Seattle to Ontario (SEA–ONT) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
SEA–ONT is served by 3 airlines with nonstop service. Delta Air Lines, Alaska Airlines and TWY lead the route. The flight covers 957 miles in approximately 2h 35m. Beyond nonstop, 41 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| DL Delta Air Lines | 35 | E75L, E7W | 2h44-3h22 | SkyTeam | – | |
| AS Alaska Airlines | 27 | 73J, 7M9 | 2h35-3h32 | Oneworld | – | |
| TWY TWY | 0 | – | – | – | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Travel Essentials
SEA: MDT · ONT: PDT
When it's 6:00 PM in Seattle, it's 5:00 PM in Ontario.
Link Light Rail runs from downtown Seattle (Westlake station) to the airport in 38 minutes ($3.50 peak). Trains run every 6–12 minutes during peak hours from 5am to 1am. Ride-shares run $30–50 from downtown; SR-99 and I-5 can be heavily congested southbound during afternoon rush (3–7pm).
Sound Transit 574 express bus serves Tacoma ($2.50–4). Sounder commuter rail connects Tacoma to the airport area via a shuttle.
SEA–ONT Quick Facts
Frequently Asked Questions
Flights from SEA to ONT
Seattle–Tacoma International Airport (SEA) and Ontario International Airport (ONT) are connected by nonstop service from Alaska Airlines, Delta Air Lines and TWY. With 62 weekly departures, this is a heavily served route.
SEA to ONT Flight Duration and Schedule
Nonstop flight time from SEA to ONT ranges from 2 hours 35 minutes to 3 hours 32 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
41 one-stop connections are available, with the fastest taking approximately 4 hours via BUR. Two-stop connections are also available via intermediate hubs.