Ontario to Seattle (ONT–SEA) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
ONT–SEA is served by 2 airlines with nonstop service. Delta Air Lines and Alaska Airlines lead the route. The flight covers 957 miles in approximately 2h 49m. Beyond nonstop, 46 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| DL Delta Air Lines Also: KE, KL, VS, WS | 42 | E75L, E7W | 3h-3h07 | SkyTeam | KE, KL, VS, WS | |
| AS Alaska Airlines Also: FI, HA, JL, QR | 40 | 737, 738, 73J, 7M8 | 2h49-2h51 | Oneworld | FI, HA, JL, QR |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach Seattle from Ontario
| Metric | ONT→SEA | SBD→SEA | SNA→SEA |
|---|---|---|---|
| Distance from ONT | – | 21 mi | 30 mi |
| Nonstop airlines | 2 | 1 | 11 |
| Weekly flights | 147 | 2 | 200 |
| Flight time | 2h 49m | 2h 7m | 2h 45m |
| Departure OTP | 62% | – | – |
Travel Essentials
ONT: PDT · SEA: PDT
When it's 6:00 PM in Ontario, it's 6:00 PM in Seattle.
Link Light Rail from the airport station (inside the terminal) to downtown Seattle takes 38 minutes ($3.50). No transfers needed; trains run 5am to 1am daily.Taxis and ride-shares to downtown cost $35–55. For Bellevue and Eastside destinations (across Lake Washington), ride-share is faster than Link. Car rentals are in the consolidated rental facility; take the free shuttle from baggage claim. Sound Transit buses serve Tacoma, Renton, and Federal Way.
Marine west coast climate. Winters are mild but persistently grey and rainy (3–9°C). Snow is rare at sea level but can occur December through February, causing significant disruptions when it does. The airport sits between Seattle and Tacoma in an area that receives more fog and low cloud than downtown Seattle.
Summers are famously pleasant (18–25°C) with low humidity and mostly clear skies, one of the best flying climates in the US from June through September. The wettest months are November through January.
ONT–SEA Quick Facts
Frequently Asked Questions
Flights from ONT to SEA
Ontario International Airport (ONT) and Seattle–Tacoma International Airport (SEA) are connected by nonstop service from Alaska Airlines and Delta Air Lines. With 147 weekly departures, this is a heavily served route.
ONT to SEA Flight Duration and Schedule
Nonstop flight time from ONT to SEA ranges from 2 hours 49 minutes to 3 hours 7 minutes. The route covers a distance of 957 miles (1,540 km). There are approximately 147 weekly flights outbound and 138 return, totaling 285 flights per week in both directions.
Connecting Options and Alternatives
46 one-stop connections are available, with the fastest taking approximately 2 hours via VNY. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Burbank (BUR).