Cheap flights from Seattle to Ontario

SEA — ONT
1 Feb — 8 Feb1
Return
1 adult
Economy
From?
To?
Wed 1/2
Wed 8/2

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 2023: compare Seattle to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.

SEA - ONT

Price

C$ 177 - C$ 398

ONT

Temperature

12 - 26 °C

ONT

Rainfall

3 - 86 mm

Popular inJulyHigh demand for flights, 32% potential price rise
Cheapest inJanuaryBest time to find cheap flights, 35% potential price drop
Round-trip fromC$ 237From Seattle/Tacoma Intl to Ontario
One-way fromC$ 231One-way flight from Seattle/Tacoma Intl to Ontario

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

Tuesday flights are generally found to be more expensive for flights from Seattle to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.

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

To save on the cost of your flight from Seattle to Ontario, book at least 61 days before your planned departure. Booking around this time can save you about 97% on the cost of this flight compared to booking a flight leaving this week. We have found prices from C$ 497 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as C$ 715.

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

January can be a great time to fly to Ontario from Seattle with a flight ticket averaging about C$ 384. Cheapflights users have found deals in the month of January for as cheap as C$ 182. The most expensive prices can be found in the month of June.

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

One of the essential ways to save on airfare from Seattle to Ontario is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 45% on airfare.

Cheap flights from Seattle to Ontario in January, February 2023

The best prices found for SEA to ONT flights for January, February
9 Feb. - 12 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

1 stop

10h 09m
ONT

Ontario

SEA

Seattle/Tacoma Intl

1 stop

14h 04m
C$ 210

Frontier

Deal found 24/1

11 Feb. - 14 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 51m
C$ 211

Alaska Airlines

Deal found 25/1

23 Feb. - 28 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 45m
C$ 225

Alaska Airlines

Deal found 25/1

Seattle to Ontario 2023 flight deals

Cheap flights to Ontario from Seattle found for this year
9 Feb. - 12 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

1 stop

10h 09m
ONT

Ontario

SEA

Seattle/Tacoma Intl

1 stop

14h 04m
C$ 210

Frontier

Deal found 24/1

11 Feb. - 14 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 51m
C$ 211

Alaska Airlines

Deal found 25/1

23 Feb. - 28 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 45m
C$ 225

Alaska Airlines

Deal found 25/1

Cheap Alaska Airlines flights from Seattle to Ontario

11 Feb. - 14 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 51m
C$ 211

Alaska Airlines

Deal found 25/1

23 Feb. - 28 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 45m
C$ 225

Alaska Airlines

Deal found 25/1

8 Feb. - 13 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 51m
C$ 238

Alaska Airlines

Deal found 24/1

Cheap Delta flights from Seattle to Ontario

15 Feb. - 22 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

1 stop

6h 35m
ONT

Ontario

SEA

Seattle/Tacoma Intl

1 stop

7h 09m
C$ 317

Delta

Deal found 26/1

15 Feb. - 20 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 49m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 54m
C$ 332

Delta

Deal found 25/1

8 Feb. - 12 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

1 stop

6h 26m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 54m
C$ 358

Delta

Deal found 24/1

Direct flights to Ontario from Seattle

Save time with Seattle to Ontario direct flight deals
11 Feb. - 15 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 51m
C$ 211

Alaska Airlines

Deal found 25/1

23 Feb. - 28 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 45m
C$ 225

Alaska Airlines

Deal found 25/1

8 Feb. - 13 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 51m
C$ 238

Alaska Airlines

Deal found 24/1

Last minute flights from Seattle to Ontario

Late deals on round-trip flights to Ontario from Seattle, departing today and this week
1 Feb. - 8 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 38m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 56m
C$ 452

Delta

Deal found 24/1

1 Feb. - 7 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

1 stop

4h 59m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 56m
C$ 465

Delta

Deal found 24/1

1 Feb. - 8 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 49m
ONT

Ontario

SEA

Seattle/Tacoma Intl

Nonstop

2h 56m
C$ 479

Delta

Deal found 25/1

One-way flights to Ontario from Seattle

The cheapest one-way flights from Seattle to Ontario
25 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 34m
C$ 106

Alaska Airlines

Deal found 25/1

22 Feb.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 35m
C$ 119

Delta

Deal found 25/1

6 Mar.
SEA

Seattle/Tacoma Intl

ONT

Ontario

Nonstop

2h 35m
C$ 132

Alaska Airlines

Deal found 25/1

Related info for your journey

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

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 35m on average. When it comes time to book airfare, you have a few options: there are 9 outbound flights from Seattle/Tacoma Intl to Ontario offered by 3 different airlines.

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

Some of the carriers operating flights from Seattle/Tacoma Intl to Ontario that may be offering flexible cancellation policies are Alaska Airlines, Delta, and Endeavor 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$ 300 on Cheapflights?

Yes, there are multiple flights from Seattle to Ontario for under C$ 300. The cheapest flight booked recently is on Frontier for just C$ 210, but on average you can expect to pay C$ 269.

Are there direct flights from Seattle to Ontario for under C$ 300 on Cheapflights?

Cheapflights has 20 direct flights from Seattle to Ontario under C$ 300. A good price for a direct flight from Seattle to Ontario is less than C$ 301.

Are there last-minute flights available from Seattle to Ontario for under C$ 500?

There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than C$ 500.

How popular is this Seattle to Ontario flight route?

Within the past month, 33 users have taken a look at flights from Seattle/Tacoma Intl to Ontario.

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

Cheapflights users have booked flights from Seattle to Ontario round-trip from C$ 210. Other airlines that can offer you cheap pricing are Alaska Airlines, from C$ 211, and United Airlines, from C$ 312. Frontier is currently priced 41% below the average price you’ll pay for this route.

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

C$ 106 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from C$ 119 and C$ 231, respectively.

What are the most popular airlines that fly from Seattle to Ontario?

Consider Endeavor Airlines, Alaska Airlines or Delta when booking your flight. These represent the most popular airlines when flying from Seattle to Ontario.

What are the most reliable airlines from Seattle to Ontario?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Ontario on time: KLM (81%), Delta (79%), Alaska Airlines (78%).

What are the cheapest flights from Seattle to Ontario?

Looking for the cheapest flight from Seattle to Ontario? While on average our users pay C$ 856, our data indicates the cheapest price to be C$ 264. The most popular route (Seattle/Tacoma Intl - Ontario), is priced around C$ 238.

Alternative routes for Seattle to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to San Diegofrom C$ 93 pp
Seattle to Los Angelesfrom C$ 129 pp
Seattle to San Josefrom C$ 159 pp
Seattle to Santa Anafrom C$ 196 pp

Top airline flying from Seattle to Ontario

The chart below displays the airlines Cheapflights users travelling from Seattle to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Alaska AirlinesCheapestC$ 125AverageC$ 326FlexibilityNo cancel feeOn-time75%COVID-19 safety
Search Alaska Airlines flights

Hourly flight availability from Seattle to Ontario

See what time of day planes typically take off from Seattle to Ontario
10%of flight departuresEarly morningMidnight to 6 am
15%of flight departuresMorning6 am to noon
49%of flight departuresAfternoonNoon to 6 pm
26%of flight departuresEvening6 pm to midnight
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
Sunday12daily flights
Monday9daily flights
Tuesday10daily flights
Wednesday8daily flights
Thursday12daily flights
Friday12daily flights
Saturday3daily flights
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