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$85+ 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 26/5. 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
7 May — 14 May1
1 adult
1 adult, Economy, 0 bags

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 7 April 2026. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 26/5

15:45-20:30

1 stop4h 45m

Las Vegas Harry Reid Intl

Thu 28/5

16:50-21:15

1 stop4h 25m

$241

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 4/6

21:40-22:45

Nonstop1h 05m

Las Vegas Harry Reid Intl

Sat 6/6

12:30-21:55

2 stops9h 25m

$277

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 25/4

09:25-15:40

2 stops6h 15m

Las Vegas Harry Reid Intl

Mon 27/4

07:35-10:55

1 stop3h 20m

$291

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 7/5

08:10-12:05

1 stop3h 55m

Las Vegas Harry Reid Intl

Sat 9/5

06:00-15:35

2 stops9h 35m

$291

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 3/6

13:35-19:24

1 stop5h 49m

Portland

Tue 9/6

17:24-23:45

1 stop6h 21m

$298

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 20/5

06:40-10:15

1 stop3h 35m

Las Vegas Harry Reid Intl

Sat 23/5

06:00-15:35

2 stops9h 35m

$301

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 21/5

17:05-18:15

Nonstop1h 10m

Las Vegas Harry Reid Intl

Sun 24/5

07:40-12:20

1 stop4h 40m

$323

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 9/5

05:30-12:55

2 stops7h 25m

Portland

Thu 14/5

06:00-12:10

1 stop6h 10m

$334

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 27/5

16:03-21:28

1 stop5h 25m

Portland

Sun 31/5

05:00-11:10

1 stop6h 10m

$341

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 5/6

18:30-23:20

1 stop4h 50m

Portland

Thu 11/6

05:30-10:30

1 stop5h 00m

$350

Flights are sorted by cheapest return flights first.

Deals found on 6/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $891). Flying from Ontario in December will prove the most costly (average of $1,145). 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 Seattle (105 flights per day), Atlanta (67 flights per day) and San Francisco (65 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $329
Las Vegas Harry Reid Intl
Las Vegas Harry Reid Intl
From $226
Oakland
Oakland
From $574

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Las Vegas Harry Reid Intl, with prices starting at $226. Explore other affordable destinations below.

Las Vegas Harry Reid Intl
Las Vegas Harry Reid Intl
From $226
Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $329
Oakland
Oakland
From $574

Browse thousands of different options on Cheapflights for your next trip

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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 7 April 2026.

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

    For the current month, the most popular flights from Ontario are Las Vegas, Dallas/Fort Worth Airport, Denver. Las Vegas, Dallas/Fort Worth Airport, Denver 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 $226 to Las Vegas (prices may vary depending on the airline and departure time). On average, users have booked flights for $393 to fly from Ontario.

  • 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 $1,594 round trip
    Fly from Ontario to Melbourne from $1,838 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!

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