- Cheapest roundtrip flight
- from€297
- Fastest flight
- non-stop flights
- 39x / week
- Flight distance
- 1,542 km
- Time difference
- none
- Most popular airlines
- Alaska Airlines
- Delta Air Lines
- Frontier Airlines
- Alaska 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.
offers
Active filtersnone
Matching outbound flightsSEA–ONT · 18 of 18
fromto
dep.arr.
durationstopovers
- October 4 – 10, 2026
- October 11 – 17, 2026
- October 18 – 24, 2026
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
- SEAONTnonstop
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 42 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, averaging around 5 to 6 flights per day, operated by, among others, Alaska Airlines, Delta and Frontier Airlines. If you want to fly without a layover, it is worth filtering specifically for nonstop flights when searching.
Which airlines fly from Seattle-Tacoma to Ontario?
Direct flights from Seattle-Tacoma to Ontario are operated by, among others, Alaska Airlines, Delta and Frontier Airlines. Connecting flights with one stop are also available, for example with Alaska Airlines (via Portland-Oregon). If travel time matters to you, a direct flight is usually the most convenient option. Connecting flights often give you more choice of departure times and airlines.
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?
From Seattle-Tacoma to Ontario, there are on average around 5 to 6 flights per day. This usually means you have a good choice of departure times. If you are flexible, you can easily compare times, prices, and airlines.
How many flights per week are there from Seattle-Tacoma to Ontario?
From Seattle-Tacoma to Ontario, there are around 39 to 40 flights per week. This means you usually have connections available on several days and at various times. Beyond the price, it is worth comparing flight duration, airline, and any potential additional fees.
When does the first flight from Seattle-Tacoma to Ontario depart?
The earliest nonstop flight from Seattle-Tacoma to Ontario usually departs at 8:25 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 9:06 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.