How many flights depart from Ontario to United States on average per week?

As of November 2025, there are 377 flights per week flying from Ontario to United States. The most common day of the week flights depart is Mon, with 23% of flights taking off on this day.

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

Historically, on average around 12% of flights between Ontario and United States have experienced a delay on any given week. The average delay length over the past 12 months has been 126 minutes.

How many flights depart from Ontario to United States on average per day?

As of November 2025, there are 53 flights per day flying from Ontario to United States. The most common time of day flights depart is 7:00AM, with 37% of flights taking off at noon.

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

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

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

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

What airlines fly to United States?

Frontier, Spirit Airlines and United Airlines are the top three most popular airlines that fly to United States from Ontario according to our data. Frontier is the first choice among our users, with 37% of people opting to fly with this airline when traveling to United States. Keep in mind that there are 12 different airlines that fly to United States on a routine basis, so you have a few additional options to choose from.

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

According to our data, Eastern Airlines have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

What is the cheapest airline that flies from Ontario to United States?

Frontier, Southwest, and Alaska Airlines are the most popular carriers operating from Ontario to United States

When did momondo last update prices for flights from Ontario Airport to United States?

Prices for flights from Ontario Airport to United States refresh daily.

How many operators does momondo search for flights from Ontario Airport to United States?

As of November 2025, there are 9 operators available to choose from for flights from Ontario Airport to United States.

How old do you have to be to fly from Ontario Airport to United States?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to United States.

What documentation or ID do you need to fly to United States?

The necessary travel and health documents for your United States trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$34 Cheap Flights from Ontario to the United States in 2025/26

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3:22 pm - 4:34 pmONT-LAS

1h 12mnonstop

6:45 pm - 7:53 pmLAS-ONT

1h 08mnonstop

$53Frontier

Find Deal

Thu, Feb 5 - Thu, Feb 5

6:15 am - 7:22 amONT-LAS

1h 07mnonstop

8:13 pm - 9:17 pmLAS-ONT

1h 04mnonstop

$56Frontier

Find Deal

Tue, Dec 16 - Wed, Dec 17

6:00 am - 12:57 pmONT-SEA

6h 57m1 stop

8:15 am - 11:02 amSEA-ONT

2h 47mnonstop

$129Delta

Find Deal

Tue, Dec 16 - Sun, Jan 4

6:00 am - 8:57 amONT-SEA

2h 57mnonstop

12:31 pm - 3:08 pmSEA-ONT

2h 37mnonstop

$137Alaska Airlines

Find Deal

Fri, Dec 19 - Mon, Jan 12

12:02 pm - 2:52 pmONT-SEA

2h 50mnonstop

8:56 pm - 11:32 pmSEA-ONT

2h 36mnonstop

$138Alaska Airlines

Find Deal

Sat, Feb 14 - Fri, Feb 20

6:00 am - 12:33 pmONT-SEA

6h 33m1 stop

5:30 am - 12:16 pmSEA-ONT

6h 46m1 stop

$139Delta

Find Deal

Sat, Jan 24 - Tue, Jan 27

11:59 pm - 11:25 amONT-LGA

8h 26m1 stop

10:35 am - 6:45 pmLGA-ONT

11h 10m1 stop

$193American Airlines

Find Deal

Fri, Jan 30 - Tue, Feb 3

11:59 pm - 11:55 amONT-LGA

8h 56m2 stops

4:05 pm - 10:48 pmLGA-ONT

9h 43m1 stop

$198American Airlines

Find Deal

Fri, Jan 30 - Tue, Feb 3

6:39 pm - 5:59 amONT-EWR

8h 20m1 stop

2:07 pm - 8:58 pmEWR-ONT

9h 51m1 stop

$292United Airlines

Find Deal

Fri, Jan 9 - Tue, Jan 13

5:05 am - 5:30 pmONT-EWR

9h 25m1 stop

4:40 pm - 10:53 pmEWR-ONT

9h 13m1 stop

$295United Airlines

Find Deal

Sun, Dec 7 - Sat, Jan 17

Southwest flights from Ontario to United States

Our best Southwest deals on Ontario to United States flight tickets

Southwest

Dec 25

ONT3:10 pmOntario

7h 20m

1 stop

SEA10:30 pmSeattle/Tacoma Intl

Jan 3

SEA7:05 amSeattle/Tacoma Intl

6h 55m

1 stop

ONT2:00 pmOntario

$151

Find similar

Southwest

Dec 13

ONT5:30 amOntario

6h 30m

1 stop

SFO12:00 pmSan Francisco

Dec 15

SFO5:20 amSan Francisco

4h 15m

1 stop

ONT9:35 amOntario

$154

Find similar

Southwest

Dec 9

ONT5:55 amOntario

5h 35m

1 stop

SFO11:30 amSan Francisco

Dec 10

SFO9:25 amSan Francisco

5h 55m

1 stop

ONT3:20 pmOntario

$157

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Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets

