Cheap flights from Ontario to the United States from $13

Round-trip
1 adult
Economy
0 bags
From?
To?
Tue 8/16
Tue 8/23

Deals available from 900+ travel sites.

Flight information for Ontario to United States

Find info about flight duration, direct flights, and airports for your flight from Ontario to United States

Fastest flight time

1h 22m

Direct flights

Mon, Tue, Sat and Sun
The fastest flight from Ontario to United States takes 1h 22m
Direct flights go from Ontario to United States on Monday, Tuesday, Saturday and Sunday. Airlines offering direct flights are: United Airlines and Air Canada.

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 airline that flies to United States from Ontario?

Juneyao Airlines

Allegiant Air, Breeze Airways, and Frontier are the most popular carriers operating from Ontario to United States

What is the cheapest Ontario to United States flight route?

Ontario - Las Vegas Harry Reid Intl

Fly from Ontario to Las Vegas Harry Reid Intl for the best Ontario - United States flight prices


Easily compare round-trip flights from Ontario to United States

Below you can see the best fares for your round-trip flight route over the next three months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Ontario to United States by changing tabs
Frontier
Aug 23
ONT9:09 amOntario
1h 19m
LAS10:28 amLas Vegas Harry Reid Intl
Aug 26
LAS2:03 amLas Vegas Harry Reid Intl
1h 05m
ONT3:08 amOntario
Multiple Airlines
Sep 12
ONT3:47 pmOntario
11h 10m
1 stop
LAS2:57 amLas Vegas Harry Reid Intl
Sep 14
LAS10:52 amLas Vegas Harry Reid Intl
1h 13m
ONT12:05 pmOntario
Frontier
Aug 27
ONT2:43 pmOntario
1h 12m
LAS3:55 pmLas Vegas Harry Reid Intl
Aug 31
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario
Frontier
Sep 13
ONT3:47 pmOntario
1h 23m
SFO5:10 pmSan Francisco
Sep 20
SFO1:08 pmSan Francisco
1h 29m
ONT2:37 pmOntario
Frontier
Sep 8
ONT3:47 pmOntario
1h 23m
SFO5:10 pmSan Francisco
Sep 10
SFO1:13 pmSan Francisco
1h 29m
ONT2:42 pmOntario
Frontier
Aug 22
ONT9:46 amOntario
1h 19m
LAS11:05 amLas Vegas Harry Reid Intl
Aug 24
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario

Find the cheapest one-way flights from Ontario to United States

If you're looking for one-way flights from Ontario to United States, view some of our deals below provided by Frontier
Frontier
Aug 20
ONT2:43 pmOntario
1h 12m
LAS3:55 pmLas Vegas Harry Reid Intl
Frontier
Sep 5
ONT9:46 amOntario
1h 19m
LAS11:05 amLas Vegas Harry Reid Intl
Frontier
Aug 16
ONT9:09 amOntario
1h 19m
LAS10:28 amLas Vegas Harry Reid Intl

Search last-minute flights to United States from Ontario

Find and compare round-trip flight prices for your last-minute flight from Ontario to United States
Frontier
Aug 20
ONT2:43 pmOntario
1h 12m
LAS3:55 pmLas Vegas Harry Reid Intl
Aug 24
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario
Frontier
Aug 16
ONT9:09 amOntario
1h 19m
LAS10:28 amLas Vegas Harry Reid Intl
Aug 20
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario
Frontier
Aug 20
ONT2:43 pmOntario
1h 12m
LAS3:55 pmLas Vegas Harry Reid Intl
Aug 24
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario
Multiple Airlines
Aug 20
ONT2:43 pmOntario
15h 43m
1 stop
DEN6:26 amDenver Intl
Aug 27
DEN5:36 amDenver Intl
2h 20m
ONT7:56 amOntario
Frontier
Aug 16
ONT9:09 amOntario
1h 19m
LAS10:28 amLas Vegas Harry Reid Intl
Aug 17
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario
Frontier
Aug 17
ONT2:28 pmOntario
1h 12m
LAS3:40 pmLas Vegas Harry Reid Intl
Aug 25
LAS11:18 amLas Vegas Harry Reid Intl
1h 06m
ONT12:24 pmOntario

Best airlines flying from Ontario to United States

Compare and see reviews for airlines that fly from Ontario to United States with momondo
AirlineRatingFree CancellationPrice
Juneyao AirlinesPriceFrom $10Free CancellationRating
0.0
Search Juneyao Airlines flights
FrontierPriceFrom $25Free CancellationRating
6.2
6.4

Boarding

5.8

Comfort

7.0

Crew

4.7

Entertainment

5.0

Food

Reviews

Was weather related delay for hours

1 / 10
Search Frontier flights
Spirit AirlinesPriceFrom $34Free CancellationRating
6.3
6.5

Boarding

5.9

Comfort

7.0

Crew

4.9

Entertainment

5.1

Food

Reviews

Nothing can be liked, flight delayed, moved around all of us, sat on runway for hours.

1 / 10
Search Spirit Airlines flights
Alaska AirlinesPriceFrom $38Free CancellationRating
8.1
8.3

Boarding

8.0

Comfort

8.6

Crew

7.2

Entertainment

7.1

Food

Reviews

The service was awful. The crew was rude and not helpful at all.

