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$44+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
feb. 25 — mar. 41
mar. 2/25
mar. 3/4
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 febrero 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$94
(Frontier)

One-way from

$44
(Cheapflightsfares)

Popular in

April

Cheapest in

January

Average price

$218

Good round-trip deal

$120 or less

Good one-way deal

$103 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 ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in February 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 febrero 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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.
vie. 4/412:46 pmSEA - ONT
Nonstop2h 39mFrontier
lun. 4/710:12 amONT - SEA
Nonstop2h 54mFrontier
Deal found 2/20$95
This Trip.com deal was found by Cheapflights users on 2/20. 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.
jue. 3/138:49 pmSEA - ONT
Nonstop2h 35mHawaiian Airlines
lun. 3/176:00 amONT - SEA
Nonstop2h 50mHawaiian Airlines
Deal found 2/20$107
This Delta deal was found by Cheapflights users on 2/20. 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.
mié. 4/237:59 pmSEA - ONT
Nonstop2h 43mDelta
dom. 4/275:45 amONT - SEA
Nonstop2h 55mDelta
Deal found 2/20$117
This Frontier deal was found by Cheapflights users on 2/20. 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.
vie. 6/62:54 pmPDX - ONT
Nonstop2h 21mFrontier
lun. 6/911:28 amONT - PDX
Nonstop2h 26mFrontier
Deal found 2/20$143
This Southwest deal was found by Cheapflights users on 2/19. 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.
mar. 4/223:55 pmSEA - ONT
1 stop5h 45mSouthwest
vie. 4/255:45 amONT - SEA
1 stop4h 30mSouthwest
Deal found 2/19$146
This Expedia deal was found by Cheapflights users on 2/18. 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.
jue. 3/1312:52 pmSEA - ONT
Nonstop2h 37mMultiple Airlines
lun. 3/177:00 amONT - SEA
1 stop5h 16mMultiple Airlines
Deal found 2/18$148
This lastminute.com deal was found by Cheapflights users on 2/20. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/77:05 amPDX - ONT
Nonstop2h 23mHawaiian Airlines
mar. 4/1510:18 amONT - PDX
Nonstop2h 27mHawaiian Airlines
Deal found 2/20$152
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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.
lun. 3/178:49 pmSEA - ONT
Nonstop2h 35mAlaska Airlines
mié. 4/96:00 amONT - SEA
Nonstop2h 50mAlaska Airlines
Deal found 2/18$167
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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.
vie. 4/49:41 pmPDX - ONT
Nonstop2h 18mAlaska Airlines
mar. 4/87:00 amONT - PDX
Nonstop2h 24mAlaska Airlines
Deal found 2/19$167
This Travelocity deal was found by Cheapflights users on 2/20. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/279:41 pmPDX - ONT
Nonstop2h 16mMultiple Airlines
vie. 5/3011:28 amONT - PDX
Nonstop2h 26mMultiple Airlines
Deal found 2/20$168
This Southwest deal was found by Cheapflights users on 2/20. 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.
mar. 3/184:30 pmPDX - ONT
1 stop3h 30mSouthwest
mié. 3/192:00 pmONT - PDX
2 stops7h 40mSouthwest
Deal found 2/20$182
This Delta deal was found by Cheapflights users on 2/20. 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.
lun. 3/105:10 pmPDX - ONT
1 stop5h 12mDelta
vie. 3/215:30 pmONT - PDX
1 stop6h 29mDelta
Deal found 2/20$190

Find flights from Washington to Ontario within your budget

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 febrero 20, 2025.

Fly from

Washington

Fly to

Ontario

Route

Depart

Return

Price

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

vie. 4/4

12:46 pm-3:25 pm

Nonstop2h 39m

Ontario

lun. 4/7

10:12 am-1:06 pm

Nonstop2h 54m

$95

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

jue. 3/13

8:49 pm-11:24 pm

Nonstop2h 35m

Ontario

lun. 3/17

6:00 am-8:50 am

Nonstop2h 50m

$107

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

mié. 4/23

7:59 pm-10:42 pm

Nonstop2h 43m

Ontario

dom. 4/27

5:45 am-8:40 am

Nonstop2h 55m

$117

PortlandOntario

PDX - ONT

PDXONT

Portland

vie. 6/6

2:54 pm-5:15 pm

Nonstop2h 21m

Ontario

lun. 6/9

11:28 am-1:54 pm

Nonstop2h 26m

$143

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

mar. 4/22

3:55 pm-9:40 pm

1 stop5h 45m

Ontario

vie. 4/25

5:45 am-10:15 am

1 stop4h 30m

$146

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

mié. 4/30

8:13 am-10:51 am

Nonstop2h 38m

Ontario

vie. 5/9

6:24 pm-9:00 pm

Nonstop2h 36m

$147

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

jue. 3/13

12:52 pm-3:29 pm

Nonstop2h 37m

Ontario

dom. 3/16

7:00 am-11:27 am

1 stop4h 27m

$148

PortlandOntario

PDX - ONT

PDXONT

Portland

lun. 4/7

7:05 am-9:28 am

Nonstop2h 23m

Ontario

mar. 4/15

10:18 am-12:45 pm

Nonstop2h 27m

$152

PortlandOntario

PDX - ONT

PDXONT

Portland

vie. 4/4

9:41 pm-11:59 pm

Nonstop2h 18m

Ontario

mar. 4/8

7:00 am-9:24 am

Nonstop2h 24m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

mar. 5/27

9:41 pm-11:57 pm

Nonstop2h 16m

Ontario

vie. 5/30

11:28 am-1:54 pm

Nonstop2h 26m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 60 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.

Travel insights for flights from Washington to Ontario

Get recent, data-driven insights about flights from Washington to Ontario including ideal travel times, pricing trends, and more.

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 $315). 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 febrero 20, 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 febrero 20, 2025.

The most flights from USWA to ONT are scheduled on a Thursday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 febrero 20, 2025.
To help decide which airline to fly from Washington to Ontario, see what other customers have to say about Southwest, Alaska Airlines and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Comfort

8.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

Food

7.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Comfort

8.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

Food

7.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Comfort

8.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

Food

7.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Comfort

8.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

Food

7.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Comfort

8.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

Food

7.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Comfort

8.1

Entertainment

7.6

Overall

8.1

Boarding

8.2

Food

7.1

Reviews

1 / 20

8.0
Excellent

Christine,Aug 2024

DEN - LGB

No issues. I needed pre boarding and I was able to get it without issue

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 72 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 $44 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $59 and Delta from $69 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 Aeromexico (100%), WestJet (90%) and SkyWest Airlines (90%).

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

    The cheapest flight price from State of Washington to Ontario is $41. On average you can expect to pay $164. The most popular route, (Seattle/Tacoma Intl - Ontario), can usually be booked for $78.

  • 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 $315). 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 Washington to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Washington to Ontario

Discover the top 6 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 febrero 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$40Average$119FlexibilityNo cancel feeOn-time65%
FrontierCheapest$56Average$131FlexibilityNo cancel feeOn-time62%
DeltaCheapest$116Average$312FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$135Average$380FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$196Average$392FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$264Average$521FlexibilityNo cancel feeOn-time69%
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