Latest deals
Insights
FAQs
Reviews
Price Alerts

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 2/15. 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.
Search flight deals

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
10:14 pm - 11:25 pm
ONT
-
LAS
1h 11mnonstop
Frontier Logo
7:00 am - 8:06 am
LAS
-
ONT
1h 06mnonstop
$59Frontier
Sun, Mar 1 - Fri, Mar 13
Frontier Logo
2:46 pm - 4:00 pm
ONT
-
LAS
1h 14mnonstop
Frontier Logo
7:55 pm - 9:03 pm
LAS
-
ONT
1h 08mnonstop
$60Frontier
Sat, Mar 7 - Wed, Mar 11
Frontier Logo
7:22 pm - 8:31 pm
ONT
-
LAS
1h 09mnonstop
Frontier Logo
12:00 pm - 1:11 pm
LAS
-
ONT
1h 11mnonstop
$61Frontier
Thu, Mar 5 - Thu, Mar 12
American Airlines Logo
5:02 pm - 7:25 pm
ONT
-
PHX
1h 23mnonstop
American Airlines Logo
11:15 am - 11:36 am
PHX
-
ONT
1h 21mnonstop
$157American Airlines
Mon, Feb 23 - Sat, Feb 28
Delta Logo
1:20 pm - 11:59 pm
ONT
-
EWR
7h 39m
1 stop
Delta Logo
7:00 am - 12:23 pm
EWR
-
ONT
8h 23m
1 stop
$297Delta
Tue, Mar 10 - Tue, Mar 17
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
$316American Airlines
Wed, Feb 25 - Mon, Mar 2
United Airlines Logo
6:10 am - 1:19 pm
ONT
-
HNL
9h 09m
1 stop
United Airlines Logo
7:00 am - 10:57 pm
HNL
-
ONT
12h 57m
2 stops
$322United Airlines
Tue, Mar 3 - Tue, Mar 10
Southwest Logo
5:15 am - 10:15 am
ONT
-
HOU
3h 00mnonstop
Southwest Logo
3:35 pm - 5:10 pm
HOU
-
ONT
3h 35mnonstop
$333Southwest
Wed, Feb 25 - Wed, Mar 4
Southwest Logo
6:00 am - 12:45 pm
ONT
-
HOU
4h 45m
1 stop
Southwest Logo
10:50 pm - 12:25 am
HOU
-
ONT
3h 35mnonstop
$339Southwest
Wed, Mar 11 - Sat, Mar 21
Delta Logo
10:25 pm - 10:23 am
ONT
-
HOU
9h 58m
1 stop
Delta Logo
6:00 am - 11:47 am
HOU
-
ONT
7h 47m
1 stop
$353Delta
Tue, Mar 10 - Tue, Mar 17

Delta flights from Ontario to United States

Our best Delta deals on Ontario to United States flight tickets
Delta
May 6
ONT7:00 amOntario
3h 07m
SEA10:07 amSeattle/Tacoma Intl
May 10
SEA10:00 amSeattle/Tacoma Intl
2h 49m
ONT12:49 pmOntario
$167
Delta
Feb 17
ONT5:00 pmOntario
10h 25m
1 stop
JFK6:25 amNew York John F Kennedy Intl
Feb 23
JFK6:00 amNew York John F Kennedy Intl
9h 07m
1 stop
ONT12:07 pmOntario
$257
Delta
Feb 2
ONT3:30 pmOntario
3h 05m
SEA6:35 pmSeattle/Tacoma Intl
Feb 28
SEA7:55 pmSeattle/Tacoma Intl
2h 42m
ONT10:37 pmOntario
$274