Frontier

Feb 5

ONT3:22 pmOntario

1h 12m

LAS4:34 pmLas Vegas Harry Reid Intl

Feb 5

LAS6:45 pmLas Vegas Harry Reid Intl

1h 08m

ONT7:53 pmOntario

$53

Find similar

Frontier

Dec 16

ONT6:15 amOntario

1h 07m

LAS7:22 amLas Vegas Harry Reid Intl

Dec 17

LAS8:13 pmLas Vegas Harry Reid Intl

1h 04m

ONT9:17 pmOntario

$56

Find similar

Frontier

Dec 16

ONT6:15 amOntario

1h 07m

LAS7:22 amLas Vegas Harry Reid Intl

Dec 16

LAS8:13 pmLas Vegas Harry Reid Intl

1h 04m

ONT9:17 pmOntario

$57

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Fly from

Fly to

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 2/5

3:22 pm-4:34 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Thu 2/5

6:45 pm-7:53 pm

Nonstop1h 08m

$53

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 12/16

6:15 am-7:22 am

Nonstop1h 07m

Las Vegas Harry Reid Intl

Wed 12/17

8:13 pm-9:17 pm

Nonstop1h 04m

$56

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 12/16

6:00 am-12:57 pm

1 stop6h 57m

Seattle/Tacoma Intl

Sun 1/4

8:15 am-11:02 am

Nonstop2h 47m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 12/19

6:00 am-8:57 am

Nonstop2h 57m

Seattle/Tacoma Intl

Mon 1/12

12:31 pm-3:08 pm

Nonstop2h 37m

$137

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 2/14

12:02 pm-2:52 pm

Nonstop2h 50m

Seattle/Tacoma Intl

Fri 2/20

8:56 pm-11:32 pm

Nonstop2h 36m

$138

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 1/24

6:00 am-12:33 pm

1 stop6h 33m

Seattle/Tacoma Intl

Tue 1/27

5:30 am-12:16 pm

1 stop6h 46m

$139

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Fri 1/30

11:59 pm-11:25 am

1 stop8h 26m

New York LaGuardia

Tue 2/3

10:35 am-6:45 pm

1 stop11h 10m

$193

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Fri 1/30

11:59 pm-11:55 am

2 stops8h 56m

New York LaGuardia

Tue 2/3

4:05 pm-10:48 pm

1 stop9h 43m

$198

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Fri 1/9

6:39 pm-5:59 am

1 stop8h 20m

Newark

Tue 1/13

2:07 pm-8:58 pm

1 stop9h 51m

$292

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Sun 12/7

5:05 am-5:30 pm

1 stop9h 25m

Newark

Sat 1/17

4:40 pm-10:53 pm

1 stop9h 13m

$295

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How to get the cheapest flight ticket from Ontario to United States

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Other information

What is the cheapest month to fly to United States?

In general, January is the cheapest month to fly from Ontario to United States. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $256. If you aren’t able to travel during the month of January, then book flights to United States from Ontario during February instead. Flights to United States in February, while not as cheap as those in January, still average around $312.

What is the cheapest day to depart on your flight to United States?

According to our data, Saturday is the cheapest day to fly to United States from Ontario. The lowest ticket price found for a Saturday departure recently was $335. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Wednesday because tickets tend to average around $387. These prices are subject to change though, so be sure to set up a Price Alert for flights to United States.

What is the cheapest time of day to depart on your flight to United States?

The cheapest time of day to fly to United States is in the afternoon when flights can be purchased for as low as $309. Try not to purchase tickets in the evening because they tend to be around $359. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Ontario to United States flight route?

Fly from Ontario to San Francisco for the best Ontario - United States flight prices

How far in advance should I book a flight to United States?

You are more likely to see cheaper flights to United States from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to United States for around $349 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United States from Ontario for as low as $272 on momondo.

What cabin class options are available on Ontario to United States flights?

There are 4 cabin classes available to choose from on Ontario to United States flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to United States flights?

No. A direct flight is the cheapest option for a flight between Ontario to United States.

Cheap Ontario to United States flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to United States

Best Price Found	$77
Direct flights	Every day
Airports in United States	1 airport

The best one-way flight to United States from Ontario in the past 72 hours is $77. The best round-trip flight deal from Ontario to United States found on momondo in the last 72 hours is $135.

Direct flights go from Ontario to United States every day.

