Cheap flights from Seattle to Ontario

Round-trip
Economy
Seattle (SEA)
Ontario (ONT)
Depart
Return
Any month
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The best prices from Seattle to Ontario are usually found in July or January, booked 33 days in advance, depart on a Tuesday or Monday and return on a Monday

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

All the information you need to plan the best SEA to ONT flight in 2021: compare Seattle to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
SEA - ONT
Price
C$ 213 - C$ 328

Popular in

December

High demand for flights, 24% potential price rise

Cheapest in

July

Best time to find cheap flights, 15% potential price drop

Round-trip from

C$ 213

From Seattle to Ontario

One-way from

C$ 83

One-way flight from Seattle to Ontario

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
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 77% 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 20% 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$ 492.

What is the cheapest month to fly from Seattle to Ontario?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, May can be a great choice for travel to Ontario. Flights to Ontario from Seattle in May are about C$ 454 on average during May, but can be found for as low as C$ 322.

When is the cheapest time to fly from Seattle to Ontario (SEA - ONT)?

Unlike in the morning, when flights are generally more expensive, you can save up to 33% on flights from Seattle to Ontario by exploring options for tickets at noon.

Cheap flights from Seattle to Ontario in May, June 2021

The best prices found for SEA to ONT flights for May, June
23 Jun - 23 Jun
C$ 160pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
20 Jun - 3 Jul
C$ 166pp
SEA
Seattle/Tacoma Intl
Delta
Direct
ONT
Ontario
ONT
Ontario
Delta
Direct
SEA
Seattle/Tacoma Intl
23 Jun - 3 Jul
C$ 177pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
ONT
Ontario
ONT
Ontario
Delta
Direct
SEA
Seattle/Tacoma Intl

Seattle to Ontario 2021 flight deals

Cheap flights to Ontario from Seattle found for this year
23 Jun - 23 Jun
C$ 160pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
5 Aug - 15 Aug
C$ 166pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
31 Jul - 9 Aug
C$ 177pp
SEA
Seattle/Tacoma Intl
Delta
Direct
ONT
Ontario
ONT
Ontario
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

Direct flights to Ontario from Seattle

Save time with Seattle to Ontario direct flight deals
23 Jun - 23 Jun
C$ 160pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
5 Aug - 15 Aug
C$ 166pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
4 Aug - 12 Aug
C$ 178pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
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
27 May - 1 Jun
C$ 214pp
SEA
Seattle/Tacoma Intl
Delta
Direct
ONT
Ontario
ONT
Ontario
Delta
Direct
SEA
Seattle/Tacoma Intl
27 May - 24 Jun
C$ 226pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl
24 May - 27 May
C$ 238pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Direct
ONT
Ontario
ONT
Ontario
Alaska Airlines
Direct
SEA
Seattle/Tacoma Intl

One-way flights to Ontario from Seattle

The cheapest one-way flights from Seattle to Ontario
3:30 p.m. - 5:59 p.m.
Alaska Airlines
Direct
2h 29m
SEA - ONT
Alaska Airlines
4:45 a.m. - 7:15 a.m.
Alaska Airlines
Direct
2h 30m
SEA - ONT
Alaska Airlines
4:49 a.m. - 7:25 a.m.
Alaska Airlines
Direct
2h 36m
SEA - ONT
Alaska Airlines
C$ 108

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Seattle</span> to <span class="emphasized">Ontario</span> flights.

Flight FAQs

From Seattle to Ontario

What airports do I use to fly from Seattle to Ontario?

To fly from Seattle to Ontario, you need to book a flight from Seattle/Tacoma Intl (SEA) to Ontario (ONT). Nonstop flights to Ontario from Seattle/Tacoma Intl take 2h 30m on average. When it comes time to book airfare, you have a few options: there are 8 outbound flights from Seattle/Tacoma Intl to Ontario offered by 1 airline.

What safety measures are being taken by airlines flying from Seattle/Tacoma Intl to Ontario to control the spread of COVID-19?

New policies can now be found on Alaska Airlines to help keep travellers safe while flying. New policies for travellers booking flights from Seattle/Tacoma Intl to Ontario include masks being provided and required on board, daily cleaning and sanitization, use of HEPA filters, pre-flight testing for antibodies and symptoms, and socially-distanced seating (for a limited time). Keep in mind that policies will vary by airline.

Which airlines flying from Seattle/Tacoma Intl to Ontario have flexible changes due to COVID-19?

One of the carriers operating flights from Seattle/Tacoma Intl to Ontario that may be offering flexible change policies is Alaska Airlines. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.

Can I find flights from Seattle to Ontario for under C$ 242 on Cheapflights?

Yes, there are multiple flights from Seattle to Ontario for under C$ 242. The cheapest flight booked recently is on Alaska Airlines for just C$ 160, but on average you can expect to pay C$ 201.

Are there direct flights from Seattle to Ontario for under C$ 242 on Cheapflights?

Cheapflights has 20 direct flights from Seattle to Ontario under C$ 242. A good price for a direct flight from Seattle to Ontario is less than C$ 247.

Are there last-minute flights available from Seattle to Ontario for under C$ 242?

There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than C$ 242.

What days are direct flights available from Seattle to Ontario?

Days when direct flights are available for this flight are: Tuesday, Saturday.

How popular is this flight route?

Flights from Seattle/Tacoma Intl to Ontario have been viewed 552 times in the past calendar month.

How many flights depart from Seattle to Ontario on average per day?

5 flight departures from Seattle/Tacoma Intl to Ontario per day on average.
Afternoon (Noon - 6pm) - 60% of flight departures
Evening (6pm - Midnight) - 40% of flight departures

Does it rain more in Seattle or Ontario?

Seattle will have greater rainfall in 0 compared to Ontario over the next 17 days.

Is Seattle weather warmer or cooler than Ontario?

Our data indicates that the weather will be 35 °C on average in the month of July. The temperature in Ontario is typically hotter than in Seattle. If you're traveling when the temperature is at its warmest, push to plan early, as flight price and availability will have an impact on your travels. For the best results, search for flights well in advance or after peak season.

How long is the flight from Seattle to Ontario?

Departing from Seattle to Ontario will take you 2h 29m. Seattle and Ontario are separated by a distance of 1548 km. All flights are typically direct.

What are the cheapest airlines to flying from Seattle to Ontario round-trip?

Currently priced at C$ 160, Alaska Airlines will fly you from Seattle to Ontario and back. In addition to Alaska Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Delta for as low as C$ 177. Alaska Airlines is priced at 36% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Seattle to Ontario one-way?

To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at C$ 84. Alaska Airlines is not the only option available. At the moment, Delta is another option, for C$ 95.

Destination information for Ontario

Things to know before you go - useful duration and weather info for your trip from Seattle to Ontario.
Flight duration
2h 36m

Airports servicing Seattle

Airports servicing Ontario

Hourly flight availability from Seattle to Ontario

See what time of day planes typically take off from Seattle towards Ontario.
Afternoon Noon to 6 PM 37% of flight departures
Morning 6 AM to noon 31% of flight departures
Evening 6 PM to midnight 31% of flight departures
Early morning Midnight to 6 AM 1% of flight departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Ontario
See how many times per day planes take to the skies headed from Seattle to Ontario.
Sunday
9 daily flights
Monday
9 daily flights
Tuesday
7 daily flights
Wednesday
7 daily flights
Thursday
9 daily flights
Friday
10 daily flights
Saturday
8 daily flights
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