American Airlines flights from Ontario to United States

Our best American Airlines deals on Ontario to United States flight tickets
American Airlines
Feb 7
ONT3:09 pmOntario
3h 02m
DFW8:11 pmDallas/Fort Worth
Feb 14
DFW9:24 pmDallas/Fort Worth
3h 25m
ONT10:49 pmOntario
$149
American Airlines
Feb 23
ONT5:02 pmOntario
1h 23m
PHX7:25 pmPhoenix Sky Harbor Intl
Feb 28
PHX11:15 amPhoenix Sky Harbor Intl
1h 21m
ONT11:36 amOntario
$157
American Airlines
Feb 7
ONT9:59 amOntario
1h 18m
PHX12:17 pmPhoenix Sky Harbor Intl
Feb 14
PHX6:47 pmPhoenix Sky Harbor Intl
1h 22m
ONT7:09 pmOntario
$159

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 January 27, 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

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 3/1

10:14 pm-11:25 pm

Nonstop1h 11m

Las Vegas Harry Reid Intl

Fri 3/13

7:00 am-8:06 am

Nonstop1h 06m

$59

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 3/7

2:46 pm-4:00 pm

Nonstop1h 14m

Las Vegas Harry Reid Intl

Wed 3/11

7:55 pm-9:03 pm

Nonstop1h 08m

$60

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 3/5

7:22 pm-8:31 pm

Nonstop1h 09m

Las Vegas Harry Reid Intl

Thu 3/12

12:00 pm-1:11 pm

Nonstop1h 11m

$61

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Mon 2/23

5:02 pm-7:25 pm

Nonstop1h 23m

Phoenix Sky Harbor Intl

Sat 2/28

11:15 am-11:36 am

Nonstop1h 21m

$157

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Tue 3/10

1:20 pm-11:59 pm

1 stop7h 39m

Newark

Tue 3/17

7:00 am-12:23 pm

1 stop8h 23m

$297

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Wed 2/25

12:18 pm-7:15 pm

1 stop8h 57m

Honolulu

Mon 3/2

11:00 pm-8:48 am

1 stop7h 48m

$316

OntarioHonolulu

ONT - HNL

ONTHNL

Ontario

Tue 3/3

6:10 am-1:19 pm

1 stop9h 09m

Honolulu

Tue 3/10

7:00 am-10:57 pm

2 stops12h 57m

$322

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Wed 2/25

5:15 am-10:15 am

Nonstop3h 00m

Houston Hobby

Wed 3/4

3:35 pm-5:10 pm

Nonstop3h 35m

$333

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Wed 3/11

6:00 am-12:45 pm

1 stop4h 45m

Houston Hobby

Sat 3/21

10:50 pm-12:25 am

Nonstop3h 35m

$339

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Tue 3/10

10:25 pm-10:23 am

1 stop9h 58m

Houston Hobby

Tue 3/17

6:00 am-11:47 am

1 stop7h 47m

$353

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $388. 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 $339 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

$96

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 $96. The best round-trip flight deal from Ontario to United States found on momondo in the last 72 hours is $86.
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?

  • 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
8,384 reviews
Search Spirit Airlines flights
FrontierPriceFrom $30Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
9,205 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $67Free CancellationRating
8.0
11,795 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $97Free CancellationRating
8.0
4,268 reviews
Search Southwest flights
JetBluePriceFrom $155Free CancellationRating
7.2
2,890 reviews
Search JetBlue flights
DeltaPriceFrom $178Free CancellationRating
7.9
8,119 reviews
Search Delta flights
American AirlinesPriceFrom $190Free CancellationRating
7.2
11,197 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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 2/26
Thu 3/5
By creating a price alert you accept our terms of use and privacy policy.

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
Flights to New Yorkfrom $38
Flights to Los Angelesfrom $31
Flights to Miamifrom $49
Flights to Chicagofrom $56
Flights to Orlandofrom $44
Flights to San Franciscofrom $73
Flights to Las Vegasfrom $53
Flights to Washington, D.C.from $49
Flights to Bostonfrom $52
Flights to Atlantafrom $44
Flights to Dallasfrom $54
Flights to Seattlefrom $56