Cheap flights from Seattle to Ontario

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How to find the cheapest flight from
Seattle (SEA) to Ontario (ONT)

What is the cheapest day to fly round-trip from Seattle to Ontario?

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 47% on the overall cost on flights from Seattle to Ontario.

How far in advance should I book a flight from Seattle to Ontario?

Find a great deal and save up to 44% by booking at least 61 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Seattle to Ontario within the next two weeks, with the cheapest ticket starting at C$ 839.

Cheap flights from Seattle to Ontario in July, August 2020

The best prices found for SEA to ONT flights for July, August
11 Jul - 15 Jul
C$ 161pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
4 Jul - 15 Jul
C$ 166pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
23 Jul - 29 Jul
C$ 171pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
ONT
Ontario
ONT
Ontario
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle to Ontario 2020 flight deals

Cheap flights to Ontario from Seattle found for this year
24 Sep - 3 Oct
C$ 148pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
24 Sep - 2 Oct
C$ 153pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
24 Sep - 27 Sep
C$ 158pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Direct flights to Ontario from Seattle

Save time with Seattle to Ontario direct flight deals
7 Jul - 9 Jul
C$ 953pp
SEA
Seattle/Tacoma Intl
Major Airline
Direct
ONT
Ontario
ONT
Ontario
Major Airline
Direct
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Ontario

Late deals on round-trip flights to Ontario from Seattle, departing today and this week
29 Jun - 4 Jul
C$ 187pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
ONT
Ontario
ONT
Ontario
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
27 Jun - 7 Jul
C$ 207pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
27 Jun - 4 Jul
C$ 217pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

One-way flights to Ontario from Seattle

The cheapest one-way flights from Seattle to Ontario
2:00 a.m. - 8:30 a.m.
Delta
1 stop
6h 30m
SEA - ONT
Delta
C$ 113
Delta
8:28 a.m. - 4:00 p.m.
Multiple Airlines
1 stop
7h 32m
SEA - ONT
Multiple Airlines
C$ 116
FlyFar
2:00 a.m. - 8:30 a.m.
Delta
1 stop
6h 30m
SEA - ONT
Delta
C$ 120
Delta

Related info for your journey

Useful info, stats and facts about Seattle to Ontario flights.

Flight FAQs

From Seattle to Ontario

Can I find flights from Seattle to Ontario for under C$ 200 on Cheapflights?

Yes, there are multiple flights from Seattle to Ontario for under C$ 200. The cheapest flight booked recently is on Multiple Airlines for just C$ 148, but on average you can expect to pay C$ 183.

Are there direct flights from Seattle to Ontario for under C$ 1000 on Cheapflights?

Cheapflights has 1 direct flight from Seattle to Ontario under C$ 1000. A good price for a direct flight from Seattle to Ontario is less than C$ 953.

Are there last-minute flights available from Seattle to Ontario for under C$ 200?

There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than C$ 200.

What days are direct flights available from Seattle to Ontario?

Direct flights are available for this route on the following days: Monday, Tuesday, Saturday.

How popular is this flight route?

This flight path from Seattle to Ontario was viewed by 555 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What is the cheapest airline for this route?

While looking for the best option consider Alaska Airlines Inc., our data currently shows that they have the cheapest flight available for the flight path. When travelling from Seattle to Ontario, generally 76 flights depart for this route daily.

Is Seattle weather warmer or cooler than Ontario?

Expect the weather to be around 35 °C on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Ontario is generally hotter than in Seattle.

Destination information for Ontario

Things to know before you go. Useful info for your trip from Seattle to Ontario

Airports servicing Seattle

Seattle King County/Boeing (BFI)
Seattle Lake Union Spb (LKE)

Airports servicing Ontario

Hourly flight availability from Seattle to Ontario

Afternoon Noon to 6 PM 58% of flight departures
Early morning Midnight to 6 AM 21% of flight departures
Morning 6 AM to noon 21% of flight departures
Evening 6 PM to midnight 0% of flight departures
Midnight
6 AM
Noon
6 PM