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$76+ 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
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Find cheap flights from Ontario to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Seattle/Tacoma Intl are usually found in January or February, booked 55 days in advance, depart on a Friday or Thursday and return on a Sunday

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 November 10, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$129
(Delta)

One-way from

$76
(Southwest)

Popular in

July

Cheapest in

January

Average price

$214

Good round-trip deal

$194 or less

Good one-way deal

$118 or less
Provider with most accurate pricing for Ontario-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Ontario-Seattle/Tacoma Intl flights.
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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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Highest demand for flights based on searches. 10% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Ontario to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Ontario to Seattle/Tacoma Intl.
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Find flight deals from Ontario to Seattle

Cheapest flights from Ontario to Seattle
Explore the most affordable flight options available from Ontario to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2025.

This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/134:49 pmONT - SEA
1 stop6h 36mDelta
Mon 1/57:45 pmSEA - ONT
Nonstop2h 44mDelta
Deal found 11/10$129
This Delta deal was found by Cheapflights users on 11/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/612:40 pmONT - SEA
Nonstop2h 58mDelta
Mon 12/87:11 pmSEA - ONT
1 stop4h 47mDelta
Deal found 11/9$130
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/612:40 pmONT - SEA
Nonstop2h 58mDelta
Sun 12/77:11 pmSEA - ONT
1 stop4h 47mDelta
Deal found 11/10$131
This Frontier deal was found by Cheapflights users on 11/8. 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.
Mon 12/16:01 pmONT - SEA
Nonstop2h 57mFrontier
Mon 1/1210:29 amSEA - ONT
Nonstop2h 34mFrontier
Deal found 11/8$134
This Kiwi.com deal was found by Cheapflights users on 11/9. 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.
Sat 11/226:30 amONT - SEA
1 stop6h 52mFrontier
Sun 11/232:17 pmSEA - ONT
Nonstop2h 40mFrontier
Deal found 11/9$135
This Super.com deal was found by Cheapflights users on 11/8. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/246:01 pmONT - SEA
Nonstop2h 57mFrontier
Fri 11/282:17 pmSEA - ONT
Nonstop2h 40mFrontier
Deal found 11/8$136
This CheapOair deal was found by Cheapflights users on 11/10. 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.
Fri 12/123:20 pmONT - SEA
1 stop20h 33mFrontier
Sun 12/146:18 pmSEA - ONT
1 stop26h 59mFrontier
Deal found 11/10$138
This Delta deal was found by Cheapflights users on 11/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/134:49 pmONT - SEA
1 stop6h 36mDelta
Thu 1/86:05 pmSEA - ONT
1 stop4h 33mDelta
Deal found 11/10$139
This Super.com deal was found by Cheapflights users on 11/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/192:45 pmONT - SEA
Nonstop2h 53mFrontier
Mon 12/2911:06 amSEA - ONT
Nonstop2h 36mFrontier
Deal found 11/7$141
This CheapOair deal was found by Cheapflights users on 11/9. 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.
Fri 12/123:20 pmONT - SEA
1 stop20h 33mFrontier
Mon 12/1511:01 amSEA - ONT
1 stop10h 16mFrontier
Deal found 11/9$142

Cheapflights Fare Finder

 
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 2,558,603 searches. Data last updated November 10, 2025.
Use the filters below to find and compare flights from Ontario to Seattle that are best for you.

Fly from

Ontario

Fly to

Seattle

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 12/17

5:49 pm-8:49 pm

Nonstop3h 00m

Seattle/Tacoma Intl

Tue 1/6

11:25 am-4:13 pm

1 stop4h 48m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 12/16

4:49 pm-11:25 pm

1 stop6h 36m

Seattle/Tacoma Intl

Thu 1/8

11:15 am-1:56 pm

Nonstop2h 41m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 12/4

4:49 pm-12:21 am

1 stop7h 32m

Seattle/Tacoma Intl

Tue 12/9

2:19 pm-5:07 pm

Nonstop2h 48m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sun 12/14

6:40 am-9:45 am

Nonstop3h 05m

Seattle/Tacoma Intl

Tue 1/6

5:25 am-12:16 pm

1 stop6h 51m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 1/23

3:30 pm-6:35 pm

Nonstop3h 05m

Seattle/Tacoma Intl

Mon 1/26

7:00 pm-11:58 pm

1 stop4h 58m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 12/11

5:49 pm-8:49 pm

Nonstop3h 00m

Seattle/Tacoma Intl

Mon 12/15

7:11 pm-11:58 pm

1 stop4h 47m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 12/18

5:49 pm-8:49 pm

Nonstop3h 00m

Seattle/Tacoma Intl

Sat 1/17

5:25 am-12:16 pm

1 stop6h 51m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 12/6

6:40 am-9:45 am

Nonstop3h 05m

Seattle/Tacoma Intl

Mon 12/8

7:11 pm-11:58 pm

1 stop4h 47m

$130

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 12/6

4:49 pm-11:25 pm

1 stop6h 36m

Seattle/Tacoma Intl

Sun 12/7

8:30 am-11:13 am

Nonstop2h 43m

$131

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 1/9

11:10 am-4:00 pm

1 stop4h 50m

$76

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/8

Showing 1-10 of 19 results
1
2

Compare providers for flights from Ontario to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Seattle in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Seattle flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Seattle flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Seattle flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Seattle

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 November 7, 2025.

