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Cheap flights from Saint John to London Heathrow Airport from C$ 915

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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
YSJ — LHR
25 Feb — 4 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from St John to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from St John to Heathrow
Explore the most affordable flight options available from St John to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 January 2026.

Thu 12/34:15 p.m.
YSJ
-
LHR
1 stop11h 55m
Air Canada
Thu 19/36:00 a.m.
LHR
-
YSJ
2 stops36h 40m
Air Canada
Deal found 26/1C$ 1,033
Thu 19/34:15 p.m.
YSJ
-
LHR
1 stop11h 55m
Air Canada
Mon 23/31:25 p.m.
LHR
-
YSJ
1 stop29h 10m
Air Canada
Deal found 23/1C$ 1,068
Tue 31/35:40 a.m.
YSJ
-
LHR
1 stop23h 55m
Air Canada
Sun 5/46:00 a.m.
LHR
-
YSJ
2 stops21h 52m
Air Canada
Deal found 24/1C$ 1,078
Thu 19/34:15 p.m.
YSJ
-
LHR
2 stops15h 10m
United Airlines
Mon 23/34:20 p.m.
LHR
-
YSJ
2 stops26h 15m
United Airlines
Deal found 23/1C$ 1,140

Find flight deals from St John to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from St John (YSJ) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 26 January 2026.

Round-trip from

C$ 1,033

One-way from

C$ 915

Popular in

December

Cheapest in

February

Average price

C$ 1,148
Air Canada
  • Air Canada
  • 12/3-19/3
  • 3 total stops
  • 48h 35m total
  • Saint John to London
Search Deals
12/3
  • 12/3
  • 3 total stops
  • 23h 40m total
  • Saint John to London
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 103 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 31 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St John to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 26 January 2026.
Use the filters below to find and compare flights from Saint John to London Heathrow Airport that are best for you.

Fly from

St John

Fly to

Heathrow

Route

Depart

Return

Price

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 12/3

4:15 p.m.-7:10 a.m.

1 stop11h 55m

London Heathrow

Thu 19/3

6:00 a.m.-3:40 p.m.

2 stops36h 40m

C$ 1,033

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 19/3

4:15 p.m.-7:10 a.m.

1 stop11h 55m

London Heathrow

Mon 23/3

1:25 p.m.-3:35 p.m.

1 stop29h 10m

C$ 1,074

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Tue 31/3

11:30 a.m.-8:35 a.m.

1 stop17h 05m

London Heathrow

Sun 5/4

6:00 a.m.-11:52 p.m.

2 stops21h 52m

C$ 1,078

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 19/3

4:15 p.m.-10:50 a.m.

2 stops15h 35m

London Heathrow

Mon 23/3

4:20 p.m.-3:35 p.m.

2 stops26h 15m

C$ 1,145

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 12/3

4:15 p.m.-6:55 p.m.

3 stops23h 40m

C$ 915

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Tue 10/3

4:15 p.m.-9:20 a.m.

2 stops38h 05m

C$ 1,086

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 12/3

4:15 p.m.-8:35 p.m.

2 stops25h 20m

C$ 1,167

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/1

Best time to book a flight from St John to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from St John with our price prediction graph.
Estimated round-trip 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.

Cheapflights Insights

Everything you need to know about your flight from Saint John to London Heathrow Airport

What is the cheapest month to book a flight from Saint John to London Heathrow Airport?

Currently, March is the cheapest month in which you can book a flight from Saint John to London Heathrow Airport (average of C$ 738). Flying from Saint John to London Heathrow Airport in December is currently the most expensive (average of C$ 1,268). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Saint John to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 26 January 2026.
Read reviews from past customers who have flown Air Canada from Saint John to London Heathrow Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,656 reviews
Check prices

Boarding

7.3

Food

6.3

Entertainment

6.8

Comfort

7.1

Overall

7.1

Crew

7.8

Reviews

1 / 20
4.0
Okay

Sugith,Jan 2026

YSB - YYZ

Left 2 hours late. Stuck on plane for an hour after boarding before take off.
Air Canada
7.1
Good
10,656 reviews
Air Canada
7.1
Good
10,656 reviews
Check prices

Boarding

7.3

Food

6.3

Entertainment

6.8

Comfort

7.1

Overall

7.1

Crew

7.8

Reviews

1 / 20
4.0
Okay

Sugith,Jan 2026

YSB - YYZ

Left 2 hours late. Stuck on plane for an hour after boarding before take off.

Related info for your journey

Find useful and relevant information for your journey from St John to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Saint John to London Heathrow?

    Located just 15.1 km from the city centre, Saint John is the airport most travellers will use when flying to London Heathrow from Saint John. Booking flights from Saint John (YSJ) to London Heathrow should be relatively easy as there are 0 daily outbound flights to London Heathrow from 1 airline.

  • How long is the flight from Saint John to London Heathrow Airport?

    Departing from Saint John to London Heathrow Airport will take you 11h 55m. Airlines will cover a distance of 4712 km.

  • What is the cheapest airline to fly from Saint John to London Heathrow Airport round-trip?

    According to our current data, Air Canada (C$ 1,158), offers the cheapest pricing from Saint John to London Heathrow Airport. Users have found that Air Canada is 4% cheaper than the other options available to this destination.

  • Can I find deals for flights from St John to Heathrow that include hotel bookings?

    Yes. In addition to deals on St John to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St John to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St John to Heathrow.

  • Can I find deals for business class flights from St John to Heathrow?

    Yes. Cheapflights offers flight deals from St John to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Saint John to London Heathrow Airport?

    Currently, March is the cheapest month in which you can book a flight from Saint John to London Heathrow Airport (average of C$ 738). Flying from Saint John to London Heathrow Airport in December is currently the most expensive (average of C$ 1,268). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Sutton
Twickenham
Gatwick
Slough
Marlow
Cobham
Milton Keynes
Leamington Spa
Romford
Bedford
Watford
Luton
High Wycombe
Stratford-upon-Avon
Hounslow

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from St John to Heathrow

Discover the top airline that operate flights from St John to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 26 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 1,143AverageC$ 1,265FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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How does Cheapflights help users find flights from St John to Heathrow?

Cheapflights makes it easy to find St John to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from St John to Heathrow?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from St John.

Can Cheapflights find flights from St John to Heathrow with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from St John to Heathrow flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from St John to Heathrow become cheaper?

Yes! Start tracking prices for St John to Heathrow flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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