Nonstop flights from Ontario to Seattle

3 airlines fly this route, with up to 9 flights a day.

ONTOntario International

956 mi · 59 flights a week

SEASeattle-Tacoma International

ONTSEA

When they leave

Ontario time

6:02a9:20pFirst departure 6:02 AM, last 9:20 PM

Three in the morning, 6:02 AM to 11:56 AM, then three in the afternoon, 12:04 PM to 4:49 PM, then three in the evening, 5:26 PM to 9:20 PM.

Every flight

Earliest first

6:02 AM→8:44 AMAlaska AirlinesBoeing 737 MAX 9Daily
6:20 AM→9:17 AMDelta Air LinesEmbraer 175Daily
11:56 AM→2:50 PMDelta Air LinesEmbraer 175Mon, Tue, Wed, Thu, Fri, Sun
12:04 PM→2:44 PMAlaska AirlinesBoeing 737 MAX 8Daily
2:05 PM→4:45 PMAlaska AirlinesBoeing 737Daily
4:49 PM→7:38 PMFrontier AirlinesAirbus A321neoDaily
5:26 PM→8:06 PMAlaska AirlinesBoeing 737 MAX 9Mon, Tue, Wed, Thu, Fri, Sun
6:01 PM→8:50 PMDelta Air LinesEmbraer 175Daily
9:20 PM→11:59 PMAlaska AirlinesBoeing 737Mon, Thu, Fri, Sat, Sun

Schedules last checked Sep 19, 2026. Times are local.

Flying from Ontario to Seattle

Alaska Airlines flies most often, 4 to 5 times a day on the Boeing 737, Boeing 737 MAX 9 and Boeing 737 MAX 8. Delta Air Lines flies 2 to 3 times a day on the Embraer 175. Frontier Airlines flies daily on the Airbus A321neo.

Flights run every day of the week, from 7 on Saturdays to 9 on Mondays, Thursdays, Fridays and Sundays. The first arrival in Seattle is at 8:44 AM and the last at 11:59 PM. The flight covers 956 miles.

Flying back, Seattle to Ontario has 59 nonstop flights a week.

Return flights

Seattle to OntarioView

Find the cheapest day to fly from Ontario to Seattle.

Schedules as of Oct 9, 2026.