Find flights
Deals

$49+ Cheap flights from Ontario

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — SYD
17 Mar — 24 Mar1
1 adult
1 adult, Economy, 0 bags

What to know about flights from Ontario

Discover essential information about flights departing from Ontario, including flight schedules, destinations, airlines operating at the Ontario airport, and any specific guidelines or requirements for travellers. Please note that the information is based on the most recent updates available. Data last updated 15 February 2026.

Cheapest one-way flight

$38

Cheapest round-trip flight

$78

Cheapest airline

Alaska Airlines

Most popular destination

Las Vegas Harry Reid Intl (LAS)

Good round-trip deal

$1,544 or less

Good one-way deal

$361 or less
The cheapest one-way flight from Ontario is currently to Las Vegas Harry Reid Intl.
Search Deals
The cheapest round-trip flight from Ontario is currently to Las Vegas Harry Reid Intl.
Search Deals
On average, Alaska Airlines currently has the cheapest one-way flight from Ontario (avg. price of $175).
Search Deals
Las Vegas Harry Reid Intl (LAS) is currently the most popular flight destination from Ontario (average return price of $119).
Search Deals
Price to beat on a round-trip flight from Ontario.
Search Deals
Price to beat on a one-way flight from Ontario.
Search Deals

Find flights from Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Ontario
Explore the most affordable flight options available from Ontario. Find the lowest fares based on data from user searches, with prices last updated on 15 February 2026.

Sun 5/422:35
ONT
-
LAS
Nonstop1h 11m
Frontier
Fri 1/518:59
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 14/2$181
Wed 25/310:35
ONT
-
LAS
Nonstop1h 05m
Southwest
Wed 1/421:35
LAS
-
ONT
Nonstop1h 00m
Southwest
Deal found 13/2$194
Fri 13/315:30
ONT
-
LAS
Nonstop1h 10m
Frontier
Fri 20/307:00
LAS
-
ONT
Nonstop1h 06m
Frontier
Deal found 11/2$202
Tue 17/318:37
ONT
-
LAS
1 stop3h 56m
United Airlines
Wed 18/307:30
LAS
-
ONT
1 stop4h 48m
United Airlines
Deal found 12/2$222
Wed 11/306:45
ONT
-
LAS
1 stop4h 15m
Southwest
Wed 11/312:35
LAS
-
ONT
2 stops5h 45m
Southwest
Deal found 12/2$229
Sat 28/316:35
ONT
-
LAS
1 stop6h 15m
Southwest
Wed 1/406:50
LAS
-
ONT
Nonstop1h 00m
Southwest
Deal found 13/2$232
Thu 12/321:55
ONT
-
LAS
Nonstop1h 05m
Southwest
Thu 19/322:35
LAS
-
ONT
Nonstop1h 00m
Southwest
Deal found 12/2$242
Mon 16/316:00
ONT
-
LAS
1 stop3h 50m
Southwest
Tue 17/305:30
LAS
-
ONT
1 stop4h 10m
Southwest
Deal found 14/2$246
Mon 9/316:20
ONT
-
LAS
1 stop5h 15m
Southwest
Wed 11/312:35
LAS
-
ONT
2 stops5h 45m
Southwest
Deal found 12/2$253
Thu 12/316:25
ONT
-
LAS
Nonstop1h 10m
Southwest
Sat 14/305:35
LAS
-
ONT
1 stop3h 30m
Southwest
Deal found 14/2$256
Mon 9/305:25
ONT
-
LAS
Nonstop1h 05m
Southwest
Mon 9/309:20
LAS
-
ONT
Nonstop1h 05m
Southwest
Deal found 14/2$263
Tue 19/523:25
ONT
-
JFK
Nonstop5h 25m
JetBlue
Sat 23/518:59
JFK
-
ONT
Nonstop6h 10m
JetBlue
Deal found 13/2$326

Find flights from Ontario within your budget

 
Find flights departing from Ontario that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 15 February 2026. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 7/4

