Direct flights from Ontario to Seattle
All flights from ONT to SEA non-stop. There are direct flights from Ontario International Airport (ONT), California, USA to Seattle Tacoma International (SEA), Washington, USA with Alaska Airlines, Delta Air Lines and Frontier Airlines. 52 weekly departures are currently scheduled on this route. Departure times range from 06:00 to 20:59 depending on the schedule period. The flight distance is 962 miles (1548 km). Flight time ranges from 2 hours and 41 minutes to 3 hours and 6 minutes.
Ontario
, USA
Airlines with non-stop routes:
Alaska Airlines
Delta Air Lines
Frontier Airlines
Flight schedule from Ontario to Seattle with Alaska Airlines
This is a weekly direct flight schedule for Alaska Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.
Flight
The timetable & schedule information was updated at 2026-08-24
Flight schedule from Ontario to Seattle with Delta Air Lines
This is a weekly direct flight schedule for Delta Air Lines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.
Flight
The timetable & schedule information was updated at 2026-08-24
Flight schedule from Ontario to Seattle with Frontier Airlines
This is a weekly direct flight schedule for Frontier Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.
Flight
The timetable & schedule information was updated at 2026-08-24
Ontario to Seattle scheduled departures
Select a date to see every published non-stop departure between ONT and SEA.
ONT - SEA route facts
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Distance962 miles (1548 km)
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Flight time2 hours and 41 minutes to 3 hours and 6 minutes
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Airlines Alaska Airlines Delta Frontier
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Airline alliancesoneworld SkyTeam Low-cost carrier
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CabinsEconomy Business First
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Hub airportsAlaska Airlines: SEA (Primary hub.)Delta Air Lines: SEA
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Departure terminalsAlaska Airlines: Terminal 2Delta Air Lines: Terminal 2
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AircraftAlaska Airlines: Boeing 737-900 (winglets) Passenger/BBJ3, Boeing 737MAX 9 Passenger, Boeing 737-800 (winglets) Passenger/BBJ2, Boeing 737MAX 8 Passenger and Boeing 737-700 PassengerDelta Air Lines: Embraer 175 (Enhanced Winglets) and Airbus A220-300Frontier Airlines: Airbus A321neo and Airbus A320neo
Route FAQ
Nearby airports that offer flights to Seattle (SEA)
From (AUS)
49 flights per week
From (IND)
14 flights per week
From (MEX)
7 flights per week
