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$42+ Cheap flights from Ontario to Seattle (ONT - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Jul 30 — Aug 61
From?
To?
Tue 7/30
Tue 8/6
1 adult, Economy
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The best prices from Ontario to Seattle/Tacoma Intl are usually found in October or May, booked 80 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Ontario to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 25, 2024.

Popular in

December

Cheapest in

October

Round-trip from

$58
(Frontier)

One-way from

$42
(FlightNetwork)
High demand for flights, 16% potential price rise
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Best time to find cheap flights, 15% potential price drop
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From Ontario to Seattle/Tacoma Intl
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One-way flight from Ontario to Seattle/Tacoma Intl
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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 48 days early can save you up to 72% on average compared to booking a flight this week. If booking 48 days before your flight isn’t an option for you, users have found flights from Ontario to Seattle for as little as $253 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 $391 for flights departing within the next 3 days.

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

October can be a great time to fly to Seattle from Ontario with a flight ticket averaging about $227. Cheapflights users have found deals in the month of October for as cheap as $69. The most expensive prices can be found in the month of December.

What is the cheapest time of day to fly from ONT to SEA?

It’s typically best to fly out from Ontario to Seattle in the morning. Doing so could potentially save you 6% on the flight price compared to flying in the evening, which is usually more expensive.

Cheap Ontario to Seattle flights in July & August 2024

Find cheap flight options from Ontario to Seattle specifically for the months of July and August 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Prices were last updated on July 25, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Seattle in 2024. For more flight deals, be sure to check back very soon.
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/284:01 pmONT - SEA
Nonstop2h 36mFrontier
Wed 9/49:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$78
This Trip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2412:43 pmONT - SEA
Nonstop2h 36mFrontier
Wed 8/289:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$93
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/214:01 pmONT - SEA
Nonstop2h 36mFrontier
Wed 8/289:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$97
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1012:43 pmONT - SEA
Nonstop2h 36mFrontier
Wed 8/149:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$98
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1712:43 pmONT - SEA
Nonstop2h 36mFrontier
Mon 8/199:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$99
This mytrip.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/309:58 amONT - SEA
Nonstop2h 36mFrontier
Thu 8/13:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/23$100
This mytrip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1912:49 amONT - SEA
1 stop7h 49mFrontier
Wed 9/49:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/25$101
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2712:59 amONT - SEA
1 stop6h 05mFrontier
Wed 9/49:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$103
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/288:15 pmONT - SEA
1 stop12h 29mFrontier
Wed 9/49:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$104

Ontario to Seattle 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Seattle in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Seattle in 2024. For more flight deals, be sure to check back very soon.
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/239:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 10/301:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/24$58
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/69:50 amONT - SEA
Nonstop2h 47mFrontier
Tue 11/121:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/23$60
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/44:01 pmONT - SEA
Nonstop2h 36mFrontier
Mon 9/97:22 pmSEA - ONT
Nonstop2h 45mFrontier
Deal found 7/24$78
This mytrip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/311:44 amONT - SEA
Nonstop2h 36mFrontier
Sat 9/74:20 pmSEA - ONT
Nonstop2h 45mFrontier
Deal found 7/25$80
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/239:50 amONT - SEA
Nonstop2h 47mFrontier
Sun 10/271:53 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/24$83
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/69:50 amONT - SEA
Nonstop2h 47mFrontier
Fri 11/81:53 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/24$85
This Trip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2412:43 pmONT - SEA
Nonstop2h 36mFrontier
Wed 8/289:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$93
This Gotogate deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/308:58 amONT - SEA
Nonstop2h 43mFrontier
Mon 10/77:22 pmSEA - ONT
Nonstop2h 45mFrontier
Deal found 7/25$94
This FlightNetwork deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightNetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/57:58 amONT - SEA
Nonstop2h 43mFrontier
Mon 9/97:22 pmSEA - ONT
Nonstop2h 45mFrontier
Deal found 7/24$95

