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$40+ 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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
May 28 — Jun 41
Wed 5/28
Wed 6/4
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 May 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$57
(United Airlines)

One-way from

$40
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$356

Good round-trip deal

$59 or less

Good one-way deal

$39 or less
Provider with most accurate pricing for New York (NYC)-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Los Angeles flights.
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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. 5% potential increase in price ($21 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 May 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 May 23, 2025.

This United Airlines deal was found by Cheapflights users on 5/22. 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.
Wed 6/119:18 pmSFO - ONT
Nonstop1h 27mUnited Airlines
Fri 6/136:00 amONT - SFO
Nonstop1h 27mUnited Airlines
Deal found 5/22$57
This Kiwi.com deal was found by Cheapflights users on 5/22. 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.
Fri 6/2010:11 pmSFO - ONT
Nonstop1h 28mFrontier
Fri 6/279:41 pmONT - SFO
Nonstop1h 34mFrontier
Deal found 5/22$58
This Cheapflightsfares deal was found by Cheapflights users on 5/20. 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.
Fri 6/131:50 pmSEA - ONT
Nonstop2h 40mFrontier
Sun 6/1510:03 amONT - SEA
Nonstop2h 46mFrontier
Deal found 5/20$123
This Southwest deal was found by Cheapflights users on 5/21. 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.
Thu 6/128:05 amSJC - ONT
Nonstop1h 20mSouthwest
Tue 6/175:25 pmONT - SJC
1 stop5h 30mSouthwest
Deal found 5/21$124
This Cheapflightsfares deal was found by Cheapflights users on 5/22. 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.
Sat 6/146:05 pmDFW - ONT
Nonstop3h 09mFrontier
Sat 6/218:09 pmONT - DFW
Nonstop3h 16mFrontier
Deal found 5/22$136
This Frontier deal was found by Cheapflights users on 5/22. 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 6/132:18 pmSJC - ONT
1 stop6h 33mFrontier
Mon 6/166:00 amONT - SJC
1 stop7h 23mFrontier
Deal found 5/22$166
This Cheapflightsfares deal was found by Cheapflights users on 5/23. 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 7/185:09 pmIAH - ONT
Nonstop3h 18mFrontier
Fri 8/112:48 pmONT - IAH
Nonstop3h 31mFrontier
Deal found 5/23$176
This Delta deal was found by Cheapflights users on 5/21. 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.
Wed 6/117:30 amSEA - ONT
Nonstop2h 55mDelta
Wed 6/113:09 pmONT - SEA
Nonstop2h 54mDelta
Deal found 5/21$177
This Alaska Airlines deal was found by Cheapflights users on 5/21. 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 9/165:20 amSEA - ONT
1 stop4h 06mAlaska Airlines
Sat 9/203:04 pmONT - SEA
Nonstop2h 40mAlaska Airlines
Deal found 5/21$187
This Orbitz deal was found by Cheapflights users on 5/21. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/91:50 pmSEA - ONT
Nonstop2h 40mMultiple Airlines
Sat 6/146:51 pmONT - SEA
Nonstop2h 40mMultiple Airlines
Deal found 5/21$208
This American Airlines deal was found by Cheapflights users on 5/21. 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.
Sun 5/256:00 amSFO - ONT
1 stop5h 50mAmerican Airlines
Sun 5/251:14 pmONT - SFO
1 stop5h 44mAmerican Airlines
Deal found 5/21$216
This Cheapflightsfares deal was found by Cheapflights users on 5/22. 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 9/125:25 amORD - ONT
1 stop7h 32mFrontier
Sun 9/1412:59 amONT - ORD
1 stop6h 37mFrontier
Deal found 5/22$221

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 May 23, 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

Wed 6/11

9:18 pm-10:45 pm

Nonstop1h 27m

Ontario

Fri 6/13

6:00 am-7:27 am

Nonstop1h 27m

$57

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 6/20

10:11 pm-11:39 pm

Nonstop1h 28m

Ontario

Fri 6/27

9:41 pm-11:15 pm

Nonstop1h 34m

$58

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 6/13

1:50 pm-4:30 pm

Nonstop2h 40m

Ontario

Sun 6/15

10:03 am-12:49 pm

Nonstop2h 46m

$123

San JoseOntario

SJC - ONT

SJCONT

San Jose

Thu 6/12

8:05 am-9:25 am

Nonstop1h 20m

Ontario

Tue 6/17

5:25 pm-10:55 pm

1 stop5h 30m

$124

DallasOntario

DFW - ONT

DFWONT

Dallas/Fort Worth

Sat 6/14

6:05 pm-7:14 pm

Nonstop3h 09m

Ontario

Sat 6/21

8:09 pm-1:25 am

Nonstop3h 16m

$136

San JoseOntario

SJC - ONT

SJCONT

San Jose

Fri 6/13

2:18 pm-8:51 pm

1 stop6h 33m

Ontario

Mon 6/16

6:00 am-1:23 pm

1 stop7h 23m

$166

HoustonOntario

IAH - ONT

IAHONT

Houston George Bush Intcntl

Fri 7/18

5:09 pm-6:27 pm

Nonstop3h 18m

Ontario

Fri 8/1

12:48 pm-6:19 pm

Nonstop3h 31m

$176

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 6/11

7:30 am-10:25 am

Nonstop2h 55m

Ontario

Wed 6/11

3:09 pm-6:03 pm

Nonstop2h 54m

$177

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 9/16

5:20 am-9:26 am

1 stop4h 06m

Ontario

Sat 9/20

3:04 pm-5:44 pm

Nonstop2h 40m

$187

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 6/9

1:50 pm-4:30 pm

Nonstop2h 40m

Ontario

Sat 6/14

6:51 pm-9:31 pm

Nonstop2h 40m

$208

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/22

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 May 23, 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 May 23, 2025.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

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

Comfort

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

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
4,291 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

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

Comfort

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

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
2,450 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

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
8,745 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

Food

7.1

Entertainment

7.1

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 Frontier ($40), Southwest ($49), and United Airlines ($59).

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

    The most popular flight routes from North America to Ontario are Seattle/Tacoma Intl - Ontario, New York John F Kennedy Intl - Ontario and Dallas/Fort Worth - 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 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 May 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$23Average$163FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$165FlexibilityNo cancel feeOn-time62%
DeltaCheapest$58Average$366FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$236FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$61Average$385FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$97Average$243FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$97Average$335FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$176Average$353FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$230Average$412FlexibilityNo cancel feeOn-time71%

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