There is 1 airport near United States: Las Vegas Harry Reid Intl (LAS)

Search flight deals

When did momondo last update prices for flights from Ontario Airport to United States?
Prices for flights from Ontario Airport to United States refresh daily.
How many operators does momondo search for flights from Ontario Airport to United States?
As of November 2025, there are 9 operators available to choose from for flights from Ontario Airport to United States.
How old do you have to be to fly from Ontario Airport to United States?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to United States.
What documentation or ID do you need to fly to United States?
The necessary travel and health documents for your United States trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Ontario to United States?
Based on momondo bookings for flights between Ontario and United States, the leading plane model is Airbus A320neo, making up 14.01% of the total bookings. Other popular models include Boeing 737 MAX 8 with 11.82%, Airbus A321neo with 9.36%, and Boeing 737-800 Passenger/BBJ2 (winglets) with 9.26%.

Best airlines flying from Ontario to United States

Compare and see reviews for airlines that fly from Ontario to United States with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $24	Free Cancellation	Rating 6.3 8,158 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $36	Free Cancellation	Rating 5.8 3,100 reviews	Search Frontier flights
United Airlines	PriceFrom $58	Free Cancellation	Rating 7.4 9,046 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $67	Free Cancellation	Rating 8.0 11,357 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $97	Free Cancellation	Rating 8.0 4,253 reviews	Search Southwest flights
Delta	PriceFrom $178	Free Cancellation	Rating 7.9 7,998 reviews	Search Delta flights
JetBlue	PriceFrom $237	Free Cancellation	Rating 7.2 2,905 reviews	Search JetBlue flights
American Airlines	PriceFrom $242	Free Cancellation	Rating 7.2 11,038 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to United States?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to United States for you.

Can I find flights from Ontario to United States with flexible booking policies on momondo?

Yes. All flights to United States from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to United States?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to United States from Ontario.

I’m not ready to book a flight from Ontario to United States right now. Can momondo alert me if prices change?

If you are simply researching potential flights to United States, momondo offers a useful price alert feature which will track prices for flights to United States from Ontario and alert you when they change.

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We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Find better results for your trip to the United States

Popular cities in the United States

Flights to New Yorkfrom $33

Flights to Los Angelesfrom $49

Flights to Miamifrom $48

Flights to Chicagofrom $58

Flights to Orlandofrom $48

Flights to Las Vegasfrom $49

Flights to San Franciscofrom $57

Flights to Washington, D.C.from $38

Flights to Bostonfrom $59

Flights to Atlantafrom $48

Flights to Dallasfrom $54

Flights to Seattlefrom $58

Cheap flights from Ontario to the United States from $34

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to the United States departing on 1/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Filter for what you want

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Southwest flights from Ontario to United States

Our best Southwest deals on Ontario to United States flight tickets

Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets

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How to get the cheapest flight ticket from Ontario to United States

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to United States?

What is the cheapest day to depart on your flight to United States?

What is the cheapest time of day to depart on your flight to United States?

The cheapest time of day to fly to United States is in the afternoon when flights can be purchased for as low as $309. Try not to purchase tickets in the evening because they tend to be around $359. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Ontario to United States flight route?

Fly from Ontario to San Francisco for the best Ontario - United States flight prices

How far in advance should I book a flight to United States?

What cabin class options are available on Ontario to United States flights?

There are 4 cabin classes available to choose from on Ontario to United States flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to United States flights?

No. A direct flight is the cheapest option for a flight between Ontario to United States.

What is the cheapest airline that flies from Ontario to United States?

Frontier, Southwest, and Alaska Airlines are the most popular carriers operating from Ontario to United States

What airlines fly to United States?

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

Historically, on average around 12% of flights between Ontario and United States have experienced a delay on any given week. The average delay length over the past 12 months has been 126 minutes.

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

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

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

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

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

According to our data, Eastern Airlines have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

How many flights depart from Ontario to United States on average per day?

As of November 2025, there are 53 flights per day flying from Ontario to United States. The most common time of day flights depart is 7:00AM, with 37% of flights taking off at noon.

How many flights depart from Ontario to United States on average per week?

As of November 2025, there are 377 flights per week flying from Ontario to United States. The most common day of the week flights depart is Mon, with 23% of flights taking off on this day.

Cheap Ontario to United States flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to United States

Best Price Found

Direct flights

Airports in United States

When did momondo last update prices for flights from Ontario Airport to United States?

How many operators does momondo search for flights from Ontario Airport to United States?

How old do you have to be to fly from Ontario Airport to United States?

What documentation or ID do you need to fly to United States?

What is the most popular plane model from Ontario to United States?

Best airlines flying from Ontario to United States

Compare and see reviews for airlines that fly from Ontario to United States with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to United States?

Can I find flights from Ontario to United States with flexible booking policies on momondo?

How can momondo help me find flights from Ontario to United States?

I’m not ready to book a flight from Ontario to United States right now. Can momondo alert me if prices change?

An easier way to manage your United States trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo