Cheap flights from Seattle to Ontario from $93
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 7/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Alaska Airlines flights from Seattle to Region of Ontario
Our best Alaska Airlines deals on Seattle to Region of Ontario flight tickets
United Airlines flights from Seattle to Region of Ontario
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How to get the cheapest flight ticket from Seattle to Region of Ontario
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Region of Ontario?
The month of January is, on average, the cheapest month to fly to Region of Ontario from Seattle, with most prices found around $282. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from Seattle during February instead. Flights to Region of Ontario in February, while not as cheap as those in January, still average around $286.
What is the cheapest day to depart on your flight to Region of Ontario?
According to our data, Tuesday is the cheapest day to fly to Region of Ontario from Seattle. The lowest ticket price found for a Tuesday departure recently was $561. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Seattle to Region of Ontario on a Saturday will generally be more expensive and average around $677. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Region of Ontario?
According to our data, the cheapest time of day to fly to Region of Ontario is in the afternoon. momondo users have found flights departing from Seattle to Region of Ontario in the afternoon for as low as $283. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $619.
What is the cheapest Seattle/Tacoma Intl to Ontario flight route?
Fly from Seattle/Tacoma Intl to Toronto Pearson Intl for the best Seattle/Tacoma Intl - Ontario flight prices
How far in advance should I book a flight to Region of Ontario?
You are more likely to see cheaper flights to Region of Ontario from Seattle when booking 24 weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $424 when searching 24 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from Seattle for as low as $292 on momondo.
What cabin class options are available on Seattle/Tacoma Intl to Ontario flights?
There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Ontario?
WestJet, Air Canada, and Alaska Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Ontario
What airlines fly to Region of Ontario?
Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Region of Ontario from Seattle according to our data. Alaska Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 5 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.
How many flights depart from Seattle to Region of Ontario on average per day?
The number of flights available between Seattle and Region of Ontario is 8 per day as of June 2025. The most frequent departure time is 11:00AM, with 100% of daily flights leaving at noon.
How many flights depart from Seattle to Region of Ontario on average per week?
58 flights are operational weekly from Seattle to Region of Ontario as of June 2025. The most popular departure day for this route is Thu, with 17% of flights per week taking off on this day.
Cheap Seattle to Region of Ontario flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Region of Ontario
Best Price Found | $93 |
|---|---|
Fastest flight time | 4h 39m |
Direct flights | Every day |
Airports in Region of Ontario | 5 airports |
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Ontario?
Prices for flights from Seattle/Tacoma Intl Airport to Ontario are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ontario?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Ontario is 6 as of June 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Ontario?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Ontario.
What documentation or ID do you need to fly to Ontario?
The travel and health documents you'll need for your trip to Ontario may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to Region of Ontario?
momondo data reveals that the most frequently booked plane model on the route from Seattle to Region of Ontario is Airbus A220-300, representing 36.26% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 30.07%, Airbus A330-200 at 6.33%, and Boeing 737-900 Passenger/BBJ3 (winglets) at 5.76%.
Best airlines flying from Seattle to Region of Ontario
Compare and see reviews for airlines that fly from Seattle to Region of Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $135 | Free Cancellation | Rating 7.1 9,553 reviews | |||
| PriceFrom $158 | Free Cancellation | Rating 7.4 8,801 reviews | |||
| PriceFrom $182 | Free Cancellation | Rating 8.0 7,963 reviews | |||
| PriceFrom $242 | Free Cancellation | Rating 7.2 2,873 reviews | |||
| PriceFrom $273 | Free Cancellation | Rating 8.0 10,000 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Seattle to Ontario?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Ontario. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Seattle to Ontario with flexible booking policies on momondo?
Yes. All flights to Ontario from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Seattle to Ontario?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from Seattle.
I’m not ready to book a flight from Seattle to Ontario right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Seattle to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.