16:30-17:35

Nonstop1h 05m

Las Vegas Harry Reid Intl

Tue 7/4

21:10-22:10

Nonstop1h 00m

$194

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 17/3

18:37-00:58

1 stop6h 21m

Las Vegas Harry Reid Intl

Wed 18/3

11:08-17:41

1 stop6h 33m

$222

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 17/3

16:25-21:05

1 stop4h 40m

Las Vegas Harry Reid Intl

Wed 18/3

18:35-23:10

1 stop4h 35m

$222

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 16/3

16:00-19:50

1 stop3h 50m

Las Vegas Harry Reid Intl

Tue 17/3

05:30-09:40

1 stop4h 10m

$246

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 28/3

16:35-22:50

1 stop6h 15m

Las Vegas Harry Reid Intl

Sat 4/4

05:20-10:05

1 stop4h 45m

$270

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 31/3

06:45-12:25

2 stops5h 40m

Las Vegas Harry Reid Intl

Wed 1/4

06:05-12:00

1 stop5h 55m

$295

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 25/3

06:55-12:20

2 stops5h 25m

Las Vegas Harry Reid Intl

Wed 1/4

08:10-12:00

1 stop3h 50m

$295

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 31/3

05:10-12:59

1 stop7h 49m

Las Vegas Harry Reid Intl

Wed 1/4

06:00-12:14

1 stop6h 14m

$307

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 4/4

10:25-17:35

2 stops7h 10m

Las Vegas Harry Reid Intl

Tue 7/4

07:25-13:00

1 stop5h 35m

$308

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sat 28/2

22:20-09:22

1 stop8h 02m

Baltimore/Washington

Wed 4/3

07:05-12:07

1 stop8h 02m

$363

Flights are sorted by cheapest return flights first.

Deals found on 12/2

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario

Have a flexible travel schedule? Discover the best time to fly from Ontario with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Ontario

Get recent, data-driven insights about flights from Ontario including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Ontario?

Currently, August is the cheapest month in which you can book a flight from Ontario (average of $941). Flying from Ontario in December will prove the most costly (average of $1,123). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

What are popular destinations to fly to from Ontario?

Ontario offers frequent flights to Dallas (103 flights per day), Seattle (88 flights per day) and Phoenix (76 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $322
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,524

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Atlanta Hartsfield-Jackson, with prices starting at $322. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $322
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,524

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Related info for your journey

Access useful and relevant information related to your journey from Ontario. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 15 February 2026.

  • What are the most popular destinations to fly to from Ontario?

    For the current month, the most popular flights from Ontario are Dallas/Fort Worth Airport, Denver, Guadalajara. Dallas/Fort Worth Airport, Denver, Guadalajara are the most popular locations from Ontario year round.

  • What is the cheapest flight from Ontario to anywhere?

    Users have flown out of Ontario for as low as $322 to Atlanta (prices may vary depending on the airline and departure time). On average, users have booked flights for $956 to fly from Ontario.

  • What is the cheapest first class flight from Ontario?

    If you’re looking to fly first-class from Ontario to anywhere, put Denver on your list as prices start at $1,742 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is August. The most expensive month for flights is December. The cheapest prices are shown above but prices will vary according to departure times, airlines, class and how early you book.

  • Where are the cheapest places to fly to from Ontario?

    View the cheapest flight destinations from Ontario:
    Fly from Ontario to Sydney from $1,424 round trip

  • How does Cheapflights help users find flights from Ontario?

    Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

  • Why should you use Cheapflights to find cheap flight tickets from Ontario?

    It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario.

  • Can Cheapflights find flights from Ontario with no change fees?

    Certainly. Search results for flights from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

  • Can Cheapflights notify me if prices for flights from Ontario become cheaper?

    Yes, Cheapflights has a feature called Price Alerts, which offers users the ability to be notified when flight prices change. Track prices for your flight from Ontario today and book when you’re ready!

See more FAQs

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Ontario?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario.

Can Cheapflights find flights from Ontario with no change fees?

Certainly. Search results for flights from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alerts, which offers users the ability to be notified when flight prices change. Track prices for your flight from Ontario today and book when you’re ready!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.