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

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

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

As of January 2026, there are 41 flights per day flying from Ontario to United States. The most common time of day flights depart is 12:00PM, with 40% of flights taking off in the afternoon.

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

Historically, on average around 13% 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 124 minutes.

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

As of January 2026, there are 293 flights per week flying from Ontario to United States. The most common day of the week flights depart is Mon, with 19% of flights taking off on this day.

What airlines fly to United States?

Frontier, United Airlines and Spirit 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 36% 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.

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. Monday 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, Delta have had the least number of delays on this route over the last 12 months; with about 4% of their flights experiencing any sort of delay.

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 January 2026, 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.

$30 Cheap Flights from Ontario to the United States in 2026

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Find the cheapest flights from Ontario to the United States

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Cheap round-trip flights

Enter your travel dates to find the best prices.

3:22 pm - 4:34 pm

ONT

LAS

1h 12mnonstop

12:00 pm - 1:11 pm

LAS

ONT

1h 11mnonstop

$59Frontier

Tue, Feb 10 - Thu, Feb 12

3:22 pm - 4:34 pm

ONT

LAS

1h 12mnonstop

12:41 pm - 1:52 pm

LAS

ONT

1h 11mnonstop

$60Frontier

Tue, Feb 10 - Wed, Feb 11

5:05 pm - 12:01 am

ONT

SEA

6h 56m

1 stop

5:45 pm - 11:44 pm

SEA

ONT

5h 59m

1 stop

$119Delta

Mon, May 11 - Tue, May 19

12:02 pm - 2:52 pm

ONT

SEA

2h 50mnonstop

8:30 am - 11:08 am

SEA

ONT

2h 38mnonstop

$148Hawaiian Airlines

Sat, Feb 28 - Sun, Mar 1

5:00 pm - 12:09 am

ONT

SEA

7h 09m

1 stop

7:55 pm - 10:37 pm

SEA

ONT

2h 42mnonstop

$149Delta

Tue, Feb 17 - Thu, Feb 19

6:14 am - 9:09 am

ONT

SEA

2h 55mnonstop

8:30 am - 11:08 am

SEA

ONT

2h 38mnonstop

$150Hawaiian Airlines

Sat, Feb 28 - Sun, Mar 1

10:37 pm - 10:09 am

ONT

JFK

8h 32m

1 stop

12:29 pm - 7:09 pm

JFK

ONT

9h 40m

1 stop

$251American Airlines

Tue, Feb 17 - Tue, Feb 24

10:37 pm - 10:09 am

ONT

JFK

8h 32m

1 stop

8:19 am - 4:22 pm

JFK

ONT

11h 03m

1 stop

$254American Airlines

Tue, Feb 17 - Wed, Mar 11

2:50 pm - 7:45 pm

ONT

HOU

2h 55mnonstop

9:30 pm - 11:05 pm

HOU

ONT

3h 35mnonstop

$333Southwest

Sat, Mar 7 - Tue, Mar 10

6:00 am - 12:45 pm

ONT

HOU

4h 45m

1 stop

9:30 pm - 11:05 pm

HOU

ONT

3h 35mnonstop

$339Southwest

Wed, Mar 11 - Wed, Mar 18

Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets

Frontier

Feb 10

ONT3:22 pmOntario

1h 12m

LAS4:34 pmLas Vegas Harry Reid Intl

Feb 13

LAS6:15 amLas Vegas Harry Reid Intl

1h 07m

ONT7:22 amOntario

$59

Frontier

Feb 10

ONT3:22 pmOntario

1h 12m

LAS4:34 pmLas Vegas Harry Reid Intl

Feb 11

LAS12:41 pmLas Vegas Harry Reid Intl

1h 11m

ONT1:52 pmOntario

$60

Frontier

Feb 12

ONT3:24 pmOntario

1h 12m

LAS4:36 pmLas Vegas Harry Reid Intl

Feb 16

LAS4:39 pmLas Vegas Harry Reid Intl

1h 09m

ONT5:48 pmOntario

$61

Southwest flights from Ontario to United States

Our best Southwest deals on Ontario to United States flight tickets

Southwest

Feb 19

ONT4:05 pmOntario

6h 25m

1 stop

SEA10:30 pmSeattle/Tacoma Intl

Feb 26

SEA4:30 pmSeattle/Tacoma Intl

7h 05m

1 stop

ONT11:35 pmOntario

$151

Southwest

Jan 27

ONT5:45 pmOntario

4h 05m

1 stop

SFO9:50 pmSan Francisco

Feb 4

SFO5:05 amSan Francisco

8h 45m

2 stops

ONT1:50 pmOntario

$436

Fly from

Fly to

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 2/10

3:22 pm-4:34 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Thu 2/12

12:00 pm-1:11 pm

Nonstop1h 11m

$59

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 2/10

3:22 pm-4:34 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

Wed 2/11

12:41 pm-1:52 pm

Nonstop1h 11m

$60

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Mon 5/11

5:05 pm-12:01 am

1 stop6h 56m

Seattle/Tacoma Intl

Tue 5/19

5:45 pm-11:44 pm

1 stop5h 59m

$119

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 2/28

12:02 pm-2:52 pm

Nonstop2h 50m

Seattle/Tacoma Intl

Sun 3/1

8:30 am-11:08 am

Nonstop2h 38m

$148

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 2/17

5:00 pm-12:09 am

1 stop7h 09m

Seattle/Tacoma Intl

Thu 2/19

7:55 pm-10:37 pm

Nonstop2h 42m

$149

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 2/28

6:14 am-9:09 am

Nonstop2h 55m

Seattle/Tacoma Intl

Sun 3/1

8:30 am-11:08 am

Nonstop2h 38m

$150

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Tue 2/17

10:37 pm-10:09 am

1 stop8h 32m

