Ontario to Seattle (ONT–SEA) — Airlines, Schedules & Connections
No flights match your filters.
No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.
Most recently operated nonstop flights — the month shown is when each was last scheduled. Most destinations remain reachable with a connection.
No discontinued nonstop flights on record for this route.
ONT–SEA is served by 3 airlines with nonstop service. Alaska Airlines, Delta Air Lines and Frontier lead the route. The flight covers 957 miles in approximately 2h 42m. Beyond nonstop, 1-stop connecting options are also available.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines Also: FI, HA, JL, QR | 34 | 73H, 73J, 7M8, B39M | 2h28-2h42 | Oneworld | FI, HA, JL, QR | |
| DL Delta Air Lines Also: KE, KL, SK, VS, WS | 20 | E75L, E7W | 2h49-2h55 | SkyTeam | KE, KL, SK, VS, WS | |
| F9 Frontier Also: Y4 | 7 | 32Q | 2h49 | – | Y4 |
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 | 3 | 1 | 16 |
| Weekly flights | 172 | 2 | 198 |
| Flight time | 2h 42m | 1h 57m | 2h 7m |
| Departure OTP | 67% | – | – |
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, Delta Air Lines and Frontier. With 172 weekly departures, this is a heavily served route.
ONT to SEA Flight Duration and Schedule
Nonstop flight time from ONT to SEA is about 2 hours 42 minutes gate to gate. The route covers a distance of 957 miles (1,540 km). There are approximately 172 weekly flights outbound and 118 return, totaling 290 flights per week in both directions.
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Portland, San Francisco Bay Oakland and Sacramento. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Long Beach (LGB).