Find flights
Deals

$75+ 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 4/12. 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
3 Sep — 10 Sep1
1 adult

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 29 August 2025.

Cheapest one-way flight

$43

Cheapest round-trip flight

$81

Cheapest airline

Alaska Airlines

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,676 or less

Good one-way deal

$338 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 $206).
Search Deals
Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $937).
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

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 29 August 2025.

Thu 11/906:00ONT - LAS
Nonstop1h 11mFrontier
Tue 23/920:49LAS - ONT
Nonstop1h 07mFrontier
Deal found 29/8$90
Mon 17/1108:40ONT - LAS
Nonstop1h 05mSouthwest
Tue 18/1119:45LAS - ONT
Nonstop1h 00mSouthwest
Deal found 28/8$149
Sat 27/915:45ONT - LAS
1 stop6h 15mSouthwest
Mon 29/907:10LAS - ONT
Nonstop1h 05mSouthwest
Deal found 29/8$164
Sat 20/905:35ONT - LAS
2 stops7h 30mSouthwest
Mon 22/907:10LAS - ONT
Nonstop1h 05mSouthwest
Deal found 28/8$172
Sat 27/915:45ONT - LAS
1 stop6h 15mSouthwest
Sat 4/1010:00LAS - ONT
1 stop4h 35mSouthwest
Deal found 28/8$179
Wed 29/1007:00ONT - LAS
2 stops5h 20mSouthwest
Sat 1/1105:40LAS - ONT
2 stops7h 05mSouthwest
Deal found 27/8$195
Tue 6/121:00ONT - LAS
Nonstop1h 05mSouthwest
Wed 7/119:45LAS - ONT
Nonstop1h 00mSouthwest
Deal found 26/8$201
Thu 18/905:40ONT - LAS
Nonstop1h 05mSouthwest
Tue 23/907:35LAS - ONT
1 stop4h 25mSouthwest
Deal found 28/8$205
Thu 2/1007:50ONT - LAS
Nonstop1h 05mSouthwest
Thu 2/1016:40LAS - ONT
2 stops5h 15mSouthwest
Deal found 27/8$213
Mon 5/121:15ONT - LAS
Nonstop1h 00mSouthwest
Wed 7/112:45LAS - ONT
Nonstop1h 05mSouthwest
Deal found 26/8$216
Wed 8/1011:00ONT - LAS
1 stop3h 40mSouthwest
Fri 10/1022:00LAS - ONT
Nonstop1h 00mSouthwest
Deal found 28/8$221
Sat 11/1011:48ONT - PDX
1 stop7h 31mDelta
Wed 15/1017:25PDX - ONT
1 stop5h 16mDelta
Deal found 27/8$241

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 29 August 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

Thu 11/9

06:00-07:11

Nonstop1h 11m

Las Vegas Harry Reid Intl

Tue 23/9

20:49-21:56

Nonstop1h 07m

$90

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 17/11

08:40-09:45

Nonstop1h 05m

Las Vegas Harry Reid Intl

Tue 18/11

19:45-20:45

Nonstop1h 00m

$149

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 8/12

20:55-21:55

Nonstop1h 00m

Las Vegas Harry Reid Intl

Thu 11/12

05:30-09:15

1 stop3h 45m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 6/11

21:15-22:15

Nonstop1h 00m

Las Vegas Harry Reid Intl

Mon 10/11

17:20-22:05

1 stop4h 45m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 20/9

11:15-15:20

1 stop4h 05m

Las Vegas Harry Reid Intl

Mon 22/9

07:10-08:15

Nonstop1h 05m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 22/9

15:15-20:00

1 stop4h 45m

Las Vegas Harry Reid Intl

Tue 23/9

19:40-20:45

Nonstop1h 05m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 30/9

13:55-18:15

1 stop4h 20m

Las Vegas Harry Reid Intl

Tue 30/9

19:40-20:45

Nonstop1h 05m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 4/10

15:50-22:10

1 stop6h 20m

Las Vegas Harry Reid Intl

Mon 6/10

22:00-23:00

Nonstop1h 00m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 13/10

21:35-22:40

Nonstop1h 05m

Las Vegas Harry Reid Intl

Thu 16/10

08:25-12:05

1 stop3h 40m

$164

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 11/10

15:50-22:10

1 stop6h 20m

Las Vegas Harry Reid Intl

Mon 13/10

22:00-23:00

Nonstop1h 00m

$164

Flights are sorted by cheapest return flights first.

Deals found on 27/8

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, April is the cheapest month in which you can book a flight from Ontario (average of $743). Flying from Ontario in December will prove the most costly (average of $1,332). 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 (102 flights per day), Dallas (88 flights per day) and Salt Lake City (69 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $228
San Salvador El Salvador Intl
San Salvador El Salvador Intl
From $220
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,079

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is San Salvador El Salvador Intl, with prices starting at $337. Explore other affordable destinations below.

San Salvador El Salvador Intl
San Salvador El Salvador Intl
From $220
Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $228
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,079

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 29 August 2025.

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

    For the current month, the most popular flights from Ontario are Denver, Dallas/Fort Worth Airport, 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 $337 to San Salvador (prices may vary depending on the airline and departure time). On average, users have booked flights for $872 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 $1,890 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is April. 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 $1,609 round trip
    Fly from Ontario to Melbourne from $1,830 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.