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

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 5/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — LAX
may. 29 — jun. 51

How far in advance should I book a flight from Ontario to USA?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 31 days in advance, which can save you up to 73% on flights from Ontario to USA compared to booking the week you need them. Waiting 31 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $398. For sooner than that we have options available in the next 3 days from $543.

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

September can be a great time to fly to USA from Ontario with a flight ticket averaging about $350. Cheapflights users have found deals in the month of September for as cheap as $119. The most expensive prices can be found in the month of December.

When is the cheapest time to fly from Ontario to USA (ONT - US)?

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.

Cheap Frontier flights from Ontario to USA

Explore cheap flight options specifically provided by Frontier for the route between Ontario and USA. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,725,499 searches. Data last updated mayo 24, 2024.
Take a peek at the cheapest Frontier flights we've detected traveling from Ontario to USA. Come back soon if you're not finding the exact deal you're looking for.
mar. 6/47:39 amONT - SFO
Nonstop1h 28mFrontier
mié. 6/55:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$57
mar. 8/207:36 amONT - SFO
Nonstop1h 26mFrontier
mié. 8/285:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$58
mar. 8/68:07 amONT - SFO
Nonstop1h 26mFrontier
mar. 8/205:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$59
mar. 6/257:59 amONT - SFO
Nonstop1h 27mFrontier
mié. 6/265:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$61
mar. 7/308:07 amONT - SFO
Nonstop1h 26mFrontier
mar. 8/65:45 amSFO - ONT
Nonstop1h 22mFrontier
Deal found 5/22$62
mié. 8/217:36 amONT - SFO
Nonstop1h 26mFrontier
sáb. 8/245:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$63
mié. 7/246:08 pmONT - SFO
Nonstop1h 24mFrontier
sáb. 7/276:00 amSFO - ONT
Nonstop1h 25mFrontier
Deal found 5/22$64
mar. 6/187:59 amONT - SFO
Nonstop1h 27mFrontier
sáb. 6/295:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/23$66
sáb. 6/87:59 amONT - SFO
Nonstop1h 27mFrontier
dom. 6/95:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$67

Cheap American Airlines flights from Ontario to USA

Explore cheap flight options specifically provided by American Airlines for the route between Ontario and USA. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,725,499 searches. Data last updated mayo 24, 2024.
Some of the best deals we've found on American Airlines flights traveling from Ontario to USA. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
sáb. 6/156:30 amONT - SFO
1 stop5h 48mAmerican Airlines
sáb. 6/153:45 pmSFO - ONT
1 stop5h 55mAmerican Airlines
Deal found 5/22$143
sáb. 6/294:36 pmONT - SFO
1 stop6h 02mAmerican Airlines
jue. 7/412:10 pmSFO - ONT
1 stop6h 48mAmerican Airlines
Deal found 5/22$148
sáb. 9/1411:00 pmONT - LGA
1 stop8h 48mAmerican Airlines
sáb. 9/215:35 pmLGA - ONT
1 stop7h 25mAmerican Airlines
Deal found 5/22$223
mar. 9/1011:59 pmONT - LGA
1 stop8h 46mAmerican Airlines
mar. 9/173:17 pmLGA - ONT
1 stop9h 43mAmerican Airlines
Deal found 5/22$225
jue. 8/229:20 amONT - SFO
1 stop6h 41mAmerican Airlines
sáb. 8/249:20 amSFO - ONT
1 stop9h 04mAmerican Airlines
Deal found 5/22$232
mar. 5/2810:29 pmONT - JFK
1 stop8h 30mAmerican Airlines
sáb. 6/16:35 amJFK - ONT
1 stop8h 12mAmerican Airlines
Deal found 5/23$321
mié. 5/296:45 amONT - JFK
2 stops10h 38mAmerican Airlines
dom. 6/26:35 amJFK - ONT
1 stop8h 12mAmerican Airlines
Deal found 5/23$327
sáb. 6/112:53 pmONT - IAH
2 stops7h 33mAmerican Airlines
sáb. 6/86:00 amIAH - ONT
1 stop6h 03mAmerican Airlines
Deal found 5/23$351

Cheap Ontario to USA flights in May & June 2024

Find cheap flight options from Ontario to USA specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,725,499 searches. Prices were last updated on mayo 24, 2024.
The lowest fares we've come across on flights traveling from Ontario to USA in May and June 2024. More deals are always being added, so be sure to check back regularly.
mar. 6/47:39 amONT - SFO
Nonstop1h 28mFrontier
mié. 6/55:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$57
sáb. 6/227:59 amONT - SFO
Nonstop1h 27mFrontier
mar. 6/255:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$58
mié. 5/297:39 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/15:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$61
jue. 5/307:39 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/15:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/23$64
vie. 5/317:39 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/15:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$66
sáb. 6/87:59 amONT - SFO
Nonstop1h 27mFrontier
dom. 6/95:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$67
mié. 6/198:09 amONT - SFO
Nonstop1h 28mFrontier
dom. 6/235:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$68
vie. 6/78:18 amONT - SFO
Nonstop1h 28mFrontier
mié. 6/125:15 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/21$69
vie. 6/218:16 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/225:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$70

