Direct flights from Ontario to Seattle ONT → SEA
Alaska Airlines, Delta Air Lines and Frontier Airlines fly nonstop from Ontario (ONT) to Seattle (SEA). The flight takes about 2h 28m and covers 957 miles (1,540 km). Arrivals run on time 78.9% at ONT and 80.8% at SEA — BTS data for the last three months, counting arrivals within 15 minutes of schedule.
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Alaska Airlines
AS
Delta Air Lines
DL
Frontier Airlines
F9
Frequently asked questions
Is there a direct flight from Ontario to Seattle?
Yes, Alaska Airlines, Delta Air Lines and 1 more airline operate nonstop flights from Ontario (ONT) to Seattle (SEA).
Which airlines fly direct from Ontario to Seattle?
Alaska Airlines, Delta Air Lines, Frontier Airlines operate nonstop flights from Ontario to Seattle.
How long is the flight from Ontario to Seattle?
The nonstop flight from Ontario to Seattle takes ~2h 28m (approximately 1540 km).
What is the on-time performance for flights from Ontario to Seattle?
Arrivals run on time 78.9% at ONT and 80.8% at SEA — BTS data for the last three months, counting arrivals within 15 minutes of schedule.
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