USA

$29+ 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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
feb. 19 — feb. 261
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Cheap 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 enero 20, 2026.

This Super.com deal was found by Cheapflights users on 1/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/103:22 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
mar. 2/1712:00 pm
LAS
-
ONT
Nonstop1h 11m
Frontier
Deal found 1/18$59
This Frontier deal was found by Cheapflights users on 1/17. 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. 2/103:22 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
mié. 2/115:12 pm
LAS
-
ONT
Nonstop1h 10m
Frontier
Deal found 1/17$60
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/123:24 pm
ONT
-
LAS
Nonstop1h 12m
Frontier
lun. 2/164:39 pm
LAS
-
ONT
Nonstop1h 09m
Frontier
Deal found 1/20$61
This Booking.com deal was found by Cheapflights users on 1/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/209:43 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
sáb. 2/216:06 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 1/19$62
This Priceline deal was found by Cheapflights users on 1/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/209:43 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
lun. 2/234:39 pm
LAS
-
ONT
Nonstop1h 09m
Frontier
Deal found 1/18$63
This Frontier deal was found by Cheapflights users on 1/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/196:05 am
ONT
-
DEN
Nonstop2h 20m
Frontier
dom. 2/226:20 am
DEN
-
ONT
Nonstop2h 39m
Frontier
Deal found 1/19$63
This CheapOair deal was found by Cheapflights users on 1/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 2/267:22 pm
ONT
-
LAS
Nonstop1h 09m
Frontier
dom. 3/18:21 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 1/19$64
This Priceline deal was found by Cheapflights users on 1/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 2/279:43 pm
ONT
-
LAS
Nonstop1h 10m
Frontier
dom. 3/18:21 pm
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 1/19$66
This Frontier deal was found by Cheapflights users on 1/20. 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.
jue. 2/122:08 pm
ONT
-
DEN
Nonstop2h 23m
Frontier
sáb. 2/1410:29 pm
DEN
-
ONT
Nonstop2h 30m
Frontier
Deal found 1/20$66
This Super.com deal was found by Cheapflights users on 1/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 2/156:10 am
ONT
-
DEN
Nonstop2h 20m
Frontier
dom. 2/226:20 am
DEN
-
ONT
Nonstop2h 39m
Frontier
Deal found 1/19$67
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 2/96:20 am
ONT
-
DEN
Nonstop2h 20m
Frontier
mar. 2/108:00 pm
DEN
-
ONT
Nonstop2h 34m
Frontier
Deal found 1/20$68
This Super.com deal was found by Cheapflights users on 1/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/108:36 am
ONT
-
DEN
Nonstop2h 24m
Frontier
sáb. 3/710:29 pm
DEN
-
ONT
Nonstop2h 30m
Frontier
Deal found 1/18$69

Find flight deals from Ontario to USA

Keep the following information in mind while searching for Ontario to USA flight deals. Data was last updated enero 20, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$59
(Super.com)

One-way from

$29
(Frontier)

Popular in

December

Cheapest in

February

Average price

$287

Good round-trip deal

$84 or less

Good one-way deal

$107 or less
Provider with most accurate pricing for Los Angeles-New York (NYC) flight deals.
Provider most trusted by Cheapflights users for Los Angeles-New York (NYC) flights.
From Ontario to USA
One-way flight from Ontario to USA
Highest demand for flights based on searches. 4% potential increase in price ($16 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Average for round-trip flights in January 2026
Price to beat on a round-trip flight from Ontario to USA.
Price to beat on a one-way flight from Ontario to USA.

Cheapflights Fare Finder

 
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 enero 20, 2026.
Use the filters below to find and compare flights from Ontario to the United States that are best for you.

