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Cheap flights from Ontario to the United States from $32

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 1/11. 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
2:48 pm - 4:02 pm
ONT
-
LAS
1h 14mnonstop
Frontier Logo
9:00 am - 10:09 am
LAS
-
ONT
1h 09mnonstop
$49Frontier
dom., ene. 25 - jue., ene. 29
Frontier Logo
3:07 pm - 4:19 pm
ONT
-
LAS
1h 12mnonstop
Frontier Logo
8:15 am - 9:23 am
LAS
-
ONT
1h 08mnonstop
$53Frontier
mar., ene. 20 - vie., ene. 23
Hawaiian Airlines Logo
4:03 pm - 6:54 pm
ONT
-
SEA
2h 51mnonstop
Hawaiian Airlines Logo
8:25 am - 1:06 pm
SEA
-
ONT
4h 41m1 stop
$127Hawaiian Airlines
sáb., ene. 17 - dom., ene. 18
Hawaiian Airlines Logo
11:53 am - 2:44 pm
ONT
-
SEA
2h 51mnonstop
Hawaiian Airlines Logo
8:25 am - 1:06 pm
SEA
-
ONT
4h 41m1 stop
$128Hawaiian Airlines
sáb., ene. 17 - dom., ene. 18
Delta Logo
3:30 pm - 6:35 pm
ONT
-
SEA
3h 05mnonstop
Delta Logo
6:05 pm - 10:38 pm
SEA
-
ONT
4h 33m1 stop
$130Delta
sáb., ene. 10 - dom., ene. 11
Southwest Logo
3:40 pm - 12:10 am
ONT
-
SEA
8h 30m1 stop
Southwest Logo
2:15 pm - 10:20 pm
SEA
-
ONT
8h 05m1 stop
$131Southwest
vie., feb. 27 - lun., mar. 2
Southwest Logo
6:30 am - 4:10 pm
ONT
-
LGA
6h 40m1 stop
Southwest Logo
9:50 am - 5:35 pm
LGA
-
ONT
10h 45m1 stop
$157Southwest
mié., ene. 7 - dom., ene. 11
American Airlines Logo
3:09 pm - 10:46 pm
ONT
-
HOU
5h 37m1 stop
American Airlines Logo
6:00 am - 10:08 am
HOU
-
ONT
6h 08m1 stop
$159American Airlines
mar., feb. 3 - mié., feb. 11
American Airlines Logo
11:59 pm - 11:30 am
ONT
-
JFK
8h 31m1 stop
American Airlines Logo
8:25 am - 4:05 pm
JFK
-
ONT
10h 40m1 stop
$159American Airlines
jue., ene. 8 - mié., ene. 14
Delta Logo
10:30 pm - 10:21 am
ONT
-
HOU
9h 51m1 stop
Delta Logo
5:45 am - 11:31 am
HOU
-
ONT
7h 46m1 stop
$217Delta
vie., ene. 30 - mar., feb. 3

Southwest flights from Ontario to United States

Our best Southwest deals on Ontario to United States flight tickets
Southwest
Feb 27
ONT3:40 pmOntario
8h 30m
1 stop
SEA12:10 amSeattle/Tacoma Intl
Mar 2
SEA2:15 pmSeattle/Tacoma Intl
8h 05m
1 stop
ONT10:20 pmOntario
$131
Find similar
Southwest
Jan 17
ONT6:35 amOntario
6h 05m
1 stop
SEA12:40 pmSeattle/Tacoma Intl
Jan 18
SEA1:20 pmSeattle/Tacoma Intl
7h 45m
1 stop
ONT9:05 pmOntario
$136
Find similar
Southwest
Jan 12
ONT3:25 pmOntario
7h 10m
1 stop
SEA10:35 pmSeattle/Tacoma Intl
Jan 14
SEA9:30 amSeattle/Tacoma Intl
6h 35m
1 stop
ONT4:05 pmOntario
$142
Find similar

Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets
Frontier
Jan 25
ONT2:48 pmOntario
1h 14m
LAS4:02 pmLas Vegas Harry Reid Intl
Jan 29
LAS9:00 amLas Vegas Harry Reid Intl
1h 09m
ONT10:09 amOntario
$49
Find similar
Frontier
Jan 20
ONT3:07 pmOntario
1h 12m
LAS4:19 pmLas Vegas Harry Reid Intl
Jan 23
LAS8:15 amLas Vegas Harry Reid Intl
1h 08m
ONT9:23 amOntario
$53
Find similar
Frontier
Jan 20
ONT3:07 pmOntario
1h 12m
LAS4:19 pmLas Vegas Harry Reid Intl
Jan 23
LAS12:21 pmLas Vegas Harry Reid Intl
1h 11m
ONT1:32 pmOntario
$54
Find similar

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 diciembre 4, 2025.
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

dom. 1/25

2:48 pm-4:02 pm

Nonstop1h 14m

Las Vegas Harry Reid Intl

jue. 1/29

9:00 am-10:09 am

Nonstop1h 09m

$49

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

mar. 1/20

3:07 pm-4:19 pm

Nonstop1h 12m

Las Vegas Harry Reid Intl

vie. 1/23

8:15 am-9:23 am

Nonstop1h 08m

$53

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 1/17

4:03 pm-6:54 pm

Nonstop2h 51m

Seattle/Tacoma Intl

dom. 1/18

8:25 am-1:06 pm

1 stop4h 41m

$127

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 1/17

11:53 am-2:44 pm

Nonstop2h 51m

Seattle/Tacoma Intl

dom. 1/18

8:25 am-1:06 pm

1 stop4h 41m

$128

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 1/10

3:30 pm-6:35 pm

Nonstop3h 05m

Seattle/Tacoma Intl

dom. 1/11

6:05 pm-10:38 pm

1 stop4h 33m

$130

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

vie. 2/27

3:40 pm-12:10 am

1 stop8h 30m

Seattle/Tacoma Intl

lun. 3/2

2:15 pm-10:20 pm

1 stop8h 05m

$131

OntarioNew York

ONT - LGA

ONTLGA

Ontario

mié. 1/7

6:30 am-4:10 pm

1 stop6h 40m

New York LaGuardia

dom. 1/11

9:50 am-5:35 pm

1 stop10h 45m

$157

OntarioHouston

ONT - HOU

ONTHOU

Ontario

mar. 2/3

3:09 pm-10:46 pm

1 stop5h 37m

Houston Hobby

mié. 2/11

6:00 am-10:08 am

1 stop6h 08m

$159

OntarioNew York

ONT - JFK

ONTJFK

Ontario

jue. 1/8

11:59 pm-11:30 am

1 stop8h 31m

New York John F Kennedy Intl

mié. 1/14

8:25 am-4:05 pm

1 stop10h 40m

$159

OntarioHouston

ONT - HOU

ONTHOU

Ontario

vie. 1/30

10:30 pm-10:21 am

1 stop9h 51m

Houston Hobby

mar. 2/3

5:45 am-11:31 am

1 stop7h 46m

$217

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 $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 $274 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

$87

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 $87. 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?

  • 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
8,158 reviews
Search Spirit Airlines flights
FrontierPriceFrom $35Free CancellationRating
5.8
3,092 reviews
Search Frontier flights
United AirlinesPriceFrom $59Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $67Free CancellationRating
8.0
11,400 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $97Free CancellationRating
8.0
4,252 reviews
Search Southwest flights
DeltaPriceFrom $178Free CancellationRating
7.9
8,009 reviews
Search Delta flights
JetBluePriceFrom $223Free CancellationRating
7.2
2,898 reviews
Search JetBlue flights
American AirlinesPriceFrom $242Free CancellationRating
7.2
11,044 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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sáb. 1/3
sáb. 1/10
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