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£59+ 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 14/5. 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 — LHR
10 May — 17 May1
1 adult
1 adult, Economy, 0 bags

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 April 2026. In the last 7 days, Cheapflights users made a total of 858,174 searches

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 5/5

15:45-22:45

1 stop6h 00m

Denver Intl

Tue 12/5

06:45-11:35

2 stops5h 50m

£121

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 8/6

14:00-21:00

1 stop6h 00m

Denver Intl

Wed 10/6

11:55-17:05

2 stops6h 10m

£128

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 4/5

05:15-10:50

1 stop4h 35m

Denver Intl

Mon 11/5

11:05-16:25

2 stops6h 20m

£136
Fastest return journey

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 12/5

09:50-14:58

1 stop4h 08m

Denver Intl

Thu 14/5

05:30-08:53

1 stop4h 23m

£147

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 1/6

16:57-22:40

1 stop4h 43m

Denver Intl

Wed 3/6

18:19-23:34

1 stop6h 15m

£162

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 27/5

16:30-23:20

1 stop5h 50m

Denver Intl

Sat 30/5

14:45-20:45

2 stops7h 00m

£198

OntarioVancouver

ONT - YVR

ONTYVR

Ontario

Fri 24/4

14:20-23:01

1 stop8h 41m

Vancouver Intl

Mon 27/4

06:15-11:13

1 stop4h 58m

£201

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 6/5

18:59-00:59

1 stop5h 00m

Denver Intl

Wed 13/5

05:20-09:41

1 stop5h 21m

£215

OntarioVancouver

ONT - YVR

ONTYVR

Ontario

Thu 23/4

14:20-23:01

1 stop8h 41m

Vancouver Intl

Mon 27/4

07:23-13:39

1 stop6h 16m

£222

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Fri 29/5

13:55-20:30

1 stop5h 35m

Denver Intl

Mon 1/6

11:05-16:25

2 stops6h 20m

£224

Flights are sorted by cheapest return flights first.

Deals found on 6/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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, December is the cheapest month in which you can book a flight from Ontario (average of £350). Flying from Ontario in June will prove the most costly (average of £521). 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?

If you’re flying from Ontario, these routes are more frequently taken by airlines Seattle (100 flights per day), Dallas (83 flights per day) and Atlanta (66 flights per day).

Portland
Portland
From £64
Dallas/Fort Worth
Dallas/Fort Worth
From £222
Honolulu
Honolulu
From £145
Charlotte Douglas
Charlotte Douglas
From £126

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Portland, with prices starting at £64. Explore other affordable destinations below.

Portland
Portland
From £64
Charlotte Douglas
Charlotte Douglas
From £126
Honolulu
Honolulu
From £145
Dallas/Fort Worth
Dallas/Fort Worth
From £222

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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 April 2026.

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

    This month, the top selected destinations from Ontario are Las Vegas, Dallas/Fort Worth Airport, Denver. Throughout the year, Las Vegas, Dallas/Fort Worth Airport, Denver are some of the top choices made by users flying from Ontario.

  • What is the cheapest flight from Ontario to anywhere?

    Users have flown out of Ontario for as low as £64 to Portland (prices may vary depending on the airline and departure time). On average, users have booked flights for £259 to fly from Ontario.

  • What is the cheapest month to fly from Ontario?

    At the present moment the cheapest month to fly from Ontario is currently December; with June being the most expensive. Prices will vary depending on multiple factors such as booking in advance, airline and departure airports and times.

  • Where are the cheapest places to fly to from Ontario?

    Check out the cheapest flights from Ontario to embark to:
    Travel from Ontario to London from £674 round trip

  • How does Cheapflights help users find flights from Ontario?

    Deals for flights from Ontario are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

  • 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?

    Yes! Cheapflights helps users easily find flights from Ontario with no change fees.

  • 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?

Deals for flights from Ontario are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

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?

Yes! Cheapflights helps users easily find flights from Ontario with no change fees.

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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