To ensure you get the cheapest price possible for a flight from Ontario to Seattle, you should look to book at least 55 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.

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 $38). Flying from Ontario to Seattle in July is currently the most expensive (average of $134). 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.

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

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 November 10, 2025.

It’s typically best to fly out from Ontario to Seattle in the morning. Doing so could potentially save you 15% on the flight price compared to flying at noon, which is usually more expensive.

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 November 2, 2025.

Travelers seeking maximum savings on their Ontario to Seattle flight should consider departing on Friday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Ontario to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Seattle trip
Airlines
Frontier

Frontier offers extra comfort seats with 32” separation for a fee, ideal for taller passengers.


Frontier's Board First option allows early boarding for carry-on bag purchasers and elite members.

Read more about Frontierby Marisa Garcia
Alaska Airlines

Alaska Airlines offers Wi-Fi for a flat fee, ideal for business travelers needing connectivity.


Alaska's Premium Class offers extra legroom and free cocktails, enhancing comfort on short flights.

Read more about Alaska Airlinesby Robert Schrader
Airports
ONT

ONT offers quick security checks compared to LAX, making it ideal for business travelers seeking efficiency.

Read more about ONTby Bill Fink
SEA

Use the Link light rail for a cost-effective trip to downtown Seattle, taking less than 40 minutes from SEA.

Read more about SEAby Brandon Schultz
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

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 November 10, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Ontario to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,268 reviews

Entertainment

7.0

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
11,268 reviews
Alaska Airlines
8.0
Very good
11,268 reviews

Entertainment

7.0

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Southwest
8.0
Very good
4,235 reviews
Alaska Airlines
8.0
Very good
11,268 reviews

Entertainment

7.0

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
7.9
Good
8,006 reviews
Alaska Airlines
8.0
Very good
11,268 reviews

Entertainment

7.0

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Hawaiian Airlines
7.8
Good
2,806 reviews
Alaska Airlines
8.0
Very good
11,268 reviews

Entertainment

7.0

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Frontier
5.8
Fair
3,114 reviews
Alaska Airlines
8.0
Very good
11,268 reviews

Entertainment

7.0

Crew

8.5

Food

7.1

Comfort

7.8

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

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 14 flights from Ontario (ONT) to Seattle/Tacoma Intl (SEA) per day to choose from. Flights to Seattle from Ontario are available from 5 different airlines, which means you should have some options if you want to compare airfare deals. 2h 42m is how long a nonstop flight from Ontario to Seattle/Tacoma Intl typically takes.

  • How popular is this Ontario to Seattle flight route?

    The Ontario to Seattle/Tacoma Intl flight path was viewed by 228 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Seattle?

    There are many flights that can get you from Ontario to Seattle in 3h. Fly via Delta to get the fastest option. There are 956 mi between Ontario and Seattle. Most flights are nonstop.

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

    Cheapflights users have booked flights from Ontario to Seattle round-trip from $83. Other airlines that can offer you cheap pricing are Hawaiian Airlines, from $98, and Delta, from $120. You may be able to fly from Ontario to Seattle for 60% less than the average price by searching for these airlines.

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

    Consider Virgin Atlantic (98%), KLM (97%) or SkyWest Airlines (97%) 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 $499, our data shows the cheapest flight currently is $60. When looking at the most popular route, (Ontario - Seattle/Tacoma Intl), you can expect to pay $59 for that flight.

  • 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.

  • 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 $38). Flying from Ontario to Seattle in July is currently the most expensive (average of $134). 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.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Tukwila
Lakewood
Olympia
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Kirkland
Lacey
Kent
Cle Elum
Marysville
Puyallup
Federal Way
Fife
Issaquah
Aberdeen

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Top 5 airlines flying from Ontario to Seattle

Discover the top 5 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 2,558,603 searches. Data last updated November 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$83Average$174FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$98Average$248FlexibilityNo cancel feeOn-time85%
DeltaCheapest$120Average$256FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$150Average$266FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$150Average$256FlexibilityNo cancel feeOn-time63%

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