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$50+ Cheap flights from Washington to Ontario (ONT)

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
abr 5 — abr 121
sáb 4/5
sáb 4/12
1 adult, Economy
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Cheap flight deals from Washington to Ontario

Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated março 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$98
(Cheapflightsfares)

One-way from

$50
(CheapOair)

Popular in

November

Cheapest in

January

Average price

$217

Good round-trip deal

$155 or less

Good one-way deal

$91 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Los Angeles flights.
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From Washington to Ontario
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One-way flight from Washington to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Washington to Ontario.
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Price to beat on a one-way flight from Washington to Ontario.
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Find flight deals from Washington to Ontario

Cheapest flights from Washington to Ontario
Explore the most affordable flight options available from Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on março 31, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 3/30. 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.
qui 5/16:50 pmSEA - ONT
Nonstop2h 35mFrontier
dom 5/44:29 pmONT - SEA
Nonstop3h 03mFrontier
Deal found 3/30$98
This Trip.com deal was found by Cheapflights users on 3/31. 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.
sáb 5/35:55 pmSEA - ONT
Nonstop2h 34mMultiple Airlines
dom 5/44:29 pmONT - SEA
Nonstop3h 03mMultiple Airlines
Deal found 3/31$150
This Cheapflightsfares deal was found by Cheapflights users on 3/30. 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.
qua 6/1811:13 amPDX - ONT
Nonstop2h 22mFrontier
ter 6/242:30 pmONT - PDX
Nonstop2h 25mFrontier
Deal found 3/30$158
This Expedia deal was found by Cheapflights users on 3/31. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 5/2911:04 amPDX - ONT
Nonstop2h 20mMultiple Airlines
qua 6/45:55 pmONT - PDX
Nonstop2h 31mMultiple Airlines
Deal found 3/31$164
This Hawaiian Airlines deal was found by Cheapflights users on 3/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 4/238:13 amSEA - ONT
Nonstop2h 38mHawaiian Airlines
qua 4/234:29 pmONT - SEA
Nonstop2h 41mHawaiian Airlines
Deal found 3/30$171
This iWofly deal was found by Cheapflights users on 3/30. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 4/295:55 pmSEA - ONT
Nonstop2h 34mAlaska Airlines
ter 5/611:46 amONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 3/30$172
This Hawaiian Airlines deal was found by Cheapflights users on 3/31. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 4/297:00 amPDX - ONT
Nonstop2h 16mHawaiian Airlines
ter 5/68:59 pmONT - PDX
Nonstop2h 21mHawaiian Airlines
Deal found 3/31$177
This United Airlines deal was found by Cheapflights users on 3/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 5/217:54 amPDX - ONT
1 stop4h 30mUnited Airlines
dom 5/256:00 amONT - PDX
1 stop6h 33mUnited Airlines
Deal found 3/31$182
This Delta deal was found by Cheapflights users on 3/31. 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.
qua 4/232:00 pmSEA - ONT
Nonstop2h 44mDelta
sáb 4/265:45 amONT - SEA
Nonstop2h 57mDelta
Deal found 3/31$187
This Alaska Airlines deal was found by Cheapflights users on 3/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 4/299:42 pmPDX - ONT
Nonstop2h 16mAlaska Airlines
qua 5/76:00 amONT - PDX
1 stop4h 52mAlaska Airlines
Deal found 3/31$187
This Southwest deal was found by Cheapflights users on 3/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 5/146:45 amPDX - ONT
1 stop3h 25mSouthwest
seg 5/196:20 pmONT - PDX
1 stop3h 55mSouthwest
Deal found 3/31$212
This United Airlines deal was found by Cheapflights users on 3/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 5/276:20 amGEG - ONT
1 stop5h 54mUnited Airlines
qui 5/296:41 pmONT - GEG
1 stop4h 33mUnited Airlines
Deal found 3/30$221

Cheapflights Fare Finder

Customize your flight search to find flights from Washington to Ontario 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 março 31, 2025.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Washington

