HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$36+ 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 4/27. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Feb 27 — Mar 61
Thu 2/27
Thu 3/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from North America to Ontario with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 February 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$41
(Kiwi.com)

One-way from

$36
(Cheapflightsfares)

Popular in

December

Cheapest in

January

Average price

$366

Good round-trip deal

$42 or less

Good one-way deal

$28 or less
Provider with most accurate pricing for New York (NYC)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Los Angeles flights.
Search Deals
From North America to Ontario
Search Deals
One-way flight from North America to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($10 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
Search Deals
Price to beat on a round-trip flight from North America to Ontario.
Search Deals
Price to beat on a one-way flight from North America to Ontario.
Search Deals

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 February 22, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 2/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/38:34 amSFO - ONT
Nonstop1h 28mFrontier
Mon 5/58:24 amONT - SFO
Nonstop1h 38mFrontier
Deal found 2/21$46
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Sat 3/89:15 pmSFO - ONT
Nonstop1h 30mUnited Airlines
Tue 3/116:00 amONT - SFO
Nonstop1h 29mUnited Airlines
Deal found 2/22$57
This Cheapflightsfares deal was found by Cheapflights users on 2/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/107:55 amDEN - ONT
Nonstop2h 36mFrontier
Wed 3/1212:59 amONT - DEN
Nonstop2h 17mFrontier
Deal found 2/21$68
This Cheapflightsfares deal was found by Cheapflights users on 2/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1212:07 pmIAH - ONT
Nonstop3h 36mFrontier
Tue 3/184:04 pmONT - IAH
Nonstop3h 17mFrontier
Deal found 2/21$82
This Trip.com deal was found by Cheapflights users on 2/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1312:52 pmSEA - ONT
Nonstop2h 37mMultiple Airlines
Mon 3/176:00 amONT - SEA
Nonstop2h 50mMultiple Airlines
Deal found 2/21$93
This Cheapflightsfares deal was found by Cheapflights users on 2/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1412:52 pmSEA - ONT
Nonstop2h 37mFrontier
Mon 3/1710:21 amONT - SEA
Nonstop2h 51mFrontier
Deal found 2/21$96
This Delta deal was found by Cheapflights users on 2/22. 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.
Fri 3/141:59 pmSEA - ONT
Nonstop2h 43mDelta
Sun 3/165:40 amONT - SEA
Nonstop2h 57mDelta
Deal found 2/22$97
This Southwest deal was found by Cheapflights users on 2/21. 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.
Mon 5/129:40 pmDEN - ONT
Nonstop2h 20mSouthwest
Wed 5/145:45 amONT - DEN
Nonstop2h 10mSouthwest
Deal found 2/21$97
This United Airlines deal was found by Cheapflights users on 2/21. 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.
Thu 4/247:19 pmDEN - ONT
Nonstop2h 23mUnited Airlines
Sun 4/275:00 amONT - DEN
Nonstop2h 19mUnited Airlines
Deal found 2/21$124
This Alaska Airlines deal was found by Cheapflights users on 2/21. 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.
Sun 3/239:23 pmSEA - ONT
Nonstop2h 36mAlaska Airlines
Wed 3/266:00 amONT - SEA
Nonstop2h 50mAlaska Airlines
Deal found 2/21$132
This Mytrip deal was found by Cheapflights users on 2/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/56:45 amORD - ONT
1 stop13h 12mFrontier
Mon 4/712:59 amONT - ORD
1 stop21h 11mFrontier
Deal found 2/21$134
This Cheapflightsfares deal was found by Cheapflights users on 2/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/172:54 pmPDX - ONT
Nonstop2h 21mFrontier
Fri 6/2011:28 amONT - PDX
Nonstop2h 26mFrontier
Deal found 2/21$146

Find flights from North America to Ontario within your budget

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 February 22, 2025.

