Direct flights from Seattle to Ontario SEA → ONT
Alaska Airlines, ATI and Delta Air Lines operate nonstop flights from Seattle (SEA) to Ontario (ONT). The nonstop flight takes around ~1h 56m, covering 957 miles (1,540 km) and operates multiple daily. Updated 28 June 2026.
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Alaska Airlines
AS
ATI
8C
Delta Air Lines
DL
Departure Schedule next 7 days
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Frequently asked questions
Is there a direct flight from Seattle to Ontario?
Yes, Alaska Airlines, ATI and 1 more airline operate nonstop flights from Seattle (SEA) to Ontario (ONT).
Which airlines fly direct from Seattle to Ontario?
Alaska Airlines, ATI, Delta Air Lines operate nonstop flights from Seattle to Ontario.
How long is the flight from Seattle to Ontario?
The nonstop flight from Seattle to Ontario takes ~1h 56m (approximately 1540 km).
How often do direct flights operate from Seattle to Ontario?
Nonstop flights from Seattle to Ontario operate multiple daily.