Fly to

Ontario

Route

Depart

Return

Price

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

qui 5/1

6:50 pm-9:25 pm

Nonstop2h 35m

Ontario

dom 5/4

4:29 pm-7:32 pm

Nonstop3h 03m

$98

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

sáb 5/3

5:55 pm-8:29 pm

Nonstop2h 34m

Ontario

dom 5/4

4:29 pm-7:32 pm

Nonstop3h 03m

$150

PortlandOntario

PDX - ONT

PDXONT

Portland

qua 6/18

11:13 am-1:35 pm

Nonstop2h 22m

Ontario

ter 6/24

2:30 pm-4:55 pm

Nonstop2h 25m

$158

PortlandOntario

PDX - ONT

PDXONT

Portland

qui 5/29

11:04 am-1:24 pm

Nonstop2h 20m

Ontario

qua 6/4

5:55 pm-8:26 pm

Nonstop2h 31m

$164

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

qua 4/23

8:13 am-10:51 am

Nonstop2h 38m

Ontario

qua 4/23

4:29 pm-7:10 pm

Nonstop2h 41m

$171

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

ter 4/29

5:55 pm-8:29 pm

Nonstop2h 34m

Ontario

ter 5/6

11:46 am-2:31 pm

Nonstop2h 45m

$172

PortlandOntario

PDX - ONT

PDXONT

Portland

ter 4/29

7:00 am-9:16 am

Nonstop2h 16m

Ontario

ter 5/6

8:59 pm-11:20 pm

Nonstop2h 21m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

qua 5/21

7:54 am-12:24 pm

1 stop4h 30m

Ontario

dom 5/25

6:00 am-12:33 pm

1 stop6h 33m

$182

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

qua 4/23

11:15 am-1:55 pm

Nonstop2h 40m

Ontario

qui 5/1

2:35 pm-5:25 pm

Nonstop2h 50m

$187

PortlandOntario

PDX - ONT

PDXONT

Portland

ter 4/29

9:42 pm-11:58 pm

Nonstop2h 16m

Ontario

qua 5/7

6:00 am-10:52 am

1 stop4h 52m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/30

Showing 1-10 of 55 results
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Best time to book a flight from Washington to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $246). Flying from State of Washington to Ontario in March is currently the most expensive (average of $326). 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 WA to ONT?

Find hourly flight availability from Washington to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated março 31, 2025.

When flying from State of Washington to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to Ontario

Explore weekly flight availability from Washington to Ontario. 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 março 31, 2025.

The most flights from USWA to ONT are scheduled on a Monday (19 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated março 31, 2025.
To help decide which airline to fly from Washington to Ontario, see what other customers have to say about Alaska Airlines, Southwest and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Southwest
8.0
Very good
4,275 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Hawaiian Airlines
7.9
Good
2,344 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
United Airlines
7.4
Good
8,614 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Related info for your journey

Find useful and relevant information for your journey from Washington to Ontario. 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 into for flights to Ontario from Washington?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Washington. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

    Flights from Washington to Ontario have been viewed 70 times in the past calendar month.

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

    One-way options have recently been found by users for as low as $50 on Frontier. Other airlines that offer cheap prices include United Airlines from $84 and Delta from $89 one-way.

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

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

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

    The top 3 most reliable airlines when flying from State of Washington to Ontario are WestJet (94%), Korean Air (87%) and KLM (87%).

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

    The cheapest flight price from State of Washington to Ontario is $44. On average you can expect to pay $248. The most popular route, (Seattle/Tacoma Intl - Ontario), can usually be booked for $113.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $246). Flying from State of Washington to Ontario in March is currently the most expensive (average of $326). 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 Washington to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Washington to Ontario

Discover the top 7 airlines that operate flights from Washington to Ontario. 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 março 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$40Average$100FlexibilityNo cancel feeOn-time65%
FrontierCheapest$56Average$133FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$95Average$248FlexibilityNo cancel feeOn-time85%
DeltaCheapest$117Average$310FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$136Average$448FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$196Average$358FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$308Average$473FlexibilityNo cancel feeOn-time69%
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