Seattle to Ontario (SEA–ONT) — 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.
SEA–ONT is served by 5 airlines with nonstop service. Alaska Airlines, Delta Air Lines and Frontier lead the route. The flight covers 957 miles in approximately 2h 44m. Beyond nonstop, 1-stop connecting options are also available.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines Also: HA, JL, QR | 35 | 738, 73J, B39M | 2h38-2h44 | Oneworld | HA, JL, QR | |
| DL Delta Air Lines Also: KE, KL, SK | 20 | E7W | 2h51-3h04 | SkyTeam | KE, KL, SK | |
| F9 Frontier Also: Y4 | 7 | 32Q | 2h56 | – | Y4 | |
| WS WestJet | 7 | – | – | – | – | |
| TWY TWY | 0 | – | – | – | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Travel Essentials
SEA: PDT · ONT: PDT
When it's 6:00 PM in Seattle, it's 6:00 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, Frontier and WestJet. With 118 weekly departures, this is a heavily served route.
SEA to ONT Flight Duration and Schedule
Nonstop flight time from SEA to ONT is about 2 hours 44 minutes gate to gate. The route covers a distance of 957 miles (1,540 km). There are approximately 118 weekly flights outbound and 172 return, totaling 290 flights per week in both directions.
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Sacramento, San Francisco Bay Oakland and Norman Y. Mineta San Jose. Two-stop connections are also available via intermediate hubs.