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£34+ 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 17/2. 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
13 Dec — 20 Dec1
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 13 November 2025.

Cheapest one-way flight

£37

Cheapest round-trip flight

£93

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£66 or less

Good one-way deal

£33 or less
The cheapest one-way flight from Ontario is currently to San Francisco.
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The cheapest round-trip flight from Ontario is currently to San Francisco.
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On average, Alaska Airlines currently has the cheapest one-way flight from Ontario (avg. price of £90).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £373).
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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 13 November 2025.

Thu 5/206:30ONT - PHX
1 stop10h 19mFrontier
Mon 9/218:54PHX - ONT
1 stop3h 23mFrontier
Deal found 12/11£98
Tue 25/1100:58ONT - PHX
1 stop6h 57mFrontier
Fri 28/1109:23PHX - ONT
1 stop6h 03mFrontier
Deal found 12/11£132
Sat 13/1206:40ONT - PHX
1 stop16h 11mDelta
Tue 16/1214:40PHX - ONT
1 stop9h 07mDelta
Deal found 10/11£171
Thu 11/1206:00ONT - PHX
2 stops12h 05mDelta
Sun 14/1208:00PHX - ONT
1 stop15h 47mDelta
Deal found 10/11£175
Fri 6/213:28ONT - PHX
1 stop3h 21mFrontier
Mon 9/218:54PHX - ONT
1 stop3h 23mFrontier
Deal found 12/11£179
Thu 4/1213:29ONT - PHX
2 stops9h 22mDelta
Mon 8/1219:55PHX - ONT
2 stops17h 39mDelta
Deal found 10/11£180
Thu 1/108:30ONT - PHX
Nonstop1h 15mSouthwest
Tue 6/115:10PHX - ONT
1 stop3h 00mSouthwest
Deal found 12/11£180
Sat 14/205:25ONT - PHX
Nonstop1h 15mSouthwest
Sun 15/217:55PHX - ONT
1 stop5h 05mSouthwest
Deal found 11/11£184
Thu 11/1206:40ONT - PHX
1 stop11h 25mDelta
Tue 16/1208:00PHX - ONT
1 stop15h 47mDelta
Deal found 10/11£187
Sat 13/1209:05ONT - PHX
Nonstop1h 15mSouthwest
Tue 16/1212:40PHX - ONT
2 stops5h 10mSouthwest
Deal found 12/11£187
Fri 12/1206:40ONT - PHX
1 stop11h 25mDelta
Mon 15/1208:00PHX - ONT
2 stops16h 58mDelta
Deal found 10/11£190
Wed 3/1208:40ONT - PHX
1 stop3h 00mSouthwest
Mon 8/1220:45PHX - ONT
Nonstop1h 10mSouthwest
Deal found 10/11£191

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

Fly to

Heathrow

Route

Depart

Return

Price

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 13/12

12:40-23:51

1 stop10h 11m

Phoenix Sky Harbor Intl

Mon 15/12

19:55-12:34

2 stops17h 39m

£175

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 11/12

16:49-11:07

2 stops17h 18m

Phoenix Sky Harbor Intl

Mon 15/12

19:55-11:13

1 stop16h 18m

£175

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 1/1

08:30-10:45

Nonstop1h 15m

Phoenix Sky Harbor Intl

Tue 6/1

15:10-17:10

1 stop3h 00m

£180

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 13/12

05:50-08:05

Nonstop1h 15m

Phoenix Sky Harbor Intl

Tue 16/12

05:25-09:40

1 stop5h 15m

£184

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Thu 11/12

06:40-19:05

1 stop11h 25m

Phoenix Sky Harbor Intl

Tue 16/12

08:00-22:47

1 stop15h 47m

£187

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Fri 12/12

06:40-19:05

1 stop11h 25m

Phoenix Sky Harbor Intl

Tue 16/12

14:40-22:47

1 stop9h 07m

£187

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 6/12

15:25-17:40

Nonstop1h 15m

Phoenix Sky Harbor Intl

Mon 8/12

05:25-09:40

1 stop5h 15m

£194

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Sat 13/12

15:25-17:40

Nonstop1h 15m

Phoenix Sky Harbor Intl

Mon 15/12

06:10-10:35

1 stop5h 25m

£194

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 20/1

10:40-17:40

2 stops6h 00m

Phoenix Sky Harbor Intl

Tue 27/1

16:15-20:20

2 stops5h 05m

£199

OntarioPhoenix

ONT - PHX

ONTPHX

Ontario

Tue 16/12

06:40-15:42

1 stop8h 02m

Phoenix Sky Harbor Intl

Tue 16/12

19:55-11:13

1 stop16h 18m

£202

Flights are sorted by cheapest return flights first.

Deals found on 11/11

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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 7 November 2025.

Booking 62 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, January is the cheapest month in which you can book a flight from Ontario (average of £361). Flying from Ontario in June will prove the most costly (average of £532). 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 (94 flights per day), Dallas (93 flights per day) and Atlanta (83 flights per day).

Portland
Portland
From £66
Dallas/Fort Worth
Dallas/Fort Worth
From £221
Phoenix Sky Harbor Intl
Phoenix Sky Harbor Intl
From £192
San Francisco
San Francisco
From £649

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Denver Intl, with prices starting at £33. Explore other affordable destinations below.

Denver Intl
Denver Intl
From £33
Portland
Portland
From £66
Phoenix Sky Harbor Intl
Phoenix Sky Harbor Intl
From £192
Dallas/Fort Worth
Dallas/Fort Worth
From £221

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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 13 November 2025.

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

    This month, the top selected destinations from Ontario are Dallas/Fort Worth Airport, Denver, Guadalajara. Throughout the year, Dallas/Fort Worth Airport, Denver, 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 £33 to Denver (prices may vary depending on the airline and departure time). On average, users have booked flights for £336 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 January; 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 £448 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!

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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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