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$110+ 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 27/1. 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
30 Jan — 6 Feb1
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 31 December 2025.

Cheapest one-way flight

$38

Cheapest round-trip flight

$111

Cheapest airline

Frontier

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,631 or less

Good one-way deal

$381 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 San Francisco.
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On average, Frontier currently has the cheapest one-way flight from Ontario (avg. price of $103).
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Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $688).
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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 31 December 2025.

Fri 23/120:48ONT - LAS
Nonstop1h 08mFrontier
Sun 25/108:10LAS - ONT
Nonstop1h 08mFrontier
Deal found 31/12$142
Wed 28/110:40ONT - LAS
Nonstop1h 05mSouthwest
Wed 4/209:00LAS - ONT
Nonstop1h 05mSouthwest
Deal found 29/12$204
Tue 27/106:05ONT - LAS
Nonstop1h 05mSouthwest
Tue 27/112:45LAS - ONT
Nonstop1h 05mSouthwest
Deal found 29/12$230
Tue 27/106:00ONT - LAS
1 stop4h 00mUnited Airlines
Tue 27/118:24LAS - ONT
1 stop4h 29mUnited Airlines
Deal found 29/12$234
Mon 26/121:00ONT - LAS
Nonstop1h 05mSouthwest
Mon 2/219:45LAS - ONT
Nonstop1h 00mSouthwest
Deal found 29/12$255
Sat 7/307:00ONT - PDX
Nonstop2h 28mAlaska Airlines
Sat 14/315:52PDX - ONT
1 stop7h 40mAlaska Airlines
Deal found 31/12$257
Mon 9/215:35ONT - PDX
1 stop7h 10mSouthwest
Wed 11/209:55PDX - ONT
1 stop5h 00mSouthwest
Deal found 30/12$260
Tue 10/213:53ONT - LAS
1 stop6h 59mUnited Airlines
Thu 19/218:22LAS - ONT
1 stop4h 35mUnited Airlines
Deal found 29/12$260
Sat 14/207:00ONT - PDX
Nonstop2h 28mAlaska Airlines
Fri 20/221:30PDX - ONT
Nonstop2h 22mAlaska Airlines
Deal found 31/12$264
Sat 14/206:00ONT - PDX
1 stop6h 25mDelta
Mon 23/219:11PDX - ONT
1 stop4h 38mDelta
Deal found 31/12$272
Tue 3/217:10ONT - PDX
1 stop6h 45mDelta
Thu 5/209:20PDX - ONT
1 stop4h 36mDelta
Deal found 30/12$275
Tue 10/215:15ONT - LAS
Nonstop1h 05mSouthwest
Thu 19/209:15LAS - ONT
Nonstop1h 05mSouthwest
Deal found 30/12$275

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 31 December 2025. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 14/3

07:00-09:28

Nonstop2h 28m

Portland

Thu 19/3

06:00-18:13

1 stop12h 13m

$257

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 5/2

16:03-09:29

1 stop17h 26m

Portland

Sat 7/2

14:43-17:03

Nonstop2h 20m

$257

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 21/1

11:53-20:47

1 stop8h 54m

Portland

Sat 24/1

14:43-17:03

Nonstop2h 20m

$257

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 28/1

17:59-20:26

Nonstop2h 27m

Portland

Wed 4/2

09:10-20:36

1 stop11h 26m

$257

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 6/2

16:03-20:47

1 stop4h 44m

Portland

Sat 7/2

14:43-17:03

Nonstop2h 20m

$257

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 18/2

06:14-22:41

1 stop16h 27m

Portland

Wed 4/3

21:30-23:52

Nonstop2h 22m

$257

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 9/2

15:35-22:45

1 stop7h 10m

Portland

Wed 11/2

09:55-14:55

1 stop5h 00m

$260

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 17/3

11:59-19:03

1 stop7h 04m

Portland

Tue 24/3

17:02-23:50

1 stop6h 48m

$264

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 4/2

15:30-20:59

1 stop5h 29m

Portland

Sat 7/2

17:08-21:48

1 stop4h 40m

$264

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 22/4

07:00-09:24

Nonstop2h 24m

Portland

Sat 25/4

21:30-23:48

Nonstop2h 18m

$264

Flights are sorted by cheapest return flights first.

Deals found on 29/12

Showing 1-10 of 60 results
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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 $698). Flying from Ontario in December will prove the most costly (average of $1,200). 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 (118 flights per day), Seattle (112 flights per day) and Atlanta (100 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $340
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,609

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 $340. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $340
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,609

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 31 December 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 $340 to Atlanta (prices may vary depending on the airline and departure time). On average, users have booked flights for $1,009 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 $1,839 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 $1,440 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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