Ontario to Seattle flights leaving soon

Find last-minute flight options from Ontario to Seattle for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
Have a look at some of the last-minute flights available departing from Ontario to Seattle. Users should be sure to double check the price, date, and time of their last-minute flight.
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/312:52 pmONT - SEA
Nonstop2h 32mFrontier
Tue 8/203:20 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/25$98
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/309:58 amONT - SEA
Nonstop2h 36mFrontier
Thu 8/83:39 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$100
This CheapOair deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/319:58 amONT - SEA
Nonstop2h 36mFrontier
Wed 8/71:39 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$109
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/312:52 pmONT - SEA
Nonstop2h 32mFrontier
Fri 8/239:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/25$112
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/319:58 amONT - SEA
Nonstop2h 36mFrontier
Thu 8/83:39 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$119
This mytrip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/319:58 amONT - SEA
Nonstop2h 36mFrontier
Thu 8/83:39 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/25$121
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/312:52 pmONT - SEA
Nonstop2h 32mFrontier
Mon 8/199:59 pmSEA - ONT
1 stop9h 18mFrontier
Deal found 7/25$123
This mytrip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/312:52 pmONT - SEA
Nonstop2h 32mFrontier
Tue 8/209:38 amSEA - ONT
1 stop14h 21mFrontier
Deal found 7/25$128
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/312:52 pmONT - SEA
Nonstop2h 32mFrontier
Sun 9/159:46 pmSEA - ONT
1 stop9h 36mFrontier
Deal found 7/25$133

One-way flights to Seattle from Ontario

Search for one-way flight options from Ontario to Seattle. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
Users traveling one-way from Ontario to Seattle can select one of these great deals. Users in need of a round-trip flight from Ontario to Seattle instead should update the search form at the top of page.
This FlightNetwork deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightNetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/312:52 pmONT - SEA
Nonstop2h 32mFrontier
Deal found 7/25$42
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/284:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$47
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2711:44 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$48
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/214:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$49
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/126:19 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$50
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/710:03 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$51
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2510:06 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/25$54
This mytrip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2010:06 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/25$55
This FlightNetwork deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightNetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/88:48 amONT - SEA
Nonstop2h 43mFrontier
Deal found 7/25$60

Find flights from Ontario to Seattle within your budget

Customize your flight search to find flights from Ontario to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$58 - $167

Route

Depart

Return

Price

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 10/9

Nonstop2h 47m

Seattle/Tacoma Intl

Wed 10/16

Nonstop2h 37m

$58

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 11/6

Nonstop2h 47m

Seattle/Tacoma Intl

Tue 11/12

Nonstop2h 37m

$60

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 8/28

Nonstop2h 36m

Seattle/Tacoma Intl

Wed 9/4

Nonstop2h 47m

$76

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 9/4

Nonstop2h 36m

Seattle/Tacoma Intl

Mon 9/9

Nonstop2h 45m

$78

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 9/3

Nonstop2h 36m

Seattle/Tacoma Intl

Sat 9/7

Nonstop2h 45m

$80

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 10/23

Nonstop2h 47m

Seattle/Tacoma Intl

Sun 10/27

Nonstop2h 37m

$83

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 11/6

Nonstop2h 47m

Seattle/Tacoma Intl

Fri 11/8

Nonstop2h 37m

$85

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Sat 9/7

Nonstop2h 45m

Seattle/Tacoma Intl

Tue 9/10

Nonstop2h 35m

$137

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Fri 8/23

Nonstop2h 50m

Seattle/Tacoma Intl

Wed 8/28

Nonstop2h 47m

$167

Flights are sorted by cheapest first

Deals found on 7/25

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Seattle. Price data was last updated on July 23, 2024.
To ensure you get the cheapest price possible for a flight from Ontario to Seattle, you should look to book at least 80 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
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What is the cheapest day to fly from Ontario to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Seattle. Price data was last updated on July 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to Seattle flight should consider departing on Saturday at noon when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
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Best time to book a flight from Ontario to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average temperature and rainfall totals by month.

SEA

Temperature

41 - 66.2 °F

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated July 25, 2024.
Read reviews from past customers who have flown Frontier, Alaska Airlines and Delta from Ontario to Seattle. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,365 reviews

Entertainment

7.2

Overall

8.1

Food

7.2

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Alaska Airlines
8.1
Very good
9,365 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Entertainment

7.2

Overall

8.1

Food

7.2

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Delta
8.0
Very good
9,630 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Entertainment

7.2

Overall

8.1

Food

7.2

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

United Airlines
7.4
Good
10,000 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Entertainment

7.2

Overall

8.1

Food

7.2

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Volaris
6.7
Okay
1,405 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Entertainment

7.2

Overall

8.1

Food

7.2

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Frontier
6.2
Okay
3,835 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Entertainment

7.2

Overall

8.1

Food

7.2

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 12 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 32m is how long a nonstop flight from Ontario to Seattle/Tacoma Intl typically takes.

