Cheap flights from Ontario to the United States from $28

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 7/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from Ontario to the United States

Cheap round-trip flights

Frontier Logo
6:00 am - 7:13 amONT-LAS
1h 13mnonstop
Frontier Logo
3:08 pm - 4:19 pmLAS-ONT
1h 11mnonstop
$37Frontier
Find Deal
lun., jul. 28 - jue., jul. 31
Frontier Logo
12:28 pm - 1:40 pmONT-LAS
1h 12mnonstop
Frontier Logo
6:30 am - 7:33 amLAS-ONT
1h 03mnonstop
$46Frontier
Find Deal
jue., ago. 21 - dom., ago. 24
United Airlines Logo
6:39 pm - 8:06 pmONT-SFO
1h 27mnonstop
United Airlines Logo
10:45 am - 12:14 pmSFO-ONT
1h 29mnonstop
$57United Airlines
Find Deal
mié., jul. 23 - mar., ago. 12
United Airlines Logo
6:10 am - 7:37 amONT-SFO
1h 27mnonstop
United Airlines Logo
10:45 am - 12:14 pmSFO-ONT
1h 29mnonstop
$112United Airlines
Find Deal
mar., jul. 29 - mar., jul. 29
Southwest Logo
7:10 pm - 12:05 amONT-SEA
4h 55m1 stop
Southwest Logo
6:15 am - 12:10 pmSEA-ONT
5h 55m1 stop
$114Southwest
Find Deal
mar., ago. 5 - mar., ago. 12
Southwest Logo
5:25 am - 10:15 amONT-SEA
4h 50m1 stop
Southwest Logo
3:50 pm - 9:00 pmSEA-ONT
5h 10m1 stop
$124Southwest
Find Deal
sáb., ago. 16 - mié., sep. 3
American Airlines Logo
6:10 am - 11:13 amONT-DFW
3h 03mnonstop
American Airlines Logo
9:05 am - 9:58 amDFW-ONT
2h 53mnonstop
$149American Airlines
Find Deal
sáb., ago. 30 - mar., sep. 2
American Airlines Logo
6:10 am - 5:52 pmONT-LGA
8h 42m1 stop
American Airlines Logo
7:30 am - 1:39 pmLGA-ONT
9h 09m1 stop
$173American Airlines
Find Deal
mar., ago. 5 - mar., ago. 12
Delta Logo
10:00 pm - 8:15 amONT-LGA
7h 15m1 stop
Delta Logo
1:59 pm - 7:11 pmLGA-ONT
8h 12m1 stop
$276Delta
Find Deal
lun., ago. 11 - mar., ago. 19
Delta Logo
7:05 am - 7:35 pmONT-JFK
9h 30m1 stop
Delta Logo
1:30 pm - 7:11 pmJFK-ONT
8h 41m1 stop
$276Delta
Find Deal
sáb., ago. 9 - lun., ago. 18

United Airlines flights from Ontario to United States

Our best United Airlines deals on Ontario to United States flight tickets
United Airlines
Jul 23
ONT6:39 pmOntario
1h 27m
SFO8:06 pmSan Francisco
Aug 12
SFO10:45 amSan Francisco
1h 29m
ONT12:14 pmOntario
United Airlines
Jul 17
ONT6:10 amOntario
1h 27m
SFO7:37 amSan Francisco
Jul 26
SFO9:25 pmSan Francisco
1h 27m
ONT10:52 pmOntario
United Airlines
Jul 29
ONT6:10 amOntario
1h 27m
SFO7:37 amSan Francisco
Jul 29
SFO10:45 amSan Francisco
1h 29m
ONT12:14 pmOntario

Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets
Frontier
Jul 28
ONT6:00 amOntario
1h 13m
LAS7:13 amLas Vegas Harry Reid Intl
Jul 31
LAS3:08 pmLas Vegas Harry Reid Intl
1h 11m
ONT4:19 pmOntario
Frontier
Aug 21
ONT12:28 pmOntario
1h 12m
LAS1:40 pmLas Vegas Harry Reid Intl
Aug 24
LAS6:30 amLas Vegas Harry Reid Intl
1h 03m
ONT7:33 amOntario
Frontier
Aug 13
ONT7:00 amOntario
1h 11m
LAS8:11 amLas Vegas Harry Reid Intl
Aug 16
LAS8:45 pmLas Vegas Harry Reid Intl
1h 07m
ONT9:52 pmOntario

See travel insights to the United States from

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?

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 $277. If you aren’t able to travel during the month of January, then book flights to United States from Ontario during September instead. Flights to United States in September, while not as cheap as those in January, still average around $284.

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

According to our data, Monday is the cheapest day to fly to United States from Ontario. The lowest ticket price found for a Monday departure recently was $332. 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 $374. 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 $356. 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 $359 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 $260 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

$28

Fastest flight time

1h 05m

Direct flights

Every day

Airports in United States

5 airports
The best one-way flight to United States from Ontario in the past 72 hours is $28. The best round-trip flight deal from Ontario to United States found on momondo in the last 72 hours is $37.
The fastest flight from Ontario to United States takes 1h 05m
Direct flights go from Ontario to United States every day.
There are 5 airports near United States: Dallas/Fort Worth (DFW), Denver Intl (DEN), San Francisco (SFO), Seattle/Tacoma Intl (SEA), Las Vegas Harry Reid Intl (LAS)

  • 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?

  • 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?


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 AirlinesPriceFrom $22Free CancellationRating
6.3
8,055 reviews
Search Spirit Airlines flights
FrontierPriceFrom $35Free CancellationRating
5.9
3,271 reviews
Search Frontier flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
8,846 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $67Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
DeltaPriceFrom $85Free CancellationRating
8.0
7,952 reviews
Search Delta flights
SouthwestPriceFrom $98Free CancellationRating
8.0
4,250 reviews
Search Southwest flights
JetBluePriceFrom $207Free CancellationRating
7.3
2,910 reviews
Search JetBlue flights
American AirlinesPriceFrom $244Free CancellationRating
7.2
10,000 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.


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.
1 adult
mar. 7/15
mar. 7/22

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