Ontario to USA 2024 flight deals

Discover exclusive flight deals for travel between Ontario and USA in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,725,499 searches. Data last updated mayo 24, 2024.
The lowest fares we've come across on flights traveling from Ontario to USA in May and June 2024. More deals are always being added, so be sure to check back regularly.
mié. 5/297:39 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/15:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/23$48
mié. 6/58:14 amONT - SFO
Nonstop1h 28mFrontier
mar. 6/115:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/23$54
mié. 6/58:14 amONT - SFO
Nonstop1h 28mFrontier
mar. 6/115:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/23$57
mar. 8/207:36 amONT - SFO
Nonstop1h 26mFrontier
mié. 8/285:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$58
mar. 8/68:07 amONT - SFO
Nonstop1h 26mFrontier
mar. 8/205:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$59
mar. 6/47:39 amONT - SFO
Nonstop1h 28mFrontier
mar. 6/115:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/23$60
mié. 5/297:39 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/15:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$61
mar. 7/308:07 amONT - SFO
Nonstop1h 26mFrontier
mar. 8/65:45 amSFO - ONT
Nonstop1h 22mFrontier
Deal found 5/22$62
mié. 8/217:36 amONT - SFO
Nonstop1h 26mFrontier
sáb. 8/245:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$63

Non-stop flights to USA from Ontario

Discover non-stop flight options from Ontario to USA. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,725,499 searches. Data last updated mayo 24, 2024.
Take a look at some of the direct flights traveling from Ontario to USA in the near future. Search for alternative flights from Ontario to USA by utilizing the search form above.
lun. 8/197:36 amONT - SFO
Nonstop1h 26mFrontier
mar. 8/275:15 amSFO - ONT
Nonstop1h 21mFrontier
Deal found 5/23$68
sáb. 7/138:07 amONT - SFO
Nonstop1h 26mFrontier
lun. 7/155:50 amSFO - ONT
Nonstop1h 22mFrontier
Deal found 5/22$69
lun. 7/298:02 amONT - SFO
Nonstop1h 26mFrontier
mar. 7/305:45 amSFO - ONT
Nonstop1h 22mFrontier
Deal found 5/22$70
sáb. 6/227:59 amONT - SFO
Nonstop1h 27mFrontier
mié. 7/35:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/23$71
mié. 6/58:14 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/85:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$72
mar. 6/47:39 amONT - SFO
Nonstop1h 28mFrontier
sáb. 6/85:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$73
sáb. 7/68:07 amONT - SFO
Nonstop1h 26mFrontier
lun. 7/85:50 amSFO - ONT
Nonstop1h 22mFrontier
Deal found 5/23$74
vie. 6/148:16 amONT - SFO
Nonstop1h 28mFrontier
mar. 6/185:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$75
lun. 7/17:59 amONT - SFO
Nonstop1h 27mFrontier
mié. 7/35:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/21$76

Ontario to USA flights leaving soon

Find last-minute flight options from Ontario to USA for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,725,499 searches. Data last updated mayo 24, 2024.
Have a look at some of the flights available from Ontario to USA departing last-minute. Tip: verify your flight details before completing your reservation.
dom. 6/27:39 amONT - SFO
Nonstop1h 28mFrontier
mar. 6/45:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/21$67
dom. 6/27:39 amONT - SFO
Nonstop1h 28mFrontier
mié. 6/55:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/22$68
sáb. 6/17:39 amONT - SFO
Nonstop1h 28mFrontier
mar. 6/45:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$71
sáb. 6/17:39 amONT - SFO
Nonstop1h 28mFrontier
lun. 6/35:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/23$73
jue. 5/307:39 amONT - SFO
Nonstop1h 28mFrontier
jue. 6/65:45 amSFO - ONT
Nonstop1h 23mFrontier
Deal found 5/23$74
jue. 5/307:39 amONT - SFO
Nonstop1h 28mFrontier
lun. 6/35:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/23$77
mié. 5/297:39 amONT - SFO
Nonstop1h 28mFrontier
dom. 6/25:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$78
jue. 5/307:39 amONT - SFO
Nonstop1h 28mFrontier
lun. 6/35:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$79
jue. 5/307:39 amONT - SFO
Nonstop1h 28mFrontier
dom. 6/25:15 amSFO - ONT
Nonstop1h 24mFrontier
Deal found 5/22$80

