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$64+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$114
(CheapOair)

One-way from

$64
(Cheapflightsfares)

Popular in

July

Cheapest in

January

Average price

$237

Good round-trip deal

$181 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. 15% potential increase in price ($37 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 September 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 September 16, 2025.

This Priceline deal was found by Cheapflights users on 9/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/248:32 amONT - PDX
Nonstop2h 26mFrontier
Mon 10/277:30 pmPDX - ONT
Nonstop2h 22mFrontier
Deal found 9/14$114
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/178:32 amONT - PDX
Nonstop2h 26mFrontier
Sun 10/197:30 pmPDX - ONT
Nonstop2h 22mFrontier
Deal found 9/14$115
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 10/38:43 amONT - SEA
Nonstop2h 58mFrontier
Mon 10/612:30 pmSEA - ONT
Nonstop2h 48mFrontier
Deal found 9/15$118
This CheapOair deal was found by Cheapflights users on 9/14. 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 10/176:05 amONT - PDX
1 stop12h 35mFrontier
Mon 10/207:30 pmPDX - ONT
Nonstop2h 22mFrontier
Deal found 9/14$120
This Frontier deal was found by Cheapflights users on 9/15. 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 9/298:07 amONT - PDX
Nonstop2h 26mFrontier
Mon 10/67:17 pmPDX - ONT
Nonstop2h 21mFrontier
Deal found 9/15$121
This Frontier deal was found by Cheapflights users on 9/14. 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 11/98:02 amONT - SEA
Nonstop2h 53mFrontier
Mon 11/107:17 pmSEA - ONT
Nonstop2h 41mFrontier
Deal found 9/14$121
This Mytrip deal was found by Cheapflights users on 9/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/112:05 pmONT - SEA
1 stop25h 08mFrontier
Sun 11/27:17 pmSEA - ONT
Nonstop2h 41mFrontier
Deal found 9/16$122
This CheapOair deal was found by Cheapflights users on 9/13. 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.
Thu 9/256:00 amONT - SEA
1 stop9h 31mFrontier
Fri 9/2612:30 pmSEA - ONT
Nonstop2h 48mFrontier
Deal found 9/13$123
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/88:00 amONT - SEA
1 stop10h 32mFrontier
Sun 11/97:17 pmSEA - ONT
Nonstop2h 41mFrontier
Deal found 9/14$124
This Frontier deal was found by Cheapflights users on 9/13. 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.
Mon 10/138:32 amONT - PDX
Nonstop2h 26mFrontier
Thu 10/1612:43 pmPDX - ONT
1 stop11h 07mFrontier
Deal found 9/13$125
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 10/38:43 amONT - SEA
Nonstop2h 58mFrontier
Fri 10/178:28 amSEA - ONT
Nonstop2h 40mFrontier
Deal found 9/15$125
This Frontier deal was found by Cheapflights users on 9/13. 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.
Fri 10/108:32 amONT - PDX
Nonstop2h 26mFrontier
Fri 10/177:30 pmPDX - ONT
Nonstop2h 22mFrontier
Deal found 9/13$126

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 September 16, 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

Sat 11/15

11:46 am-7:19 pm

1 stop7h 33m

Portland

Wed 11/19

5:26 pm-10:55 pm

1 stop5h 29m

$151

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 10/28

6:40 am-11:55 am

1 stop5h 15m

Portland

Tue 11/4

6:40 am-10:35 am

1 stop3h 55m

$151

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 10/28

7:35 am-2:38 pm

1 stop7h 03m

Portland

Tue 11/4

5:00 pm-9:20 pm

1 stop4h 20m

$157

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 10/8

1:15 pm-6:09 pm

1 stop4h 54m

Portland

Sat 10/11

5:00 pm-9:20 pm

1 stop4h 20m

$167

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 10/3

8:07 am-10:33 am

Nonstop2h 26m

Portland

Thu 10/9

12:43 pm-11:50 pm

1 stop11h 07m

$169

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 10/11

5:45 pm-8:03 pm

Nonstop2h 18m

Portland

Wed 10/15

9:30 pm-11:51 pm

Nonstop2h 21m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 11/4

10:59 am-1:25 pm

Nonstop2h 26m

Portland

Sat 11/8

2:46 pm-5:05 pm

Nonstop2h 19m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 11/15

7:20 am-9:50 am

Nonstop2h 30m

Portland

Wed 11/19

9:32 pm-11:56 pm

Nonstop2h 24m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 10/28

7:20 am-9:50 am

Nonstop2h 30m

Portland

Tue 11/4

2:46 pm-5:09 pm

Nonstop2h 23m

$177

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 11/19

4:11 pm-6:59 pm

Nonstop2h 48m

Seattle/Tacoma Intl

Sat 11/22

7:15 am-9:55 am

Nonstop2h 40m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 $387). 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 September 16, 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 September 16, 2025.

The most flights from ONT to USWA are scheduled on a Monday (18 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (5 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 September 16, 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

Comfort

7.8

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
8.0
Very good
7,957 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
2,724 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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
3,174 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Overall

8.0

Crew

8.5

Boarding

8.1

Food

7.1

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 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 251 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 State of Washington?

    For as low as $177, Delta can have you in State of Washington from Ontario in 2h 48m. Ontario and State of Washington are separated by a distance of 956 mi. This flight may include one or multiple stops.

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

    For one-way options, check prices for Delta. According to our data, you can fly for as low as $76. Users have also found prices from $89 and $94 on United Airlines and Southwest, 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: Scandinavian Airlines (95%), Japan Airlines (95%), Frontier( 95%).

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

    Looking at all options, your cheapest flight can be booked for $69. While the most popular route (Ontario - Seattle/Tacoma Intl) can be booked for $69 on average, our data indicates $392 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 $387). 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

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Alternative routes for Ontario to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$77Average$168FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$98Average$315FlexibilityNo cancel feeOn-time85%
DeltaCheapest$117Average$261FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$149Average$381FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$150Average$313FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$233Average$401FlexibilityNo cancel feeOn-time69%

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