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Ontario

$47+ 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$63
(Cheapflightsfares)

One-way from

$47
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$372

Good round-trip deal

$87 or less

Good one-way deal

$59 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. 8% potential increase in price ($31 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 July 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 July 31, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/28. 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.
Thu 10/1610:11 pmSFO - ONT
Nonstop1h 29mFrontier
Mon 10/209:41 pmONT - SFO
Nonstop1h 32mFrontier
Deal found 7/28$63
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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 10/2410:29 pmDEN - ONT
Nonstop2h 21mFrontier
Mon 10/276:11 pmONT - DEN
Nonstop2h 22mFrontier
Deal found 7/29$81
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 8/2610:45 amSFO - ONT
Nonstop1h 28mUnited Airlines
Tue 9/26:50 pmONT - SFO
Nonstop1h 19mUnited Airlines
Deal found 7/29$97
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1812:05 pmSEA - ONT
Nonstop2h 48mFrontier
Mon 9/228:43 amONT - SEA
Nonstop2h 58mFrontier
Deal found 7/30$131
This CheapOair deal was found by Cheapflights users on 7/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:14 pmIAH - ONT
Nonstop3h 26mFrontier
Sun 10/2612:40 pmONT - IAH
Nonstop3h 16mFrontier
Deal found 7/30$151
This Delta deal was found by Cheapflights users on 7/29. 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.
Tue 10/218:05 pmSEA - ONT
Nonstop2h 44mDelta
Tue 11/411:48 amONT - SEA
Nonstop2h 57mDelta
Deal found 7/29$157
This Hawaiian Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 8/237:55 amSEA - ONT
Nonstop2h 49mHawaiian Airlines
Tue 8/265:49 pmONT - SEA
1 stop4h 40mHawaiian Airlines
Deal found 7/29$167
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 10/215:21 amSEA - ONT
1 stop4h 40mAlaska Airlines
Tue 11/46:00 amONT - SEA
Nonstop2h 50mAlaska Airlines
Deal found 7/29$187
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Fri 9/267:59 pmIAH - ONT
Nonstop3h 25mUnited Airlines
Mon 9/296:00 amONT - IAH
Nonstop3h 10mUnited Airlines
Deal found 7/30$191
This Southwest deal was found by Cheapflights users on 7/31. 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.
Fri 9/267:50 amHOU - ONT
Nonstop3h 15mSouthwest
Mon 9/296:20 amONT - HOU
Nonstop3h 10mSouthwest
Deal found 7/31$191
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:00 amIAH - ONT
1 stop10h 12mAlaska Airlines
Tue 9/167:10 amONT - IAH
1 stop7h 49mAlaska Airlines
Deal found 7/30$210
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Tue 9/27:47 amIAH - ONT
1 stop6h 05mAmerican Airlines
Tue 9/96:10 amONT - IAH
1 stop5h 30mAmerican Airlines
Deal found 7/29$211

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 July 31, 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

Thu 10/16

10:11 pm-11:40 pm

Nonstop1h 29m

Ontario

Mon 10/20

9:41 pm-11:13 pm

Nonstop1h 32m

$63

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 10/24

10:29 pm-11:50 pm

Nonstop2h 21m

Ontario

Mon 10/27

6:11 pm-9:33 pm

Nonstop2h 22m

$81

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 8/26

10:45 am-12:13 pm

Nonstop1h 28m

Ontario

Tue 9/2

6:50 pm-8:09 pm

Nonstop1h 19m

$97

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 9/18

12:05 pm-2:53 pm

Nonstop2h 48m

Ontario

Mon 9/22

8:43 am-11:41 am

Nonstop2h 58m

$131

HoustonOntario

IAH - ONT

IAHONT

Houston George Bush Intcntl

Thu 10/30

5:14 pm-6:40 pm

Nonstop3h 26m

Ontario

Fri 10/31

12:40 pm-5:56 pm

Nonstop3h 16m

$146

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/21

8:05 pm-10:49 pm

Nonstop2h 44m

Ontario

Tue 11/4

11:48 am-2:45 pm

Nonstop2h 57m

$157

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 8/23

7:55 am-10:44 am

Nonstop2h 49m

Ontario

Tue 8/26

5:49 pm-10:29 pm

1 stop4h 40m

$167

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/21

5:21 am-10:01 am

1 stop4h 40m

Ontario

Tue 11/4

6:00 am-8:50 am

Nonstop2h 50m

$187

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Fri 9/26

7:50 am-9:05 am

Nonstop3h 15m

Ontario

Mon 9/29

6:20 am-11:30 am

Nonstop3h 10m

$191

HoustonOntario

IAH - ONT

IAHONT

Houston George Bush Intcntl

Fri 9/26

7:59 pm-9:24 pm

Nonstop3h 25m

Ontario

Mon 9/29

6:00 am-11:10 am

Nonstop3h 10m

$191

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 July 31, 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.

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 July 31, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from North America to Ontario have to say. 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

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 Frontier ($47), United Airlines ($49), and Southwest ($79).

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

    The most popular flight routes from North America to Ontario are San Francisco - Ontario, Newark - Ontario and New York John F Kennedy Intl - 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.
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Top 8 airlines flying from North America to Ontario

Discover the top 8 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$23Average$153FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$188FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$376FlexibilityNo cancel feeOn-time69%
DeltaCheapest$58Average$405FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$185FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$352FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$176Average$328FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$186Average$376FlexibilityNo cancel feeOn-time71%

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