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$46+ 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 24/1. 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
12 Dec — 19 Dec1
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 12 November 2025.

Cheapest one-way flight

$29

Cheapest round-trip flight

$347

Cheapest airline

Alaska Airlines

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,675 or less

Good one-way deal

$392 or less
The cheapest one-way flight from Ontario is currently to Las Vegas Harry Reid Intl.
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The cheapest round-trip flight from Ontario is currently to Newark.
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On average, Alaska Airlines currently has the cheapest one-way flight from Ontario (avg. price of $192).
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Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $865).
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Price to beat on a round-trip flight from Ontario.
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Price to beat on a one-way flight from Ontario.
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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 12 November 2025.

Sat 7/208:30ONT - LAS
Nonstop1h 06mFrontier
Thu 12/220:13LAS - ONT
Nonstop1h 04mFrontier
Deal found 11/11$112
Sat 17/111:31ONT - LAS
Nonstop1h 13mFrontier
Wed 21/120:13LAS - ONT
Nonstop1h 04mFrontier
Deal found 10/11$136
Thu 12/206:30ONT - LAS
Nonstop1h 07mFrontier
Fri 20/215:56LAS - ONT
Nonstop1h 06mFrontier
Deal found 12/11$158
Tue 9/1206:50ONT - LAS
Nonstop1h 05mSouthwest
Tue 16/1211:10LAS - ONT
Nonstop1h 00mSouthwest
Deal found 11/11$179
Wed 3/1208:40ONT - LAS
Nonstop1h 05mSouthwest
Wed 3/1215:25LAS - ONT
1 stop4h 35mSouthwest
Deal found 10/11$195
Tue 9/1206:40ONT - LAS
2 stops5h 30mSouthwest
Wed 10/1217:10LAS - ONT
Nonstop1h 05mSouthwest
Deal found 11/11$202
Tue 6/112:10ONT - LAS
1 stop5h 30mSouthwest
Tue 13/110:15LAS - ONT
1 stop6h 10mSouthwest
Deal found 11/11$210
Thu 8/111:00ONT - LGA
1 stop7h 30mSouthwest
Sun 11/109:50LGA - ONT
1 stop10h 45mSouthwest
Deal found 12/11$296
Thu 5/206:30ONT - LGA
1 stop6h 25mSouthwest
Tue 10/214:00LGA - ONT
2 stops10h 05mSouthwest
Deal found 11/11$303
Tue 9/1209:55ONT - LGA
2 stops9h 00mSouthwest
Tue 20/114:30LGA - ONT
2 stops10h 15mSouthwest
Deal found 9/11$311
Sun 18/108:55ONT - LGA
1 stop10h 45mSouthwest
Wed 28/114:30LGA - ONT
2 stops10h 15mSouthwest
Deal found 12/11$313
Thu 8/105:05ONT - LGA
1 stop7h 41mUnited Airlines
Sat 10/110:34LGA - ONT
2 stops13h 24mUnited Airlines
Deal found 12/11$342

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 12 November 2025. 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

Sat 14/2

18:25-22:05

1 stop3h 40m

Las Vegas Harry Reid Intl

Wed 18/2

11:00-14:40

1 stop3h 40m

$251

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 30/1

16:40-22:00

1 stop5h 20m

Las Vegas Harry Reid Intl

Sun 1/2

09:15-10:20

Nonstop1h 05m

$282

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 14/4

12:30-16:25

1 stop3h 55m

Las Vegas Harry Reid Intl

Fri 17/4

05:40-10:25

1 stop4h 45m

$297

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Sun 18/1

08:55-22:40

1 stop10h 45m

New York LaGuardia

Wed 28/1

14:00-21:45

1 stop10h 45m

$303

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Wed 4/2

08:55-21:00

2 stops9h 05m

New York LaGuardia

Mon 9/2

14:00-20:05

1 stop9h 05m

$303

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 3/2

07:00-12:25

2 stops5h 25m

Las Vegas Harry Reid Intl

Tue 10/2

17:10-21:05

1 stop3h 55m

$305

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 22/3

05:15-09:10

1 stop3h 55m

Las Vegas Harry Reid Intl

Wed 25/3

21:35-22:35

Nonstop1h 00m

$313

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 9/12

06:40-12:10

2 stops5h 30m

Las Vegas Harry Reid Intl

Wed 10/12

13:20-19:30

2 stops6h 10m

$331

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 21/1

07:00-12:25

2 stops5h 25m

Las Vegas Harry Reid Intl

Fri 23/1

15:00-20:20

2 stops5h 20m

$357

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 12/12

18:10-19:15

Nonstop1h 05m

Las Vegas Harry Reid Intl

Sun 14/12

22:15-23:15

Nonstop1h 00m

$360

Flights are sorted by cheapest return flights first.

Deals found on 11/11

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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, January is the cheapest month in which you can book a flight from Ontario (average of $729). Flying from Ontario in December will prove the most costly (average of $1,294). 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 (106 flights per day), Seattle (102 flights per day) and Atlanta (73 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $350
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,653

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 $350. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $350
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,653

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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 12 November 2025.

  • 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 $350 to Atlanta (prices may vary depending on the airline and departure time). On average, users have booked flights for $1,037 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 $1,889 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is January. 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 $1,488 round trip
    Fly from Ontario to Melbourne from $1,829 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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