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$70+ Cheap flights from Ontario (ONT) to Washington

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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Ontario to Washington

Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated August 14, 2025.

Round-trip from

$110
(CheapOair)

One-way from

$72
(Frontier)

Popular in

July

Cheapest in

January

Average price

$247

Good round-trip deal

$178 or less

Good one-way deal

$124 or less
From Ontario to Washington
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One-way flight from Ontario to Washington
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Highest demand for flights based on searches. 17% potential increase in price ($44 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Ontario to Washington.
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Price to beat on a one-way flight from Ontario to Washington.
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Find flight deals from Ontario to Washington

Cheapest flights from Ontario to Washington
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This CheapOair deal was found by Cheapflights users on 8/13. 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 9/58:07 amONT - PDX
Nonstop2h 26mFrontier
Sun 9/711:23 amPDX - ONT
1 stop19h 54mFrontier
Deal found 8/13$110
This CheapOair deal was found by Cheapflights users on 8/14. 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 10/34:08 pmONT - PDX
1 stop8h 04mFrontier
Sun 10/57:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 8/14$112
This Frontier deal was found by Cheapflights users on 8/14. 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.
Thu 9/49:16 amONT - PDX
1 stop9h 16mFrontier
Mon 9/87:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 8/14$115
This Frontier deal was found by Cheapflights users on 8/13. 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.
Sun 9/218:07 amONT - PDX
Nonstop2h 26mFrontier
Tue 9/307:15 amPDX - ONT
1 stop12h 39mFrontier
Deal found 8/13$116
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/68:59 pmONT - PDX
1 stop27h 13mFrontier
Sun 9/147:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 8/14$123
This CheapOair deal was found by Cheapflights users on 8/13. 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 9/128:07 amONT - PDX
Nonstop2h 26mFrontier
Sun 9/1411:23 amPDX - ONT
1 stop19h 54mFrontier
Deal found 8/13$125
This Frontier deal was found by Cheapflights users on 8/13. 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.
Sun 8/248:18 amONT - PDX
Nonstop2h 24mFrontier
Mon 9/811:23 amPDX - ONT
1 stop9h 33mFrontier
Deal found 8/13$128
This Frontier deal was found by Cheapflights users on 8/14. 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.
Sun 8/248:18 amONT - PDX
Nonstop2h 24mFrontier
Thu 8/2812:18 pmPDX - ONT
1 stop11h 32mFrontier
Deal found 8/14$129
This Cheapflightsfares deal was found by Cheapflights users on 8/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/58:07 amONT - PDX
Nonstop2h 26mFrontier
Mon 9/87:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 8/12$131
This Frontier deal was found by Cheapflights users on 8/13. 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.
Thu 10/29:16 amONT - PDX
1 stop9h 16mFrontier
Mon 10/67:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 8/13$132
This FlightHub deal was found by Cheapflights users on 8/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:07 amONT - PDX
Nonstop2h 26mFrontier
Mon 9/297:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 8/11$134
This Booking.com deal was found by Cheapflights users on 8/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2412:59 amONT - SEA
1 stop8h 35mFrontier
Wed 8/278:42 pmSEA - ONT
Nonstop2h 42mFrontier
Deal found 8/13$138

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Washington 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 August 14, 2025.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.

Fly from

Ontario

Fly to

Washington

Route

Depart

Return

Price

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 9/19

8:07 am-10:33 am

Nonstop2h 26m

Portland

Mon 9/22

11:23 am-8:56 pm

1 stop9h 33m

$110

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 9/12

8:07 am-10:33 am

Nonstop2h 26m

Portland

Sun 9/14

11:23 am-7:17 am

1 stop19h 54m

$110

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 9/5

8:07 am-10:33 am

Nonstop2h 26m

Portland

Sun 9/7

11:23 am-7:17 am

1 stop19h 54m

$110

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 10/23

6:54 pm-6:40 pm

1 stop23h 46m

Portland

Sun 10/26

7:30 pm-9:52 pm

Nonstop2h 22m

$110

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 9/19

8:07 am-10:33 am

Nonstop2h 26m

Portland

Mon 9/29

6:05 am-7:54 pm

1 stop13h 49m

$112

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 9/4

9:16 am-6:32 pm

1 stop9h 16m

Portland

Sun 9/7

7:17 pm-9:38 pm

Nonstop2h 21m

$115

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 9/25

9:16 am-6:32 pm

1 stop9h 16m

Portland

Mon 9/29

7:17 pm-9:38 pm

Nonstop2h 21m

$115

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sun 9/21

8:07 am-10:33 am

Nonstop2h 26m

Portland

Mon 9/29

11:23 am-8:56 pm

1 stop9h 33m

$115

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 9/22

8:07 am-10:33 am

Nonstop2h 26m

Portland

Mon 9/29

11:23 am-8:56 pm

1 stop9h 33m

$115

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 9/22

8:07 am-10:33 am

Nonstop2h 26m

Portland

Wed 10/1

7:15 am-7:54 pm

1 stop12h 39m

$116

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington 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 Washington

What is the cheapest month to book a flight from Ontario to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $238). Flying from Ontario to State of Washington in June is currently the most expensive (average of $389). 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 WA?

Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to State of Washington as you normally would.

Weekly flight availability from Ontario to State of Washington

Explore weekly flight availability from Ontario to Washington. 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 August 14, 2025.

The most flights from ONT to USWA are scheduled on a Thursday (24 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (12 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated August 14, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Ontario to Washington by reading reviews from past customers. 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
10,000 reviews

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Southwest
8.0
Very good
4,244 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Hawaiian Airlines
7.8
Good
2,656 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Frontier
5.8
Fair
3,217 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Overall

8.0

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

Related info for your journey

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

  • What airport do you fly from for flights from Ontario to Washington?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Washington from Ontario.

  • How popular is this Ontario to State of Washington flight route?

    This flight path from Ontario to Washington was viewed by 222 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Ontario to State of Washington one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $72. Users have also found prices from $98 and $118 on Alaska Airlines and Hawaiian Airlines, respectively.

  • What are the most popular routes from Ontario to State of Washington?

    While some choose either Ontario - Portland or Ontario - Spokane, Ontario - Seattle/Tacoma Intl is the most popular route from Ontario to State of Washington.

  • What are the most reliable airlines from Ontario to State of Washington?

    Before booking your flight to State of Washington from Ontario, check out the most reliable airlines to get you to your destination on time: WestJet (93%), Scandinavian Airlines (93%), Korean Air( 92%).

  • What are the cheapest flights from Ontario to State of Washington?

    Looking at all options, your cheapest flight can be booked for $97. While the most popular route (Ontario - Seattle/Tacoma Intl) can be booked for $75 on average our data indicates $358 when flying from Ontario to State of Washington.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Washington 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 State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $238). Flying from Ontario to State of Washington in June is currently the most expensive (average of $389). 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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Alternative routes for Ontario to Washington

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Top 6 airlines flying from Ontario to Washington

Discover the top 6 airlines that operate flights from Ontario to Washington. 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$72Average$164FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$98Average$301FlexibilityNo cancel feeOn-time85%
DeltaCheapest$116Average$262FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$139Average$382FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$150Average$325FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$233Average$465FlexibilityNo cancel feeOn-time69%

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