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$136+ 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 19/9. 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
15 Jul — 22 Jul1
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 10 July 2025.

Cheapest one-way flight

$46

Cheapest round-trip flight

$74

Cheapest airline

Alaska Airlines

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,673 or less

Good one-way deal

$676 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 $207).
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Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $1,546).
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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

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 10 July 2025.

Thu 24/717:14ONT - LAS
Nonstop1h 14mFrontier
Sat 26/715:09LAS - ONT
Nonstop1h 11mFrontier
Deal found 9/7$147
Fri 8/820:30ONT - LAS
Nonstop1h 05mSouthwest
Tue 12/819:40LAS - ONT
Nonstop1h 05mSouthwest
Deal found 9/7$161
Tue 14/1012:00ONT - CLE
1 stop7h 25mSouthwest
Tue 21/1006:35CLE - ONT
2 stops10h 10mSouthwest
Deal found 9/7$311
Fri 12/907:00ONT - LGA
1 stop12h 30mSouthwest
Fri 19/914:10LGA - ONT
1 stop9h 40mSouthwest
Deal found 8/7$332
Mon 4/818:39ONT - CLE
1 stop7h 36mUnited Airlines
Sat 9/817:15CLE - ONT
1 stop7h 22mUnited Airlines
Deal found 8/7$360
Mon 4/816:00ONT - CLE
1 stop10h 11mHawaiian Airlines
Tue 5/807:00CLE - ONT
1 stop9h 26mHawaiian Airlines
Deal found 9/7$363
Wed 13/823:59ONT - JFK
Nonstop5h 31mJetBlue
Wed 20/818:50JFK - ONT
Nonstop6h 09mJetBlue
Deal found 8/7$393
Tue 5/806:00ONT - EWR
1 stop8h 01mUnited Airlines
Tue 12/806:30EWR - ONT
1 stop9h 02mUnited Airlines
Deal found 7/7$409
Mon 11/822:00ONT - LGA
1 stop7h 15mDelta
Tue 19/813:59LGA - ONT
1 stop8h 12mDelta
Deal found 8/7$422
Sat 9/807:05ONT - JFK
1 stop9h 30mDelta
Mon 18/813:30JFK - ONT
1 stop8h 41mDelta
Deal found 8/7$422
Tue 30/906:00ONT - EWR
1 stop8h 35mDelta
Tue 28/1006:00EWR - ONT
1 stop8h 24mDelta
Deal found 7/7$424
Sat 8/1105:40ONT - LGA
1 stop7h 09mUnited Airlines
Tue 11/1114:15LGA - ONT
2 stops11h 30mUnited Airlines
Deal found 9/7$427

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 10 July 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

Sun 14/9

20:35-23:45

1 stop3h 10m

Las Vegas Harry Reid Intl

Wed 17/9

07:35-12:00

1 stop4h 25m

$231

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 23/7

00:59-07:59

1 stop7h 00m

Las Vegas Harry Reid Intl

Sat 26/7

15:09-16:20

Nonstop1h 11m

$248

OntarioCleveland

ONT - CLE

ONTCLE

Ontario

Tue 14/10

12:00-22:25

1 stop7h 25m

Cleveland Hopkins Intl

Tue 21/10

06:35-13:45

2 stops10h 10m

$311

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Fri 12/9

07:00-22:30

1 stop12h 30m

New York LaGuardia

Fri 19/9

14:10-20:50

1 stop9h 40m

$332

OntarioCleveland

ONT - CLE

ONTCLE

Ontario

Mon 4/8

18:39-05:15

1 stop7h 36m

Cleveland Hopkins Intl

Sat 9/8

17:15-21:37

1 stop7h 22m

$360

OntarioCleveland

ONT - CLE

ONTCLE

Ontario

Mon 4/8

16:00-05:11

1 stop10h 11m

Cleveland Hopkins Intl

Tue 5/8

07:00-13:26

1 stop9h 26m

$363

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Wed 13/8

23:59-08:30

Nonstop5h 31m

New York John F Kennedy Intl

Wed 20/8

18:50-21:59

Nonstop6h 09m

$393

OntarioNewark

ONT - EWR

ONTEWR

Ontario

Tue 5/8

06:00-17:01

1 stop8h 01m

Newark

Tue 12/8

06:30-12:32

1 stop9h 02m

$409

OntarioNew York

ONT - LGA

ONTLGA

Ontario

Mon 11/8

22:00-08:15

1 stop7h 15m

New York LaGuardia

Tue 19/8

13:59-19:11

1 stop8h 12m

$422

OntarioNew York

ONT - JFK

ONTJFK

Ontario

Sat 9/8

07:05-19:35

1 stop9h 30m

New York John F Kennedy Intl

Mon 18/8

13:30-19:11

1 stop8h 41m

$422

Flights are sorted by cheapest return flights first.

Deals found on 9/7

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, April is the cheapest month in which you can book a flight from Ontario (average of $758). Flying from Ontario in December will prove the most costly (average of $1,347). 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 (151 flights per day), Dallas (121 flights per day) and Atlanta (92 flights per day).

Dallas/Fort Worth
Dallas/Fort Worth
From $126
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 Dallas/Fort Worth, with prices starting at $194. Explore other affordable destinations below.

Dallas/Fort Worth
Dallas/Fort Worth
From $126
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,079

Airline reviews for flights from Ontario

Get insights into the airlines that provide service from Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing airline for your flight from Ontario. In the last 7 days, Cheapflights users made a total of 647,157 searches.
Read reviews from past customers who have flown Alaska Airlines, Hawaiian Airlines, andUnited Airlines from Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very Good
10,000 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,561 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,846 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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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 10 July 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 $194 to Dallas/Fort Worth Airport (prices may vary depending on the airline and departure time). On average, users have booked flights for $1,209 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 $1,887 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 $1,526 round trip
    Fly from Ontario to Melbourne from $1,965 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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