Fly from

Ontario

Fly to

USA

Route

Depart

Return

Price

OntarioDallas

ONT - DFW

ONTDFW

Ontario

dom. 2/22

2:06 pm-7:11 pm

Nonstop3h 05m

Dallas/Fort Worth

mié. 2/25

11:55 am-9:34 pm

1 stop11h 39m

$138

OntarioDallas

ONT - DFW

ONTDFW

Ontario

lun. 2/9

3:36 pm-8:36 pm

Nonstop3h 00m

Dallas/Fort Worth

jue. 2/12

5:45 am-9:34 am

1 stop5h 49m

$143

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 4/4

5:53 pm-8:50 pm

Nonstop2h 57m

Seattle/Tacoma Intl

mié. 4/15

8:25 am-11:13 am

Nonstop2h 48m

$157

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

mar. 2/24

7:30 am-10:34 am

Nonstop3h 04m

Seattle/Tacoma Intl

mar. 3/3

11:15 am-1:54 pm

Nonstop2h 39m

$157

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 2/14

3:30 pm-6:33 pm

Nonstop3h 03m

Seattle/Tacoma Intl

sáb. 2/21

7:55 pm-10:37 pm

Nonstop2h 42m

$157

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 2/28

4:02 pm-6:52 pm

Nonstop2h 50m

Seattle/Tacoma Intl

lun. 3/2

8:30 am-11:08 am

Nonstop2h 38m

$158

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

vie. 2/27

3:30 pm-6:33 pm

Nonstop3h 03m

Seattle/Tacoma Intl

sáb. 2/28

7:55 pm-10:37 pm

Nonstop2h 42m

$158

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

mié. 4/8

11:59 am-2:55 pm

Nonstop2h 56m

Seattle/Tacoma Intl

lun. 4/13

7:50 pm-10:37 pm

Nonstop2h 47m

$167

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 2/14

3:30 pm-6:33 pm

Nonstop3h 03m

Seattle/Tacoma Intl

jue. 2/19

7:00 pm-11:49 pm

1 stop4h 49m

$168

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 2/28

3:30 pm-6:33 pm

Nonstop3h 03m

Seattle/Tacoma Intl

lun. 3/2

7:00 pm-11:49 pm

1 stop4h 49m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to the United States

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

Currently, February is the cheapest month in which you can book a flight from Ontario to USA (average of $19). Flying from Ontario to USA in July is currently the most expensive (average of $49). 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 enero 20, 2026.

A simple way to save on the total cost of your ticket is to fly from Ontario to USA in the afternoon. If you’re flexible enough to do this you can expect to save up to 28% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Ontario to USA?

Use this chart to determine the cheapest time to fly round-trip from Ontario to USA. Price data was last updated on January 17, 2026.

Travelers seeking maximum savings on their Ontario to USA flight should consider departing on Wednesday at noon when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How often are flights from Ontario to the United States delayed?

About 13% of weekly flights between Ontario and United States have experienced delays in the past year, with the average delay time being 124 minutes.

What is the most punctual flight time for Ontario to the United States flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Ontario to the United States flights?

Over the last year, Delta have had the lowest number of delays on this route, with just 4% of flights being delayed.

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 enero 20, 2026.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to the United States. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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.

  • How long is the flight from Ontario to USA?

    Departing from Ontario to USA will take you 2h 50m. The distance from Ontario to USA is about 956 mi. Generally, flights for this route are nonstop.

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

    $19 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and United Airlines, with prices starting from $24 and $38, respectively.

  • What are the most popular routes 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, February is the cheapest month in which you can book a flight from Ontario to USA (average of $19). Flying from Ontario to USA in July is currently the most expensive (average of $49). 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.

Top 8 airlines flying from Ontario to USA

Discover the top 8 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 enero 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$24Average$150FlexibilityNo cancel feeOn-time65%
FrontierCheapest$30Average$183FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$383FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$269FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$367FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$155Average$329FlexibilityNo cancel feeOn-time62%
DeltaCheapest$178Average$375FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$190Average$423FlexibilityNo cancel feeOn-time71%

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