New York John F Kennedy Intl

Tue 2/24

12:29 pm-7:09 pm

1 stop9h 40m

$251

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Tue 2/17

10:37 pm-10:09 am

1 stop8h 32m

New York John F Kennedy Intl

Wed 3/11

8:19 am-4:22 pm

1 stop11h 03m

$254

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Sat 3/7

2:50 pm-7:45 pm

Nonstop2h 55m

Houston Hobby

Tue 3/10

9:30 pm-11:05 pm

Nonstop3h 35m

$333

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Wed 3/11

6:00 am-12:45 pm

1 stop4h 45m

Houston Hobby

Wed 3/18

9:30 pm-11:05 pm

Nonstop3h 35m

$339

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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 $280. 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 $286.

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

According to our data, Sunday is the cheapest day to fly to United States from Ontario. The lowest ticket price found for a Sunday departure recently was $336. 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 Thursday because tickets tend to average around $389. 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 Ontario to United States flight route?

Fly from Ontario to Las Vegas Harry Reid Intl 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 $335 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 $267 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	$107
Fastest flight time	1h 05m
Direct flights	Every day
Airports in United States	4,296 airports

The best one-way flight to United States from Ontario in the past 72 hours is $107. The best round-trip flight deal from Ontario to United States found on momondo in the last 72 hours is $84.

The fastest flight from Ontario to United States takes 1h 05m

Direct flights go from Ontario to United States every day.

There are 4,296 airports in United States. From Ontario there are direct flights to 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 January 2026, 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 A321neo, making up 11.38% of the total bookings. Other popular models include Airbus A320neo with 11.30%, Boeing 737 MAX 8 with 11.20%, and Boeing 737-800 Passenger/BBJ2 (winglets) with 11.02%.

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 8,359 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $30	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
United Airlines	PriceFrom $58	Free Cancellation	Rating 7.4 9,189 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $67	Free Cancellation	Rating 8.0 11,764 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $97	Free Cancellation	Rating 8.0 4,266 reviews	Search Southwest flights
JetBlue	PriceFrom $155	Free Cancellation	Rating 7.2 2,891 reviews	Search JetBlue flights
Delta	PriceFrom $178	Free Cancellation	Rating 7.9 8,085 reviews	Search Delta flights
American Airlines	PriceFrom $190	Free Cancellation	Rating 7.2 11,169 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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Popular cities in the United States

Flights to New Yorkfrom $49

Flights to Los Angelesfrom $46

Flights to Miamifrom $34

Flights to Chicagofrom $57

Flights to Orlandofrom $49

Flights to San Franciscofrom $48

Flights to Las Vegasfrom $46

Flights to Washington, D.C.from $52

Flights to Bostonfrom $59

Flights to Atlantafrom $49

Flights to Dallasfrom $62

Flights to Seattlefrom $56

Cheap flights from Ontario to the United States from $29

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 1/30. 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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Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets

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Our best Southwest deals on Ontario to United States flight tickets

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

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

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 Ontario to United States flight route?

Fly from Ontario to Las Vegas Harry Reid Intl 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 United 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 13% 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 124 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. Monday 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, Delta have had the least number of delays on this route over the last 12 months; with about 4% of their flights experiencing any sort of delay.

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

As of January 2026, there are 41 flights per day flying from Ontario to United States. The most common time of day flights depart is 12:00PM, with 40% of flights taking off in the afternoon.

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

As of January 2026, there are 293 flights per week flying from Ontario to United States. The most common day of the week flights depart is Mon, with 19% 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

Fastest flight time

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