Ontario to Seattle (ONT–SEA) — Airlines, Schedules & Connections
No flights match your filters.
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 1h 42m. Beyond nonstop, 40 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| DL Delta Air Lines | 35 | E75L, E7W | 2h54-3h07 | SkyTeam | – | |
| AS Alaska Airlines | 25 | 73J, 7M9, B38M | 1h42-2h55 | Oneworld | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
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 | 5 |
| Weekly flights | 62 | 2 | 125 |
| Flight time | 1h 42m | 1h 29m | 1h 48m |
| Departure OTP | 100% | – | – |
Travel Essentials
ONT: PDT · SEA: MDT
When it's 6:00 PM in Ontario, it's 7:00 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 62 weekly departures, this is a heavily served route.
ONT to SEA Flight Duration and Schedule
Nonstop flight time from ONT to SEA ranges from 1 hours 42 minutes to 3 hours 7 minutes. The route covers a distance of 957 miles (1,540 km). There are approximately 62 weekly flights outbound and 62 return, totaling 124 flights per week in both directions.
Connecting Options and Alternatives
40 one-stop connections are available, with the fastest taking approximately 4 hours via BUR. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Burbank (BUR).