One-way flights to USA from Ontario

Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,725,499 searches. Data last updated mayo 24, 2024.
Take a look at some of the one-way flights we've detected from Ontario to USA. Users can also find round-trip Ontario to USA flights by using the search form above.
jue. 5/307:39 amONT - SFO
Nonstop1h 28mFrontier
Deal found 5/22$39
dom. 6/27:39 amONT - SFO
Nonstop1h 28mFrontier
Deal found 5/22$40
dom. 8/48:07 amONT - SFO
Nonstop1h 26mFrontier
Deal found 5/22$41
sáb. 6/17:39 amONT - SFO
Nonstop1h 28mFrontier
Deal found 5/22$43
dom. 7/78:07 amONT - SFO
Nonstop1h 26mFrontier
Deal found 5/22$44
vie. 6/148:16 amONT - SFO
Nonstop1h 28mFrontier
Deal found 5/22$46
dom. 7/78:07 amONT - SFO
Nonstop1h 26mFrontier
Deal found 5/23$48
mié. 8/76:50 pmONT - DFW
Nonstop3h 05mFrontier
Deal found 5/23$49
mar. 6/259:54 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/23$49

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 2,725,499 searches. Data last updated mayo 24, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$57 - $177

Route

Depart

Return

Price

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mar. 6/4

Nonstop1h 28m

San Francisco

mié. 6/5

Nonstop1h 23m

$57

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mar. 8/20

Nonstop1h 26m

San Francisco

mié. 8/28

Nonstop1h 21m

$58

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mar. 8/6

Nonstop1h 26m

San Francisco

mar. 8/20

Nonstop1h 21m

$59

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mar. 6/25

Nonstop1h 27m

San Francisco

mié. 6/26

Nonstop1h 23m

$61

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mar. 7/30

Nonstop1h 26m

San Francisco

mar. 8/6

Nonstop1h 22m

$62

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

mié. 8/21

Nonstop1h 26m

San Francisco

sáb. 8/24

Nonstop1h 21m

$63

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

sáb. 6/15

1 stop5h 48m

San Francisco

sáb. 6/15

1 stop5h 55m

$143

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

mié. 7/10

Nonstop2h 36m

Seattle/Tacoma Intl

vie. 7/19

Nonstop2h 33m

$155

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

sáb. 6/22

Nonstop2h 35m

Seattle/Tacoma Intl

mar. 6/25

Nonstop2h 33m

$177

Flights are sorted by cheapest first

Deals found on 5/22

No data available for this route at this time. Please check back soon.

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.

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 mayo 24, 2024.
Peruse reviews from past customers who have flown with Frontier, American Airlines and United 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
8.2
Very good
5,997 reviews

Crew

8.7

Overall

8.2

Comfort

8.1

Boarding

8.3

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
5,997 reviews
Southwest
8.2
Very good
5,997 reviews

Crew

8.7

Overall

8.2

Comfort

8.1

Boarding

8.3

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

8.1
Very good
9,175 reviews
Southwest
8.2
Very good
5,997 reviews

Crew

8.7

Overall

8.2

Comfort

8.1

Boarding

8.3

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

8.0
Very good
10,561 reviews
Southwest
8.2
Very good
5,997 reviews

Crew

8.7

Overall

8.2

Comfort

8.1

Boarding

8.3

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

8.0
Very good
2,298 reviews
Southwest
8.2
Very good
5,997 reviews

Crew

8.7

Overall

8.2

Comfort

8.1

Boarding

8.3

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

7.6
Good
4,417 reviews
Southwest
8.2
Very good
5,997 reviews

Crew

8.7

Overall

8.2

Comfort

8.1

Boarding

8.3

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

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.

  • Can I find flights from Ontario to USA for under $100 on Cheapflights?

    Yes, there are multiple flights from Ontario to USA for under $100. The cheapest flight booked recently is on Frontier for just $57, but on average you can expect to pay $68.

  • Are there nonstop flights from Ontario to USA for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from Ontario to USA under $100. A good price for a nonstop flight from Ontario to USA is less than $77.

  • Are there last-minute flights available from Ontario to USA for under $100?

    There are currently 20+ open flights from Ontario to USA within the next 7 days for less than $100.

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

  • What does ONT to LAX mean?

    ONT stands for Ontario Airport, while LAX stands for Los Angeles Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Ready for more IATA code knowledge? These are related airports for your current travel destination: San Francisco Airport (SFO), Miami Airport (MIA), New York John F Kennedy Intl Airport (JFK), Boston Logan Intl Airport (BOS), Atlanta Hartsfield-Jackson Airport (ATL).

  • Can I find deals for flights from Ontario to USA that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to USA flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to USA with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to USA flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • 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.

  • Can I find deals for flights from Ontario to USA that allow pets onboard?

    Many airlines flying from Ontario to USA offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to USA?

    Yes, you can often find last-minute deals on Ontario to USA flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to USA flight deals updated?

    The Ontario to USA flight deals you see on this page were last updated on 5/23.

  • When is the best time to book a flight from Ontario to USA?

    Currently, September is the cheapest month in which you can book a flight from Ontario to USA (average of $238). Flying from Ontario to USA in July is currently the most expensive (average of $323). 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

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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 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 2,725,499 searches. Data last updated mayo 24, 2024.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$35Average$303FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Spirit AirlinesCheapest$37Average$173FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
Breeze AirwaysCheapest$38Average$175FlexibilityNo cancel feeOn-timeN/A
Search Breeze Airways flights