Cheap flights from Ontario (ONT) to USA

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How to find the cheapest flight from
Ontario (ONT) to USA

How far in advance should I book a flight from Ontario to USA?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 24 days in advance, which can save you up to 18% on flights from Ontario to USA compared to booking the week you need them. Waiting 24 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $262. For sooner than that we have options available in the next 3 days from $304.

What is the cheapest month to fly from Ontario to USA?

Our data shows that August tends to be the cheapest month to fly to USA from Ontario. Users have commonly found prices around $260 for the month, but tickets can be as low as $64. Due to multiple factors, prepare for potentially higher prices in December.

Cheap flights from Ontario to USA in March, April 2021

18 Mar - 19 Mar
$27pp
ONT
Ontario
Frontier
Non-Stop
PHX
Phoenix Sky Harbor Intl
PHX
Phoenix Sky Harbor Intl
Frontier
Non-Stop
ONT
Ontario
18 Mar - 22 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
PHX
Phoenix Sky Harbor Intl
PHX
Phoenix Sky Harbor Intl
Frontier
Non-Stop
ONT
Ontario
21 Mar - 22 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
LAS
Las Vegas McCarran
LAS
Las Vegas McCarran
Frontier
Non-Stop
ONT
Ontario

Ontario to USA 2021 flight deals

18 Mar - 19 Mar
$27pp
ONT
Ontario
Frontier
Non-Stop
PHX
Phoenix Sky Harbor Intl
PHX
Phoenix Sky Harbor Intl
Frontier
Non-Stop
ONT
Ontario
11 Mar - 14 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
21 Mar - 22 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
LAS
Las Vegas McCarran
LAS
Las Vegas McCarran
Frontier
Non-Stop
ONT
Ontario

Non-stop flights to USA from Ontario

18 Mar - 19 Mar
$27pp
ONT
Ontario
Frontier
Non-Stop
PHX
Phoenix Sky Harbor Intl
PHX
Phoenix Sky Harbor Intl
Frontier
Non-Stop
ONT
Ontario
18 Mar - 22 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
PHX
Phoenix Sky Harbor Intl
PHX
Phoenix Sky Harbor Intl
Frontier
Non-Stop
ONT
Ontario
11 Mar - 14 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

Last minute flights from Ontario to USA

11 Mar - 14 Mar
$32pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario
11 Mar - 15 Mar
$37pp
ONT
Ontario
Frontier
Non-Stop
PHX
Phoenix Sky Harbor Intl
PHX
Phoenix Sky Harbor Intl
Frontier
Non-Stop
ONT
Ontario
11 Mar - 18 Mar
$37pp
ONT
Ontario
Frontier
Non-Stop
SFO
San Francisco
SFO
San Francisco
Frontier
Non-Stop
ONT
Ontario

One-way flights to USA from Ontario

10:27 am - 12:42 pm
Frontier
Nonstop
1h 15m
ONT - PHX
Frontier
$16
FareScan
2:37 pm - 3:38 pm
Frontier
Nonstop
1h 01m
ONT - LAS
Frontier
9:05 am - 10:20 am
Frontier
Nonstop
1h 15m
ONT - PHX
Frontier
$24
Expedia

Related info for your journey

Flight FAQs

From Ontario to USA

Are flight prices decreasing from Ontario to USA due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Ontario and USA for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Ontario to United States to control the spread of COVID-19?

New policies can now be found on Delta and Alaska Airlines to help keep travelers safe while flying. Airline carriers are regularly disinfecting and sanitizing their aircraft. Masks are provided and are mandatory while on board. Pre-flight testing for symptoms and antibodies, alongside socially distanced seating (for a limited time) will work towards keeping travelers safer while flying from Ontario to United States. Policies will vary by airline.

Which airlines flying from Ontario to United States have flexible cancellations due to COVID-19?

American Airlines, United Airlines, and Alaska Airlines are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Ontario to USA for under $100 on Cheapflights?

Yes, there are multiple flights from Ontario to USA for under $100. The cheapest flight booked recently is on Frontier for just $27, but on average you can expect to pay $44.

Are there nonstop flights from Ontario to USA for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from Ontario to USA under $100. A good price for a nonstop flight from Ontario to USA is less than $46.

Are there last-minute flights available from Ontario to USA for under $100?

There are currently 20+ open flights from Ontario to USA within the next 7 days for less than $100.

What days are nonstop flights available from Ontario to USA?

You can find nonstop flights on the following days: Sunday, Tuesday, Wednesday, Thursday, Saturday.

How popular is this flight route?

Within the past month, 3,129 users have taken a look at flights from Ontario to United States.

What are the most popular routes from Ontario to USA?

Most travelers choose Ontario - Las Vegas McCarran, Ontario - Dallas/Fort Worth or Ontario - Seattle/Tacoma Intl when deciding on the best route from Ontario to USA.

What are the cheapest Flights from Ontario to USA?

While on average a flight from Ontario to USA is generally $1,988, our data shows the cheapest flight currently is $171. When looking at the most popular route, (Ontario - Las Vegas McCarran), you can expect to pay $51 for that flight.

How long is the flight from Ontario to USA?

Airlines like Frontier fly from Ontario to USA in about 1h 01m. The time it takes to get you to your destination is usually consistent. All flights are typically nonstop.

What is the cheapest airline to fly from Ontario to USA round-trip?

According to our current data, Frontier ($27), offers the cheapest pricing from Ontario to USA.

What are the cheapest airlines to fly from Ontario to USA one-way?

$16 is the cheapest one-way deal found within the past few days, from Frontier.

Destination points for flights from Ontario to USA

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Destination information for USA

Flight duration
1h 42m

Airports servicing Ontario

Top 10 airlines flying from Ontario to USA

Airline Cheapest Average Flexibility On-time COVID-19 safety
Spirit Airlines
$62 $195 No cancel fee 65%
Frontier
$28 $217 No cancel fee 62%
Southwest
$154 $261 No cancel fee 63%
Delta
$52 $262 No cancel fee N/A
United Airlines
$48 $288 No cancel fee 69%
Alaska Airlines
$43 $291 No cancel fee 75%
JetBlue
$49 $293 No cancel fee 62%
JSX
$208 $313 No cancel fee N/A

We couldn't confirm the COVID-19 safety measures taken by JSX. Please check directly on their website for additional information.

American Airlines
$71 $361 No cancel fee 71%
Linear Air Taxi
$782 $4,463 No cancel fee N/A

We couldn't confirm the COVID-19 safety measures taken by Linear Air Taxi. Please check directly on their website for additional information.

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