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£46+ Cheap flights from Ontario

This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/3. 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
26 Feb — 5 Mar1
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 21 February 2025.

Cheapest one-way flight

£14

Cheapest round-trip flight

£28

Cheapest airline

Spirit Airlines

Most popular destination

London Heathrow (LHR)

Good one-way deal

£201 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, Spirit Airlines currently has the cheapest one-way flight from Ontario (avg. price of £36).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £366).
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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 21 February 2025.

Thu 24/405:35ONT - DEN
Nonstop2h 10mSouthwest
Mon 28/421:40DEN - ONT
Nonstop2h 20mSouthwest
Deal found 20/2£77
Thu 3/406:00ONT - DEN
1 stop6h 00mDelta
Tue 8/414:20DEN - ONT
1 stop9h 03mDelta
Deal found 21/2£166
Mon 17/307:00ONT - DEN
1 stop5h 54mAlaska Airlines
Tue 25/314:53DEN - ONT
1 stop10h 06mAlaska Airlines
Deal found 20/2£171
Wed 26/313:40ONT - DEN
Nonstop2h 20mUnited Airlines
Mon 31/319:19DEN - ONT
Nonstop2h 23mUnited Airlines
Deal found 20/2£204
Wed 26/310:57ONT - LHR
1 stop13h 23mIberia
Wed 9/416:25LHR - ONT
1 stop15h 25mIberia
Deal found 21/2£482
Wed 26/311:42ONT - LHR
1 stop16h 28mVirgin Atlantic
Wed 9/411:45LHR - ONT
2 stops20h 07mVirgin Atlantic
Deal found 21/2£492
Sun 23/310:57ONT - LHR
1 stop15h 43mMultiple Airlines
Wed 2/415:40LHR - ONT
1 stop14h 20mMultiple Airlines
Deal found 20/2£506
Thu 27/307:00ONT - LHR
1 stop16h 20mDelta
Thu 10/406:30LHR - ONT
2 stops18h 13mDelta
Deal found 19/2£508
Mon 10/313:30ONT - LHR
1 stop13h 30mKLM
Tue 18/312:30LHR - ONT
1 stop17h 13mKLM
Deal found 20/2£512
Wed 30/412:50ONT - GLA
2 stops18h 45mBritish Airways
Tue 6/510:55GLA - ONT
2 stops20h 49mBritish Airways
Deal found 21/2£517
Thu 13/306:00ONT - LHR
2 stops18h 10mUnited Airlines
Thu 27/315:00LHR - ONT
2 stops36h 57mUnited Airlines
Deal found 20/2£517
Sat 15/323:59ONT - LHR
2 stops33h 01mBritish Airways
Thu 10/416:25LHR - ONT
1 stop15h 25mBritish Airways
Deal found 20/2£530

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 21 February 2025. In the last 7 days, Cheapflights users made a total of 858,174 searches

Fly to

Heathrow

Route

Depart

Return

Price

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Fri 7/3

05:00-08:10

Nonstop2h 10m

Denver Intl

Mon 10/3

13:20-18:25

1 stop6h 05m

£180

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Fri 14/3

05:40-13:29

1 stop6h 49m

Denver Intl

Mon 17/3

18:10-23:56

1 stop6h 46m

£182

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 17/3

07:00-18:59

2 stops10h 59m

Denver Intl

Tue 25/3

14:53-23:59

1 stop10h 06m

£202

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 26/3

13:40-17:00

Nonstop2h 20m

Denver Intl

Mon 31/3

19:19-20:42

Nonstop2h 23m

£204

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 26/3

10:57-07:20

1 stop13h 23m

London Heathrow

Wed 9/4

16:25-23:50

1 stop15h 25m

£482

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 26/3

11:42-11:10

1 stop16h 28m

London Heathrow

Wed 9/4

11:45-23:52

2 stops20h 07m

£492

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 23/3

10:57-09:40

1 stop15h 43m

London Heathrow

Wed 2/4

15:40-22:00

1 stop14h 20m

£506

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 27/3

07:00-06:20

1 stop16h 20m

London Heathrow

Thu 10/4

06:30-16:43

2 stops18h 13m

£508

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/3

13:30-10:00

1 stop13h 30m

London Heathrow

Tue 18/3

12:30-22:43

1 stop17h 13m

£512

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Wed 30/4

12:50-15:35

2 stops18h 45m

Glasgow Intl

Tue 6/5

10:55-23:44

2 stops20h 49m

£517

Flights are sorted by cheapest return flights first.

Deals found on 21/2

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.

When is the best time to book a flight from Ontario?

Use this chart to determine the optimal time to book a return flight from Ontario to Heathrow. Price data was last updated on 14 February 2025.

Booking 42 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ontario?

Currently, August is the cheapest month in which you can book a flight from Ontario (average of £222). Flying from Ontario in June will prove the most costly (average of £640). 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 Dallas (96 flights per day), San Francisco (68 flights per day) and Seattle (60 flights per day).

Seattle/Tacoma Intl

Seattle/Tacoma Intl

From £249

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Seattle/Tacoma Intl, with prices starting at £198. Explore other affordable destinations below.

Seattle/Tacoma Intl

Seattle/Tacoma Intl

From £249

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 858,174 searches.
Delta
8.0
Very Good
8,212 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very Good
8,212 reviews
Delta
8.0
Very Good
8,212 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very Good
8,212 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very Good
8,212 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air France
7.4
Good
1,449 reviews
Delta
8.0
Very Good
8,212 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines
7.4
Good
8,759 reviews
Delta
8.0
Very Good
8,212 reviews
Check prices

Comfort

8.0

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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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 21 February 2025.

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

    This month, the top selected destinations from Ontario are Guadalajara, Dallas/Fort Worth Airport, Denver. Throughout the year, Denver, Dallas/Fort Worth Airport, Guadalajara 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 £198 to Seattle (prices may vary depending on the airline and departure time). On average, users have booked flights for £297 to fly from Ontario.

  • What is the cheapest first class flight from Ontario?

    If you’re looking for a cheap first-class flight from Ontario, consider Dallas. Prices start at £664 so you can fly first-class even on a budget.

  • What is the cheapest month to fly from Ontario?

    At the present moment the cheapest month to fly from Ontario is currently August; 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 £494 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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