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$49+ Cheap flights from North America 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
juin 17 — juin 241
mar. 6/17
mar. 6/24
1 adult, Economy
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Cheap flight deals from North America to Ontario

Keep the following information in mind while searching for North America to Ontario flight deals. Data was last updated juin 12, 2025.

Round-trip from

$57
(United Airlines)

One-way from

$49
(Southwest)

Popular in

December

Cheapest in

September

Average price

$383

Good round-trip deal

$58 or less

Good one-way deal

$39 or less
From North America to Ontario
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One-way flight from North America to Ontario
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Highest demand for flights based on searches. 7% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from North America to Ontario.
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Price to beat on a one-way flight from North America to Ontario.
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Find flight deals from North America to Ontario

Cheapest flights from North America to Ontario
Explore the most affordable flight options available from North America to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on juin 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 7/1110:45 amSFO - ONT
Nonstop1h 29mUnited Airlines
sam. 7/191:19 pmONT - SFO
Nonstop1h 27mUnited Airlines
Deal found 6/10$57
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 7/1110:11 pmSFO - ONT
Nonstop1h 29mFrontier
lun. 7/149:41 pmONT - SFO
Nonstop1h 33mFrontier
Deal found 6/12$89
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/86:30 amSJC - ONT
Nonstop1h 25mSouthwest
mar. 9/96:20 pmONT - SJC
Nonstop1h 15mSouthwest
Deal found 6/11$97
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/81:42 pmSEA - ONT
Nonstop2h 54mFrontier
sam. 7/1210:03 amONT - SEA
Nonstop2h 50mFrontier
Deal found 6/11$126
This Kiwi.com deal was found by Cheapflights users on 6/9. 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.
mar. 8/127:00 amIAH - ONT
1 stop18h 50mFrontier
ven. 8/226:00 amONT - IAH
1 stop8h 31mFrontier
Deal found 6/9$157
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/85:15 amSFO - ONT
2 stops7h 05mSouthwest
lun. 9/82:15 pmONT - SFO
2 stops9h 05mSouthwest
Deal found 6/11$161
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 8/77:00 pmSJC - ONT
1 stop16h 53mFrontier
lun. 8/116:00 amONT - SJC
1 stop7h 17mFrontier
Deal found 6/12$167
This Hawaiian Airlines deal was found by Cheapflights users on 6/10. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 9/105:20 amSEA - ONT
1 stop4h 06mHawaiian Airlines
sam. 9/136:00 amONT - SEA
Nonstop2h 45mHawaiian Airlines
Deal found 6/10$187
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 7/55:32 amSFO - ONT
1 stop6h 28mAmerican Airlines
sam. 7/126:53 pmONT - SFO
1 stop4h 49mAmerican Airlines
Deal found 6/11$187
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/212:35 pmSEA - ONT
Nonstop2h 42mDelta
jeu. 4/26:45 amONT - SEA
Nonstop3h 04mDelta
Deal found 6/11$217
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 8/157:50 amHOU - ONT
Nonstop3h 15mSouthwest
mar. 8/195:25 amONT - HOU
Nonstop3h 10mSouthwest
Deal found 6/10$217
This Frontier deal was found by Cheapflights users on 6/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/296:59 amJFK - ONT
1 stop12h 21mFrontier
mer. 8/67:22 pmONT - JFK
1 stop7h 08mFrontier
Deal found 6/12$234

Cheapflights Fare Finder

Customize your flight search to find flights from North America 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 juin 12, 2025.
Use the filters below to find and compare flights from North America to Ontario that are best for you.

Fly from

North America

Fly to

Ontario

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

ven. 7/11

10:45 am-12:14 pm

Nonstop1h 29m

Ontario

sam. 7/19

1:19 pm-2:46 pm

Nonstop1h 27m

$57

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

ven. 7/11

10:11 pm-11:40 pm

Nonstop1h 29m

Ontario

lun. 7/14

9:41 pm-11:14 pm

Nonstop1h 33m

$89

San JoseOntario

SJC - ONT

SJCONT

San Jose

lun. 9/8

6:30 am-7:55 am

Nonstop1h 25m

Ontario

mar. 9/9

6:20 pm-7:35 pm

Nonstop1h 15m

$97

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

mar. 7/8

1:42 pm-4:36 pm

Nonstop2h 54m

Ontario

sam. 7/12

10:03 am-12:53 pm

Nonstop2h 50m

$126

HoustonOntario

IAH - ONT

IAHONT

Houston George Bush Intcntl

mar. 8/12

7:00 am-11:50 pm

1 stop18h 50m

Ontario

ven. 8/22

6:00 am-4:31 pm

1 stop8h 31m

$157

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

lun. 9/8

5:15 am-12:20 pm

2 stops7h 05m

Ontario

lun. 9/8

2:15 pm-11:20 pm

2 stops9h 05m

$161

San JoseOntario

SJC - ONT

SJCONT

San Jose

jeu. 8/7

7:00 pm-11:53 am

1 stop16h 53m

Ontario

lun. 8/11

6:00 am-1:17 pm

1 stop7h 17m

$167

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

mer. 9/10

5:20 am-9:26 am

1 stop4h 06m

Ontario

sam. 9/13

6:00 am-8:45 am

Nonstop2h 45m

$187

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

sam. 7/5

5:32 am-12:00 pm

1 stop6h 28m

Ontario

sam. 7/12

6:53 pm-11:42 pm

1 stop4h 49m

$187

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

mer. 9/10

8:25 am-2:40 pm

1 stop6h 15m

Ontario

sam. 9/13

3:15 pm-9:30 pm

1 stop6h 15m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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

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

What is the cheapest month to book a flight from North America to Ontario?

Currently, August is the cheapest month in which you can book a flight from North America to Ontario (average of $246). Flying from North America to Ontario in March is currently the most expensive (average of $328). 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 NA to ONT?

Find hourly flight availability from North America 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 juin 12, 2025.

When flying from North America 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.

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 juin 12, 2025.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from North America 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 North America?

    If you book a flight to Ontario from North America, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • What are the cheapest airlines to fly from North America to Ontario one-way?

    The cheapest airlines for a one-way flight from North America to Ontario are Southwest ($49), Frontier ($54), and United Airlines ($60).

  • What are the most popular routes from North America to Ontario?

    The most popular flight routes from North America to Ontario are New York John F Kennedy Intl - Ontario, San Francisco - Ontario and Newark - Ontario.

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

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

  • How can I find direct flights from North America to Ontario?

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

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

    Yes. Cheapflights offers flight deals from North America 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 North America to Ontario?

    Currently, August is the cheapest month in which you can book a flight from North America to Ontario (average of $246). Flying from North America to Ontario in March is currently the most expensive (average of $328). 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 North America to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
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Top 9 airlines flying from North America to Ontario

Discover the top 9 airlines that operate flights from North America 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 juin 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$23Average$143FlexibilityNo cancel feeOn-time65%
FrontierCheapest$37Average$166FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$385FlexibilityNo cancel feeOn-time69%
DeltaCheapest$58Average$364FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$232FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$97Average$248FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$97Average$334FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$176Average$355FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$236Average$404FlexibilityNo cancel feeOn-time71%

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