SKW3816 | 8:00a | 3h11m | Sun |
| SkyWest SKW4070 | 12:01p | 2h18m | Tue |
| SkyWest SKW4070 | 12:07p | 2h2m | Mon, Wed, Sun |
| Alaska ASA654 | 12:09p | 2h17m | Tue |
| SkyWest SKW4070 | 12:17p | 2h | Fri |
| Alaska ASA654 | 12:18p | 2h9m | Mon, Sat, Sun |
| Alaska ASA607 | 12:19p | 2h1m | Thu |
| SkyWest SKW4070 | 12:31p | 1h57m | Thu |
| Alaska ASA654 | 12:31p | 2h | Wed |
| Alaska ASA654 | 12:57p | 2h10m | Thu |
| Alaska ASA567 | 2:14p | 2h18m | Tue, Sat |
| Alaska ASA567 | 2:19p | 2h9m | Mon |
| Alaska ASA567 | 2:28p | 1h59m | Fri |
| Alaska ASA567 | 2:37p | 2h13m | Sun |
| Alaska ASA567 | 3:14p | 2h14m | Wed |
| Alaska ASA567 | 4:05p | 2h1m | Thu |
| Frontier FFT2275 | 4:12p | 2h | Tue–Wed |
| Frontier FFT2275 | 4:53p | 2h | Mon, Sun |
| Alaska ASA575 | 5:33p | 2h1m | Sun |
| Alaska ASA575 | 5:44p | 1h55m | Fri |
| Frontier FFT2275 | 5:52p | 1h44m | Thu |
| Alaska ASA575 | 6:00p | 2h21m | Mon–Tue |
| Frontier FFT2275 | 6:00p | 1h50m | Fri |
| SkyWest SKW4031 | 6:04p | 2h17m | Sat |
| SkyWest SKW4031 | 6:11p | 2h2m | Mon, Sun |
| SkyWest SKW4031 | 6:24p | 1h58m | Fri |
| Alaska ASA575 | 6:31p | 2h7m | Wed |
| SkyWest SKW4031 | 6:32p | 2h7m | Tue |
| SkyWest SKW4031 | 6:43p | 2h5m | Wed |
| Alaska ASA575 | 7:00p | 2h | Thu |
| SkyWest SKW4031 | 9:05p | 1h56m | Thu |
| Alaska ASA594 | 9:40p | 2h18m | Mon, Sat |
| Alaska ASA594 | 10:16p | 2h4m | Fri |
| Alaska ASA594 | 10:25p | 2h13m | Thu |
| Alaska ASA594 | 11:57p | 2h22m | Sun |
The route
One hop: ONT → SEADrag to pan · scroll with ⌘/Ctrl to zoom · arrow keys when focused
Nonstop from Ontario (ONT) to Seattle (SEA)
Ontario International Airport (ONT) has 57 nonstop flights a week to Seattle (SEA), operated by Alaska, Frontier and SkyWest. No layovers, no connections — one hop out of ONT and you're there.
This route flies every day of the week, so any travel day works. Route data updated July 2026 from observed departures.
Route data updated July 2026 from observed flight departures. Schedules change — always confirm with the airline before booking.
How long is the flight from Ontario to Seattle?
The nonstop flight from Ontario (ONT) to Seattle (SEA) takes about 2h2m in the air, based on recently observed nonstop departures.
How long does it take to drive from Ontario to Seattle?
Driving from Ontario to Seattle takes about 17h 59m behind the wheel — roughly 1,170 miles, or about 2 days of real driving. The nonstop flight takes about 2h2m.