Fly from

North America

Fly to

Ontario

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 5/3

8:34 am-10:02 am

Nonstop1h 28m

Ontario

Mon 5/5

8:24 am-10:02 am

Nonstop1h 38m

$46

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 3/8

9:15 pm-10:45 pm

Nonstop1h 30m

Ontario

Tue 3/11

6:00 am-7:29 am

Nonstop1h 29m

$57

DenverOntario

DEN - ONT

DENONT

Denver Intl

Mon 3/10

10:37 pm-12:09 am

Nonstop2h 32m

Ontario

Wed 3/12

12:59 am-4:16 am

Nonstop2h 17m

$68

HoustonOntario

IAH - ONT

IAHONT

Houston George Bush Intcntl

Wed 3/12

12:07 pm-1:43 pm

Nonstop3h 36m

Ontario

Tue 3/18

4:04 pm-9:21 pm

Nonstop3h 17m

$82

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 3/13

12:52 pm-3:29 pm

Nonstop2h 37m

Ontario

Mon 3/17

6:00 am-8:50 am

Nonstop2h 50m

$93

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 3/14

12:52 pm-3:29 pm

Nonstop2h 37m

Ontario

Mon 3/17

10:21 am-1:12 pm

Nonstop2h 51m

$96

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 3/14

1:59 pm-4:42 pm

Nonstop2h 43m

Ontario

Sat 3/15

5:40 am-8:37 am

Nonstop2h 57m

$97

DenverOntario

DEN - ONT

DENONT

Denver Intl

Mon 5/12

9:40 pm-11:00 pm

Nonstop2h 20m

Ontario

Wed 5/14

5:45 am-8:55 am

Nonstop2h 10m

$97

DenverOntario

DEN - ONT

DENONT

Denver Intl

Thu 4/24

7:19 pm-8:42 pm

Nonstop2h 23m

Ontario

Sun 4/27

5:00 am-8:19 am

Nonstop2h 19m

$124

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sun 3/23

9:23 pm-11:59 pm

Nonstop2h 36m

Ontario

Wed 3/26

6:00 am-8:50 am

Nonstop2h 50m

$132

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/22

Showing 1-10 of 60 results
1
2
3
...
6

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.

Travel insights for flights from North America to Ontario

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

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 $315). 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 February 22, 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 February 22, 2025.
Southwest
8.1
Very good
4,395 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Southwest
8.1
Very good
4,395 reviews
Southwest
8.1
Very good
4,395 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Alaska Airlines
8.0
Very good
9,700 reviews
Southwest
8.1
Very good
4,395 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Delta
8.0
Very good
8,212 reviews
Southwest
8.1
Very good
4,395 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

Hawaiian Airlines
7.9
Good
2,314 reviews
Southwest
8.1
Very good
4,395 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

JetBlue
7.4
Good
3,068 reviews
Southwest
8.1
Very good
4,395 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

10.0
Excellent

Sarah,Aug 2024

MDW - AUS

My first time, surprisingly good! It was a good ride overall. Coming from Singapore, this budget flight is better than the budget airline for our national carrier Singapore Airlines.

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 ($36), Delta ($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, San Francisco - 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 $315). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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
John F Kennedy Intl to Las Vegas flights
Newark to Los Angeles flights
O'Hare Intl to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
Newark to Las Vegas flights
Seattle to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Seattle to Los Angeles flights
Minneapolis to Las Vegas flights
O'Hare Intl to Los Angeles flights
Dulles Intl to Las Vegas flights
LaGuardia to Las Vegas flights
San Francisco to Las Vegas flights
Seattle to San Diego flights
Newark to San Francisco flights
Boston to Las Vegas flights
Dulles Intl to Los Angeles flights
Denver to Las Vegas flights
Seattle to San Francisco flights
Baltimore to Las Vegas flights
Los Angeles to Las Vegas flights
Atlanta to Las Vegas flights
LaGuardia to Los Angeles flights
San Francisco to Los Angeles flights
Dallas/Fort Worth to Los Angeles flights
Midway to Las Vegas flights
Reagan-National to Los Angeles flights
Seattle to Santa Ana flights
Baltimore to Los Angeles flights
Detroit to Las Vegas flights
Oakland to Las Vegas flights
Reagan-National to Las Vegas flights
O'Hare Intl to San Francisco flights
Boston to Los Angeles flights
Oakland to Los Angeles flights
Los Angeles to San Francisco flights
San Jose to Las Vegas flights
Santa Ana to Las Vegas flights
Burbank to Las Vegas flights
San Jose to Los Angeles flights
Dulles Intl to San Francisco flights
John F Kennedy Intl to San Diego flights
Portland to Los Angeles flights
Hobby to Las Vegas flights
Newark to San Diego flights
Philadelphia to Las Vegas flights
Fort Lauderdale to Las Vegas flights
Newark to Burbank flights
Los Angeles to Oakland flights

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 February 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$26Average$191FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$183FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$45Average$227FlexibilityNo cancel feeOn-time75%
DeltaCheapest$45Average$359FlexibilityNo cancel feeOn-timeN/A
Breeze AirwaysCheapest$78Average$116FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$112Average$410FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$152Average$360FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$176Average$386FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$216Average$409FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.