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$104+ 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 6/1. 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
10 Jan — 17 Jan1
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 11 December 2025.

Cheapest one-way flight

$41

Cheapest round-trip flight

$83

Cheapest airline

Alaska Airlines

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,644 or less

Good one-way deal

$384 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 Las Vegas Harry Reid Intl.
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On average, Alaska Airlines currently has the cheapest one-way flight from Ontario (avg. price of $186).
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Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $664).
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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 11 December 2025.

Tue 6/116:40ONT - PDX
1 stop3h 50mSouthwest
Fri 9/106:45PDX - ONT
1 stop3h 40mSouthwest
Deal found 9/12$244
Tue 6/115:25ONT - PDX
2 stops7h 05mSouthwest
Wed 14/105:05PDX - ONT
2 stops7h 20mSouthwest
Deal found 9/12$251
Tue 13/107:00ONT - PDX
Nonstop2h 33mAlaska Airlines
Tue 20/114:43PDX - ONT
Nonstop2h 20mAlaska Airlines
Deal found 9/12$257
Wed 18/207:00ONT - PDX
Nonstop2h 28mAlaska Airlines
Sat 21/206:00PDX - ONT
1 stop17h 32mAlaska Airlines
Deal found 8/12$259
Tue 6/117:35ONT - PDX
1 stop3h 45mSouthwest
Thu 15/117:50PDX - ONT
1 stop4h 20mSouthwest
Deal found 10/12$262
Wed 25/216:02ONT - PDX
1 stop6h 39mAlaska Airlines
Mon 2/314:45PDX - ONT
1 stop4h 12mAlaska Airlines
Deal found 9/12$265
Thu 8/117:59ONT - PDX
Nonstop2h 27mAlaska Airlines
Sun 11/110:46PDX - ONT
Nonstop2h 20mAlaska Airlines
Deal found 9/12$266
Sat 10/106:00ONT - PDX
2 stops28h 07mDelta
Wed 14/117:15PDX - ONT
1 stop5h 36mDelta
Deal found 9/12$274
Sun 11/117:07ONT - PDX
1 stop5h 47mDelta
Wed 14/107:10PDX - ONT
1 stop6h 46mDelta
Deal found 9/12$275
Thu 22/117:10ONT - PDX
1 stop6h 45mDelta
Sun 25/107:10PDX - ONT
1 stop6h 46mDelta
Deal found 8/12$281
Thu 15/107:30ONT - PDX
1 stop13h 29mDelta
Sun 18/105:30PDX - ONT
1 stop8h 26mDelta
Deal found 9/12$283
Thu 25/1206:45ONT - DCA
1 stop12h 14mFrontier
Thu 1/108:00DCA - ONT
1 stop18h 59mFrontier
Deal found 9/12$405

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 11 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

Tue 10/2

11:53-17:59

1 stop6h 06m

Portland

Wed 11/2

10:46-13:06

Nonstop2h 20m

$251

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 6/1

17:07-22:54

1 stop5h 47m

Portland

Thu 8/1

17:15-22:51

1 stop5h 36m

$251

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 10/1

05:30-11:40

1 stop6h 10m

Portland

Sun 11/1

07:10-12:15

1 stop5h 05m

$266

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 20/2

07:00-09:28

Nonstop2h 28m

Portland

Sun 22/2

21:30-23:52

Nonstop2h 22m

$266

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 6/3

18:08-20:33

Nonstop2h 25m

Portland

Sun 8/3

21:30-23:52

Nonstop2h 22m

$266

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 13/3

18:08-20:33

Nonstop2h 25m

Portland

Sun 15/3

14:50-17:14

Nonstop2h 24m

$266

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 10/1

06:00-08:33

2 stops26h 33m

Portland

Sat 17/1

09:20-13:56

1 stop4h 36m

$274

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 10/1

15:30-20:59

1 stop5h 29m

Portland

Fri 16/1

17:15-12:16

2 stops19h 01m

$274

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 8/1

16:03-20:47

1 stop4h 44m

Portland

Sun 11/1

17:50-20:10

Nonstop2h 20m

$274

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 15/1

06:00-12:38

1 stop6h 38m

Portland

Sun 18/1

17:50-20:10

Nonstop2h 20m

$274

Flights are sorted by cheapest return flights first.

Deals found on 10/12

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 $702). Flying from Ontario in December will prove the most costly (average of $1,205). 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 (104 flights per day), Atlanta (74 flights per day) and Seattle (71 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $343
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,622

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 $343. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $343
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,622

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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 11 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 $343 to Atlanta (prices may vary depending on the airline and departure time). On average, users have booked flights for $1,018 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 $1,854 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 $1,426 round trip
    Fly from Ontario to Melbourne from $1,657 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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