  • Can I find flights from Ontario to Seattle for under $100 on Cheapflights?

    Yes, there are multiple flights from Ontario to Seattle for under $100. The cheapest flight booked recently is on Frontier for just $58, but on average you can expect to pay $89.

  • Are there nonstop flights from Ontario to Seattle for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from Ontario to Seattle under $100. A good price for a nonstop flight from Ontario to Seattle is less than $89.

  • Are there last-minute flights available from Ontario to Seattle for under $100?

    There are currently 20+ open flights from Ontario to Seattle within the next 7 days for less than $100.

  • What days are nonstop flights available from Ontario to Seattle?

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

  • How popular is this Ontario to Seattle flight route?

    The Ontario to Seattle/Tacoma Intl flight path was viewed by 129 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 35 flights depart from Ontario to Seattle per day.
    Early Morning (Midnight to 6am) - 9% of flight departures
    Morning (6am - Noon) - 40% of flight departures
    Afternoon (Noon - 6pm) - 20% of flight departures
    Evening (6pm - Midnight) - 31% 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 47m. Fly via Frontier to get the fastest option. There are 962 mi between Ontario and Seattle. Most flights are nonstop.

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

    Cheapflights users have booked flights from Ontario to Seattle round-trip from $58. You may be able to fly from Ontario to Seattle for 71% less than the average price by searching for this airline.

  • 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 Frontier ($42), Delta ($69), and Alaska Airlines ($79).

  • What are the most reliable airlines from Ontario to Seattle?

    Consider LATAM Airlines (100%), ITA Airways (100%) or Air France (98%) 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 $387, our data shows the cheapest flight currently is $49. When looking at the most popular route, (Ontario - Seattle/Tacoma Intl), you can expect to pay $97 for that flight.

  • What does ONT to SEA mean?

    Great question - ONT to SEA just means Ontario Airport to Seattle/Tacoma Intl Airport. Now you’ll know what these unique codes when you look for flights!

  • Can I find deals for flights from Ontario to Seattle that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to Seattle flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to Seattle with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Seattle flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Ontario to Seattle that include hotel bookings?

    Yes. In addition to deals on Ontario to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Seattle.

  • Can I find deals for business class flights from Ontario to Seattle?

    Yes. Cheapflights offers flight deals from Ontario to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Ontario to Seattle that allow pets onboard?

    Many airlines flying from Ontario to Seattle offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to Seattle?

    Yes, you can often find last-minute deals on Ontario to Seattle flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to Seattle flight deals updated?

    The Ontario to Seattle flight deals you see on this page were last updated on 7/25.

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

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

  • What is the cheapest month to book a flight from Ontario to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Seattle (average of $246). Flying from Ontario to Seattle in July is currently the most expensive (average of $412). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 7 airlines flying from Ontario to Seattle

Discover the top 7 airlines that operate flights from Ontario to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$138FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$61Average$133FlexibilityNo cancel feeOn-time65%
DeltaCheapest$84Average$226FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$89Average$210FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$90Average$229FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$176Average$262FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$270Average$338FlexibilityNo cancel feeOn-time71%
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Des Moines to Las Vegas flights
Fort Lauderdale to Boston flights
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New York to Toronto flights
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Ontario to Seoul flights

Search flights from Ontario to Seattle by cabin class

Find flights from Ontario to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
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Prem Econ Class
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Hourly flight availability from Ontario to Seattle

Find hourly flight availability from Ontario to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 25, 2024.
1%of flight departuresEarly morningMidnight to 6 am
67%of flight departuresMorning6 am to noon
22%of flight departuresAfternoonNoon to 6 pm
10%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Ontario to Seattle

Explore weekly flight availability from Ontario to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 25, 2024.
Sunday14daily flights
Monday15daily flights
Tuesday11daily flights
Wednesday10daily flights
Thursday12daily flights
Friday15daily flights
Saturday9daily flights

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