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$39+ Cheap flights from Ontario (ONT) to the United States

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Dec 27 — Jan 31
Fri 12/27
Fri 1/3
1 adult, Economy
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Cheap flight deals from Ontario to USA

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to USA (US0). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 22, 2024.

Round-trip from

$50
(Gotogate)

One-way from

$39
(Kiwi.com)
From Ontario to USA
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One-way flight from Ontario to USA
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Find flight deals from Ontario to USA

Cheapest flights from Ontario to USA
Explore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 22, 2024.

This Cheapflightsfares deal was found by Cheapflights users on 12/22. 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.
Wed 12/2510:39 pmONT - LAS
Nonstop1h 20mFrontier
Sun 12/297:00 amLAS - ONT
Nonstop1h 06mFrontier
Deal found 12/22$85
This FlightHub deal was found by Cheapflights users on 12/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2312:00 pmONT - SFO
Nonstop1h 29mFrontier
Mon 12/302:29 pmSFO - ONT
Nonstop1h 22mFrontier
Deal found 12/21$94
This Frontier deal was found by Cheapflights users on 12/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/314:48 pmONT - DFW
Nonstop2h 55mFrontier
Wed 1/89:35 pmDFW - ONT
1 stop11h 34mFrontier
Deal found 12/21$169
This Priceline deal was found by Cheapflights users on 12/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3110:39 pmONT - IAH
1 stop10h 31mFrontier
Thu 1/165:35 amIAH - ONT
1 stop6h 52mFrontier
Deal found 12/21$172
This Delta deal was found by Cheapflights users on 12/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/304:58 pmONT - SEA
1 stop7h 28mDelta
Mon 1/137:45 pmSEA - ONT
Nonstop2h 47mDelta
Deal found 12/22$242
This FlightHub deal was found by Cheapflights users on 12/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/247:59 amONT - SEA
Nonstop3h 00mFrontier
Sun 12/298:26 pmSEA - ONT
1 stop10h 43mFrontier
Deal found 12/22$243
This Alaska Airlines deal was found by Cheapflights users on 12/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:00 amONT - SEA
Nonstop2h 56mAlaska Airlines
Mon 1/133:40 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 12/22$282
This Mytrip deal was found by Cheapflights users on 12/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2510:39 pmONT - JFK
1 stop28h 51mFrontier
Sat 1/117:59 amJFK - ONT
1 stop14h 07mFrontier
Deal found 12/20$285
This Orbitz deal was found by Cheapflights users on 12/22. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/276:00 amONT - SEA
Nonstop2h 56mMultiple Airlines
Sun 1/56:52 pmSEA - ONT
Nonstop2h 39mMultiple Airlines
Deal found 12/22$303
This United Airlines deal was found by Cheapflights users on 12/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/311:57 pmONT - SFO
Nonstop1h 38mUnited Airlines
Tue 1/74:35 pmSFO - ONT
Nonstop1h 29mUnited Airlines
Deal found 12/21$313
This United Airlines deal was found by Cheapflights users on 12/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2410:39 amONT - SEA
1 stop4h 46mUnited Airlines
Tue 12/314:30 pmSEA - ONT
1 stop6h 30mUnited Airlines
Deal found 12/21$351
This American Airlines deal was found by Cheapflights users on 12/21. 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.
Tue 12/3110:02 amONT - SFO
1 stop8h 57mAmerican Airlines
Mon 1/64:28 pmSFO - ONT
1 stop16h 41mAmerican Airlines
Deal found 12/21$365

Find flights from Ontario to USA within your budget

Customize your flight search to find flights from Ontario to USA 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 December 22, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 1/2

