- Cheapest roundtrip flight
- from€297
- Fastest flight
- non-stop flights
- 2x / week
- Flight distance
- 1,542 km
- Time difference
- none
- Most popular airlines
- Frontier Airlines
- Delta Air Lines
- Alaska Airlines
- Frontier Airlines
Flight schedule from Seattle-Tacoma (SEA) to Ontario (ONT)
Select a travel date in the flight schedule for the route from Seattle-Tacoma (SEA) to Ontario (ONT) and compare affordable flight deals.
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Matching outbound flightsSEA–ONT · 18 of 18
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- October 18 – 24, 2026
- October 25 – 31, 2026
- November 1 – 7, 2026
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Tips and tricks to help you find cheap flights from Seattle Tacoma to Ontario
Favorite airline: Frontier Airlines
The majority of passengers on the route Seattle-Tacoma – Ontario prefer to fly with Frontier Airlines.
Frontier Airlines
58 %
Alaska Airlines
26 %
Delta
12 %
Important flight information
Frequently Asked Questions (FAQ)
How long is the flight from Seattle-Tacoma to Ontario?
A nonstop flight from Seattle-Tacoma to Ontario typically takes around 2 hours 48 minutes. If you choose a connecting flight, allow more travel time. Typical one-stop itineraries take around 5 hours 55 minutes. For the quickest trip, a nonstop flight is usually the most comfortable choice.
Are there nonstop flights from Seattle-Tacoma to Ontario?
Yes, there are nonstop flights from Seattle-Tacoma to Ontario, although not necessarily every day. On average, around 2 to 3 flights per week are available. If you have flexibility with your travel dates, you will have an easier time finding a suitable nonstop connection.
Which airlines fly from Seattle-Tacoma to Ontario?
Direct flights from Seattle-Tacoma to Ontario are operated by, among others, Frontier Airlines, Delta and Alaska Airlines. These flights take you to Ontario nonstop, making them especially practical for short trips or weekend getaways. It is still worth comparing departure times and airline policies, as baggage rules and fees can vary.
On which days are there nonstop flights from Seattle-Tacoma to Ontario?
Nonstop flights from Seattle-Tacoma to Ontario operate daily. The schedule may vary by season, so it is worth comparing several travel dates. If your preferred day does not have a nonstop flight, nearby departure days or short connecting flights may be a good alternative.
How many flights are there per day from Seattle-Tacoma to Ontario?
On the route from Seattle-Tacoma to Ontario, there is less than one flight per day on average. The exact number can vary by day of the week and season. If you have flexibility with your travel dates, it is worth comparing several departure days.
How many flights per week are there from Seattle-Tacoma to Ontario?
On the route from Seattle-Tacoma to Ontario, there are only a few flights per week. It is therefore especially worthwhile to be flexible with your travel dates so you can more easily find a suitable departure day.
When does the first flight from Seattle-Tacoma to Ontario depart?
The earliest nonstop flight from Seattle-Tacoma to Ontario usually departs at 7:30 AM. The exact departure time may vary by day of the week and airline. Early flights are especially useful if you want to make the most of your arrival day in Ontario.
When does the last flight from Seattle-Tacoma to Ontario depart?
The last nonstop flight from Seattle-Tacoma to Ontario usually departs at 6:49 PM. Late flights can be convenient if you want to travel after work or in the evening. Do check whether it is a nonstop flight, as a connecting itinerary could push the arrival time significantly later.