Cheap flights from Ontario to Seattle (ONT - SEA)

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The best prices from Ontario to Seattle/Tacoma Intl are usually found in January or February, booked 52 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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

All the information you need to plan the best ONT to SEA flight in 2022: compare Ontario to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.
ONT - SEA
Price
$177 - $217
SEA
Temperature
41 - 66.2 °F
SEA
Precipitation
0.7 - 6.6 inches

Popular in

November

High demand for flights, 9% potential price rise

Cheapest in

January

Best time to find cheap flights, 11% potential price drop

Round-trip from

$177

From Ontario to Seattle/Tacoma Intl

One-way from

$84

One-way flight from Ontario to Seattle/Tacoma Intl

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 Ontario to Seattle?

Flights from Ontario to Seattle are found to be more expensive on Saturday. 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 Seattle.

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

Users have found that booking a flight from Ontario to Seattle at least 53 days early can save you up to 110% on average compared to booking a flight this week. If booking 53 days before your flight isn’t an option for you, users have found flights from Ontario to Seattle for as little as $252 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $374 for flights departing within the next 3 days.

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

August can be a great time to fly to Seattle from Ontario with a flight ticket averaging about $172. Cheapflights users have found deals in the month of August for as cheap as $108. The most expensive prices can be found in the month of December.

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

It’s typically best to fly out from Ontario to Seattle at noon. Doing so could potentially save you 21% on the flight price compared to flying in the morning, which is usually more expensive.

Cheap flights from Ontario to Seattle in January, February 2022

The best prices found for ONT to SEA flights for January, February
2 Feb - 7 Feb
$108pp
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
12 Feb - 14 Feb
$113pp
ONT
Ontario
Frontier
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
16 Feb - 22 Feb
$124pp
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario

Ontario to Seattle 2022 flight deals

Cheap flights to Seattle from Ontario found for this year
2 Feb - 7 Feb
$108pp
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
12 Feb - 14 Feb
$113pp
ONT
Ontario
Frontier
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
6 Mar - 29 Mar
$121pp
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario

Non-stop flights to Seattle from Ontario

Save time with Ontario to Seattle direct flight deals
6 Mar - 29 Mar
$121pp
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
13 Feb - 28 Feb
$125pp
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
22 Feb - 1 Mar
$138pp
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario

Last minute flights from Ontario to Seattle

Late deals on round-trip flights to Seattle from Ontario, departing today and this week
2 Feb - 7 Feb
$108pp
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
4 Feb - 6 Feb
$133pp
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Frontier
 
1 STOP
ONT
Ontario
2 Feb - 8 Feb
$134pp
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
ONT
Ontario

One-way flights to Seattle/Tacoma Intl from Ontario

The cheapest one-way flights from Ontario to Seattle
1:00 am - 4:45 am
Alaska Airlines
Nonstop
2h 45m
ONT - SEA
Alaska Airlines
6:41 am - 4:24 am
Frontier
2 Stops
21h 43m
ONT - SEA
Frontier
$92
Kiwi.com
2:15 am - 6:56 am
United Airlines
1 Stop
4h 41m
ONT - SEA
United Airlines
$93
United

Related info for your journey

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

Flight FAQs

From Ontario to Seattle

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

If you wish to fly to Seattle from Ontario, then you need to book flights from Ontario to Seattle/Tacoma Intl. There are 9 flights from Ontario (ONT) to Seattle/Tacoma Intl (SEA) per day to choose from. Flights to Seattle from Ontario are available from 8 different airlines, which means you should have some options if you want to compare airfare deals. 2h 39m is how long a nonstop flight from Ontario to Seattle/Tacoma Intl typically takes.

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

Alaska Airlines, United Airlines, and Delta are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

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

Yes, there are multiple flights from Ontario to Seattle for under $200. The cheapest flight booked recently is on Frontier for just $113, but on average you can expect to pay $134.

Are there nonstop flights from Ontario to Seattle for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Ontario to Seattle under $200. A good price for a nonstop flight from Ontario to Seattle is less than $157.