7:05 pm-8:11 pm

Nonstop1h 06m

Las Vegas Harry Reid Intl

Sun 1/5

11:20 am-12:29 pm

Nonstop1h 09m

$50

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 1/7

10:47 am-12:20 pm

Nonstop1h 33m

San Francisco

Tue 1/7

4:35 pm-6:04 pm

Nonstop1h 29m

$57

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 1/17

6:00 am-7:35 am

Nonstop1h 35m

San Francisco

Mon 1/20

9:59 pm-11:24 pm

Nonstop1h 25m

$58

OntarioHouston

ONT - IAH

ONTIAH

Ontario

Wed 3/26

4:04 pm-9:21 pm

Nonstop3h 17m

Houston George Bush Intcntl

Wed 4/2

12:07 pm-1:40 pm

Nonstop3h 33m

$98

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Wed 1/15

7:45 am-5:28 pm

1 stop7h 43m

Houston Hobby

Wed 1/22

6:16 pm-11:47 pm

1 stop7h 31m

$108

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 1/16

6:45 am-3:35 pm

1 stop8h 50m

Seattle/Tacoma Intl

Sun 1/19

4:35 pm-7:12 pm

Nonstop2h 37m

$108

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 1/23

11:27 am-2:18 pm

Nonstop2h 51m

Seattle/Tacoma Intl

Wed 1/29

5:40 pm-8:13 pm

Nonstop2h 33m

$123

OntarioMiami

ONT - MIA

ONTMIA

Ontario

Sat 2/22

8:09 pm-10:53 am

1 stop11h 44m

Miami

Thu 2/27

1:29 pm-6:58 pm

1 stop8h 29m

$128

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 1/18

6:00 am-8:54 am

Nonstop2h 54m

Seattle/Tacoma Intl

Tue 1/21

8:00 am-10:49 am

Nonstop2h 49m

$137

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Fri 2/7

9:36 pm-4:42 am

1 stop5h 06m

Dallas/Fort Worth

Sun 2/9

6:35 am-8:02 am

Nonstop3h 27m

$145

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

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

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

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

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

Currently, January is the cheapest month in which you can book a flight from Ontario to USA (average of $246). Flying from Ontario to USA in March is currently the most expensive (average of $344). 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 ONT to US?

Find hourly flight availability from Ontario to USA. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 22, 2024.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to USA as you normally would.

Rainfall in USA by month

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

In terms of precipitation, rainfall in USA ranges from 2.8 - 4.5 inches per month. July is typically the wettest month, when rainfall can reach 4.5 in. February is typically the driest time to visit USA when rainfall is around 2.8 in.

Temperature in USA by month

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

If weather is an important factor for your trip to USA, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing USA

Get insights into the airlines that provide service to USA. 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 USA. Reviews last updated December 22, 2024.
Peruse reviews from past customers who have flown with Delta, Frontier and American Airlines from Ontario to USA to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,804 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
4,804 reviews
Southwest
8.1
Very good
4,804 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,549 reviews
Southwest
8.1
Very good
4,804 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,594 reviews
Southwest
8.1
Very good
4,804 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Hawaiian Airlines
7.9
Good
2,297 reviews
Southwest
8.1
Very good
4,804 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Avelo Airlines
7.5
Good
74 reviews
Southwest
8.1
Very good
4,804 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Related info for your journey

Find useful and relevant information for your journey from Ontario to USA. 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 from for flights from Ontario to United States?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to United States. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

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

    $39 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $59 and $69, respectively.

  • What are the most popular routes from Ontario to USA?

    While some choose either Ontario - Dallas/Fort Worth or Ontario - Las Vegas Harry Reid Intl, Ontario - Seattle/Tacoma Intl is the most popular route from Ontario to USA.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to USA 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 Ontario to USA?

    Currently, January is the cheapest month in which you can book a flight from Ontario to USA (average of $246). Flying from Ontario to USA in March is currently the most expensive (average of $344). 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 Ontario to USA

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Ontario to USA

Discover the top 9 airlines that operate flights from Ontario to USA. 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 December 22, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$31Average$183FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$196FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$38Average$255FlexibilityNo cancel feeOn-time75%
Breeze AirwaysCheapest$78Average$139FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$78Average$336FlexibilityNo cancel feeOn-time62%
DeltaCheapest$85Average$379FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$132Average$435FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$176Average$415FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$413FlexibilityNo cancel feeOn-time71%
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