1 / 10
Search Alaska Airlines flights
JetBluePriceFrom $41Free CancellationRating
6.9
7.1

Boarding

7.4

Comfort

7.7

Crew

7.0

Entertainment

6.5

Food

Reviews

Boston-based flight crew was superb

1 / 10
Search JetBlue flights
TunisairPriceFrom $49Free CancellationRating
5.0
Search Tunisair flights
DeltaPriceFrom $71Free CancellationRating
7.8
7.9

Boarding

8.0

Comfort

8.3

Crew

7.7

Entertainment

7.3

Food

Reviews

Flying with Delta is always a relatively smooth experience.

1 / 10
Search Delta flights
Breeze AirwaysPriceFrom $78Free CancellationRating
9.1
9.7

Boarding

8.5

Comfort

10.0

Crew

5.7

Entertainment

7.4

Food

Reviews

Would travel Breeze again. Crew was polite and the plane was clean and on time.

1 / 5
Search Breeze Airways flights
Allegiant AirPriceFrom $82Free CancellationRating
6.9
7.2

Boarding

6.8

Comfort

8.0

Crew

5.4

Entertainment

6.0

Food

Reviews

Not this flight but the flight down to Tampa was horrible. The lack of prior needed communication was a 0/10! I think a six hour delay is ridiculous in my opinion and could be avoided.

1 / 10
Search Allegiant Air flights
United AirlinesPriceFrom $93Free CancellationRating
7.1
7.5

Boarding

7.0

Comfort

8.0

Crew

6.9

Entertainment

6.4

Food

Reviews

The flight was canceled….so…

1 / 10
Search United Airlines flights

Frontier flights from Ontario to United States

Our best Frontier deals on Ontario to United States flight tickets
Frontier
Aug 23
ONT9:09 amOntario
1h 19m
LAS10:28 amLas Vegas Harry Reid Intl
Aug 26
LAS2:03 amLas Vegas Harry Reid Intl
1h 05m
ONT3:08 amOntario
Frontier
Aug 27
ONT2:43 pmOntario
1h 12m
LAS3:55 pmLas Vegas Harry Reid Intl
Aug 31
LAS2:00 amLas Vegas Harry Reid Intl
1h 05m
ONT3:05 amOntario
Frontier
Sep 13
ONT3:47 pmOntario
1h 23m
SFO5:10 pmSan Francisco
Sep 20
SFO1:08 pmSan Francisco
1h 29m
ONT2:37 pmOntario

United Airlines flights from Ontario to United States

Our best United Airlines deals on Ontario to United States flight tickets
United Airlines
Sep 28
ONT2:00 amOntario
7h 07m
1 stop
SEA9:07 amSeattle/Tacoma Intl
Oct 4
SEA12:42 pmSeattle/Tacoma Intl
7h 33m
1 stop
ONT8:15 pmOntario
United Airlines
Sep 20
ONT6:59 amOntario
4h 11m
1 stop
PDX11:10 amPortland
Sep 28
PDX3:06 pmPortland
5h 03m
1 stop
ONT8:09 pmOntario
United Airlines
Aug 20
ONT2:00 amOntario
1h 22m
SFO3:22 amSan Francisco
Aug 27
SFO6:40 pmSan Francisco
1h 31m
ONT8:11 pmOntario

  • Are airlines flying from Ontario to United States offering flexible cancellation due to COVID-19?

    To ease the stress of booking flights, some of our airline partners flying from Ontario to United States are responding to the global pandemic. The following airlines may have a flexible cancellation policy to help accommodate travelers: Frontier, Alaska Airlines, and United Airlines.



Alternative routes for Ontario to United States

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Los Angeles to Seattle Flights
Fastest flight time2h 43m
Cheapest price$140
Los Angeles to New York Flights
Fastest flight time5h 01m
Cheapest price$135
Los Angeles to Chicago Flights
Fastest flight time3h 48m
Cheapest price$118
Ontario to Seattle Flights
Fastest flight time2h 35m
Cheapest price$141
Santa Ana to Seattle Flights
Fastest flight time2h 40m
Cheapest price$106
Los Angeles to Honolulu Flights
Fastest flight time5h 32m
Cheapest price$173
San Francisco to Seattle Flights
Fastest flight time1h 59m
Cheapest price$117
San Francisco to New York Flights
Fastest flight time5h 02m
Cheapest price$168
Los Angeles to Dallas Flights
Fastest flight time2h 59m
Cheapest price$89
Los Angeles to Boston Flights
Fastest flight time5h 22m
Cheapest price$184
Los Angeles to Las Vegas Flights
Fastest flight time1h 07m
Cheapest price$39
San Francisco to Honolulu Flights
Fastest flight time5h 14m
Cheapest price$173

Why use momondo?

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.

Yes. All flights to United States from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

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.

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.


Here's why travelers choose to use momondo
Flexible Travel
momondo understands the need for flexibility and we have a filter specifically for flights with no change fees.
Expert Insights
Data driven insights designed to help you find a great flight deal. From the cheapest time to depart to how far in advance to book.
Price Alerts
Track the price of your preferred flight route and be notified when it changes.