Nonstop flights from Seattle to Ontario

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

SEASeattle-Tacoma International

956 mi · 59 flights a week

ONTOntario International

SEAONT

When they leave

Seattle time

8:22a8:33pFirst departure 8:22 AM, last 8:33 PM

Three in the morning, 8:22 AM to 10:25 AM, then three in the afternoon, 12:19 PM to 2:30 PM, then three in the evening, 5:50 PM to 8:33 PM.

Every flight

Earliest first

8:22 AM→11:16 AMDelta Air LinesEmbraer 175Mon, Tue, Wed, Thu, Fri, Sun
8:33 AM→11:14 AMAlaska AirlinesBoeing 737 MAX 8Daily
10:25 AM→1:09 PMAlaska AirlinesBoeing 737Daily
12:19 PM→3:14 PMFrontier AirlinesAirbus A321neoDaily
1:50 PM→4:30 PMAlaska AirlinesBoeing 737 MAX 9Mon, Tue, Wed, Thu, Fri, Sun
2:30 PM→5:21 PMDelta Air LinesEmbraer 175Daily
5:50 PM→8:30 PMAlaska AirlinesBoeing 737Mon, Thu, Fri, Sat, Sun
7:50 PM→10:45 PMDelta Air LinesEmbraer 175Daily
8:33 PM→11:11 PMAlaska AirlinesBoeing 737 MAX 9Daily

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

Flying from Seattle to Ontario

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 Ontario is at 11:14 AM and the last at 11:11 PM. The flight covers 956 miles.

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

Return flights

Ontario to SeattleView

Find the cheapest day to fly from Seattle to Ontario.

Schedules as of Oct 9, 2026.