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

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

What days are nonstop flights available from Ontario to Seattle?

Nonstop flights are available for this route on the following days: Sunday, Tuesday, Wednesday, Thursday, Saturday.

How popular is this Ontario to Seattle flight route?

The Ontario to Seattle/Tacoma Intl flight path was viewed by 204 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

On average 8 flights depart from Ontario to Seattle per day.
Early Morning (Midnight to 6am) - 50% of flight departures
Evening (6pm - Midnight) - 50% of flight departures

How long is the flight from Ontario to Seattle?

There are many flights that can get you from Ontario to Seattle in 2h 45m. Fly via Frontier, Alaska Airlines, or Delta to get the fastest option. There are 962 mi between Ontario and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Cheapflights users have booked flights from Ontario to Seattle round-trip from $113. Other airlines that can offer you cheap pricing are Alaska Airlines, from $121, and Delta, from $147. You may be able to fly from Ontario to Seattle for 43% less than the average price by searching for these airlines.

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

The cheapest airlines for a one-way flight from Ontario to Seattle are Alaska Airlines ($49), Frontier ($55), and Delta ($74).

What are the most reliable airlines from Ontario to Seattle?

Consider KLM (87%), Qatar Airways (83%) or SkyWest Airlines (82%) when booking your flight. These represent the most reliable airlines when flying from Ontario to Seattle.

What are the cheapest flights from Ontario to Seattle?

While on average a flight from Ontario to Seattle is generally $364, our data shows the cheapest flight currently is $78. When looking at the most popular route, (Ontario - Seattle/Tacoma Intl), you can expect to pay $126 for that flight.

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

Major Airline, American Airlines and Alaska Airlines are the most popular airlines when flying from Ontario to Seattle.

COVID Restrictions

View COVID Travel Restrictions for Seattle, WA

Do I need a COVID test to fly to Seattle from Ontario?

Information is based on travel restrictions for travel to Seattle/Tacoma Intl within the United States

Most visitors from Ontario need to provide a negative COVID-19 test result and/or quarantine to enter Seattle/Tacoma Intl.

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Seattle/Tacoma Intl.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Seattle/Tacoma Intl.

Do I need a test to fly back to Ontario from Seattle?

Returning to Ontario from Seattle/Tacoma Intl

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Ontario.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Ontario.

Hide COVID Travel Restrictions for Seattle, WA

Alternative routes for Ontario to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Seattle

Things to know before you go - useful duration and weather info for your trip from Ontario to Seattle.
Flight duration from ONT to SEA
2h 44m
Average temperature for January in Seattle
48.2 °F
Avg rainfall for January in Seattle
5.7 ″

Airports servicing Ontario

Airports servicing Seattle

Top 7 airlines flying from Ontario to Seattle/Tacoma Intl

The chart below displays the airlines Cheapflights users traveling from Ontario to Seattle choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
JetBlue
$71 $225 No cancel fee 62%
United Airlines
$77 $221 No cancel fee 69%
Delta
$87 $226 No cancel fee N/A
American Airlines
$94 $282 No cancel fee 71%
Alaska Airlines
$98 $223 No cancel fee 75%
Frontier
$106 $192 No cancel fee 62%
Spirit Airlines
$149 $276 No cancel fee 65%

Hourly flight availability from Ontario to Seattle

See what time of day planes typically take off from Ontario towards Seattle.
Early morning Midnight to 6 AM 36% of ONT to SEA departures
Afternoon Noon to 6 PM 28% of ONT to SEA departures
Morning 6 AM to noon 22% of ONT to SEA departures
Evening 6 PM to midnight 14% of ONT to SEA departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Ontario to Seattle
See how many times per day planes take to the skies headed from Ontario to Seattle.
Sunday
11 daily flights
Monday
11 daily flights
Tuesday
8 daily flights
Wednesday
6 daily flights
Thursday
10 daily flights
Friday
11 daily flights
Saturday
8 daily flights
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