Direct flights from Ontario to Seattle
52 nonstop flights a week on 3 airlines. Zero layovers — one hop from ONT to SEA.
Flight time: about 2h15m 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 |
|---|---|---|---|
| SkyWest SKW3816 | 6:04a | 2h17m | Mon |
| Alaska ASA607 | 6:06a | 2h16m | Tue, Thu, Fri, Sat |
| SkyWest SKW3816 | 6:12a | 2h17m | Tue, Fri, Sun |
| SkyWest SKW3816 | 6:16a | 2h15m | Wed, Thu, Sat |
| Alaska ASA607 | 6:40a | 2h18m | Sun |
| Alaska ASA607 | 6:59a | 2h28m | Mon |
| Alaska ASA607 | 7:14a | 2h15m | Wed |
| Alaska ASA1570 | 8:46a | 2h5m | Tue |
| SkyWest SKW4070 | 11:58a | 2h13m | Tue, Fri |
| SkyWest SKW4070 | 12:10p | 2h18m | Mon, Thu, Sun |
| Alaska ASA654 | 12:18p | 2h25m | Mon, Sat, Sun |
| SkyWest SKW4070 | 12:27p | 2h15m | Wed |
| Alaska ASA654 | 12:30p | 2h17m | Tue–Thu |
| Alaska ASA654 | 12:42p | 2h10m | Fri |
| Alaska ASA575 | 3:14p | 2h4m | Sun |
| Alaska ASA575 | 3:18p | 2h23m | Mon, Thu, Fri, Sat |
| Alaska ASA575 | 3:56p | 2h3m | Wed |
| Frontier FFT2275 | 5:17p | 2h22m | Tue |
| Frontier FFT2275 | 5:46p | 2h8m | Wed–Fri |
| Alaska ASA575 | 5:48p | 2h12m | Tue |
| SkyWest SKW4031 | 6:00p | 2h16m | Tue, Fri |
| Frontier FFT2275 | 6:04p | 2h11m | Sun |
| SkyWest SKW4031 | 6:10p | 2h14m | Wed, Sat |
| SkyWest SKW4031 | 6:16p | 2h4m | Thu |
| SkyWest SKW4031 | 6:40p | 2h8m | Mon |
| SkyWest SKW4031 | 7:02p | 2h26m | Sun |
| Alaska ASA594 | 8:02p | 2h32m | Fri, Sun |
| Alaska ASA594 | 8:19p | 2h20m | Mon, Thu |
| Frontier FFT2275 | 8:29p | 2h9m | Mon |
DeltaThe 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 52 nonstop flights a week to Seattle (SEA), operated by Alaska, Delta and Frontier. 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 September 2026 from observed departures.
Route data updated September 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 2h15m 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 2h15m.