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Cheap flights from Ontario to the United States from $54

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 3/7. 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

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Find the cheapest flights from Ontario to the United States

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:15 am - 11:10 am
ONT
-
DFW
26h 55m
1 stop
Frontier Logo
5:17 pm - 11:59 pm
DFW
-
ONT
8h 42m
1 stop
$131Frontier
Fri, Mar 6 - Wed, Mar 11
Frontier Logo
2:06 pm - 8:20 pm
ONT
-
SEA
6h 14m
1 stop
Frontier Logo
9:40 pm - 1:28 pm
SEA
-
ONT
15h 48m
1 stop
$131Frontier
Thu, Mar 19 - Mon, Mar 30
Frontier Logo
7:17 pm - 5:47 am
ONT
-
DFW
8h 30m
1 stop
Frontier Logo
5:17 pm - 11:59 pm
DFW
-
ONT
8h 42m
1 stop
$132Frontier
Wed, Mar 4 - Wed, Mar 11
Frontier Logo
7:17 pm - 5:47 am
ONT
-
DFW
8h 30m
1 stop
Frontier Logo
5:17 pm - 11:59 pm
DFW
-
ONT
8h 42m
1 stop
$134Frontier
Wed, Mar 4 - Tue, Mar 10
Delta Logo
10:15 pm - 9:29 am
ONT
-
EWR
8h 14m
1 stop
Delta Logo
7:10 am - 12:14 pm
EWR
-
ONT
8h 04m
1 stop
$257Delta
Sat, Apr 18 - Sat, Apr 25
United Airlines Logo
6:37 pm - 5:59 am
ONT
-
EWR
8h 22m
1 stop
United Airlines Logo
6:00 am - 12:18 pm
EWR
-
ONT
9h 18m
1 stop
$292United Airlines
Wed, Mar 4 - Wed, Mar 11
American Airlines Logo
12:18 pm - 7:15 pm
ONT
-
HNL
8h 57m
1 stop
American Airlines Logo
11:00 pm - 8:48 am
HNL
-
ONT
7h 48m
1 stop
$312American Airlines
Mon, Feb 23 - Mon, Mar 2
American Airlines Logo
12:18 pm - 7:15 pm
ONT
-
HNL
8h 57m
1 stop
American Airlines Logo
11:00 pm - 8:48 am
HNL
-
ONT
7h 48m
1 stop
$313American Airlines
Mon, Feb 23 - Mon, Mar 2
Southwest Logo
2:45 pm - 7:40 pm
ONT
-
HOU
2h 55mnonstop
Southwest Logo
8:55 pm - 10:30 pm
HOU
-
ONT
3h 35mnonstop
$333Southwest
Thu, Mar 19 - Thu, Mar 26
Southwest Logo
2:45 pm - 7:40 pm
ONT
-
HOU
2h 55mnonstop
Southwest Logo
8:05 am - 12:30 pm
HOU
-
ONT
6h 25m
1 stop
$339Southwest
Thu, Mar 19 - Thu, Mar 26

Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets
Frontier
Mar 6
ONT6:15 amOntario
26h 55m
1 stop
DFW11:10 amDallas/Fort Worth
Mar 11
DFW5:17 pmDallas/Fort Worth
8h 42m
1 stop
ONT11:59 pmOntario
$131
Frontier
Mar 4
ONT7:17 pmOntario
8h 30m
1 stop
DFW5:47 amDallas/Fort Worth
Mar 11
DFW5:17 pmDallas/Fort Worth
8h 42m
1 stop
ONT11:59 pmOntario
$132
Frontier
Mar 4
ONT7:17 pmOntario
8h 30m
1 stop
DFW5:47 amDallas/Fort Worth
Mar 10
DFW5:17 pmDallas/Fort Worth
8h 42m
1 stop
ONT11:59 pmOntario
$134

American Airlines flights from Ontario to United States

Our best American Airlines deals on Ontario to United States flight tickets
American Airlines
Feb 25
ONT12:18 pmOntario
7h 41m
1 stop
JFK10:59 pmNew York John F Kennedy Intl
Mar 4
JFK4:30 pmNew York John F Kennedy Intl
9h 19m
1 stop
ONT10:49 pmOntario
$251
American Airlines
Feb 16
ONT11:58 pmOntario
10h 26m
2 stops
JFK1:24 pmNew York John F Kennedy Intl
Feb 19
JFK2:30 pmNew York John F Kennedy Intl
9h 54m
1 stop
ONT9:24 pmOntario
$262
American Airlines
Feb 18
ONT11:58 pmOntario
10h 26m
2 stops
JFK1:24 pmNew York John F Kennedy Intl
Feb 21
JFK8:15 amNew York John F Kennedy Intl
13h 27m
2 stops
ONT6:42 pmOntario
$267

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to United States 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, momondo users made 832,500 searches. Data last updated February 4, 2026.
Use the filters below to find and compare flights from Ontario to the United States that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Fri 3/6

6:15 am-11:10 am

1 stop26h 55m

Dallas/Fort Worth

Wed 3/11

5:17 pm-11:59 pm

1 stop8h 42m

$131

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 3/19

2:06 pm-8:20 pm

1 stop6h 14m

Seattle/Tacoma Intl

Mon 3/30

9:40 pm-1:28 pm

1 stop15h 48m

$131

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Wed 3/4

7:17 pm-5:47 am

1 stop8h 30m

Dallas/Fort Worth

Wed 3/11

5:17 pm-11:59 pm

1 stop8h 42m

$132

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Wed 3/4

7:17 pm-5:47 am

1 stop8h 30m

Dallas/Fort Worth

Tue 3/10

5:17 pm-11:59 pm

1 stop8h 42m

$134

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Sat 4/18

10:15 pm-9:29 am

1 stop8h 14m

Newark

Sat 4/25

7:10 am-12:14 pm

1 stop8h 04m

$257

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Wed 3/4

6:37 pm-5:59 am

1 stop8h 22m

Newark

Wed 3/11

6:00 am-12:18 pm

1 stop9h 18m

$292

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Mon 2/23

12:18 pm-7:15 pm

1 stop8h 57m

Honolulu

Mon 3/2

11:00 pm-8:48 am

1 stop7h 48m

$312

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Mon 2/23

12:18 pm-7:15 pm

1 stop8h 57m

Honolulu

Mon 3/2

11:00 pm-8:48 am

1 stop7h 48m

$313

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Thu 3/19

2:45 pm-7:40 pm

Nonstop2h 55m

Houston Hobby

Thu 3/26

8:55 pm-10:30 pm

Nonstop3h 35m

$333

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Thu 3/19

2:45 pm-7:40 pm

Nonstop2h 55m

Houston Hobby

Thu 3/26

8:05 am-12:30 pm

1 stop6h 25m

$339

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 $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 $386. 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 $333 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

$103

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 $103. The best round-trip flight deal from Ontario to United States found on momondo in the last 72 hours is $87.
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 Phoenix Sky Harbor Intl (PHX), San Francisco (SFO).
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?

  • 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 $24Free CancellationRating
6.3
8,407 reviews
Search Spirit Airlines flights
FrontierPriceFrom $31Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $67Free CancellationRating
8.0
11,834 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $97Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
JetBluePriceFrom $155Free CancellationRating
7.2
2,893 reviews
Search JetBlue flights
DeltaPriceFrom $178Free CancellationRating
7.9
8,138 reviews
Search Delta flights
American AirlinesPriceFrom $190Free CancellationRating
7.2
11,218 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

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