Ontario to Seattle flights
Direct and connecting flights from Ontario International Airport (ONT) to Seattle Tacoma International Airport (SEA) — airlines, aircraft types, and the safety record for this route.
Route FAQ
How long does the flight from Ontario to Seattle take?
Flight time from Ontario (ONT) to Seattle (SEA) depends on routing, aircraft type, and whether the flight is direct or connecting. A direct flight typically reflects great-circle distance plus winds, while one-stop options can add several hours depending on the layover airport. The typical block time and frequency we have observed for this route are shown above.
Which airlines fly from Ontario to Seattle?
Airline availability for ONT to SEA changes by season and sometimes week to week as carriers adjust capacity. The airlines and aircraft types observed operating this route, both direct and connecting, are listed below based on real flight-tracking data.
Are there direct flights from Ontario to Seattle?
Direct (nonstop) availability on ONT to SEA varies by date, day of week, and season. Busy city pairs usually have multiple daily nonstops, while thinner routes may only have direct service a few days per week or only during peak seasons.
No fatal or serious occurrence involving any operator on this pair in the last 90 days.
- Frontier Airlines58
- Alaska Airlines46
- Delta Air Lines40
- ATNNo data
| Carrier | Sightings / 90d | Safety events |
|---|---|---|
| Frontier Airlines | 3 sightings | No recorded events |
| Delta Air Lines | 2 sightings | No recorded events |
| ATN | 1 sighting | No recorded events |
| Alaska Airlines | 1 sighting | No recorded events |
Planning ONT → SEA
ONT to SEA is a medium-haul route of 1,540 km (957 mi). See the return SEA → ONT route.
Alternative airports near Ontario: Upland (CCB) — 10 km, Chino (CNO) — 10 km, La Verne (POC) — 17 km.
Alternative airports near Seattle: Seattle (BFI) — 9 km, Renton (RNT) — 9 km, Tacoma (TIW) — 28 km.