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Cheap flights from Saint John to London Heathrow Airport from C$ 570

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
YSJ — LHR
23 Aug — 30 Aug1
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 24 July 2026.

Sat 5/94:40 p.m.
YSJ
-
LHR
2 stops13h 45m
United Airlines
Sat 12/94:40 p.m.
LHR
-
YSJ
2 stops27h 19m
United Airlines
Deal found 22/7C$ 1,153
Mon 19/104:40 p.m.
YSJ
-
LHR
1 stop13h 20m
Multiple Airlines
Mon 26/106:00 a.m.
LHR
-
YSJ
2 stops20h 24m
Multiple Airlines
Deal found 19/7C$ 1,322
Mon 19/104:40 p.m.
YSJ
-
LHR
1 stop13h 20m
Air Canada
Mon 26/101:00 p.m.
LHR
-
YSJ
1 stop24h 25m
Air Canada
Deal found 19/7C$ 1,340
Sun 6/94:40 p.m.
YSJ
-
LHR
1 stop9h 50m
Air Canada
Sun 13/99:30 a.m.
LHR
-
YSJ
1 stop10h 29m
Air Canada
Deal found 23/7C$ 1,373
Wed 19/84:40 p.m.
YSJ
-
LHR
1 stop13h 20m
Air Canada
Wed 26/89:30 a.m.
LHR
-
YSJ
1 stop10h 30m
Air Canada
Deal found 22/7C$ 1,444
Sun 26/712:50 p.m.
YSJ
-
LHR
1 stop13h 45m
Air Canada
Sun 2/89:30 a.m.
LHR
-
YSJ
2 stops19h 25m
Air Canada
Deal found 21/7C$ 1,913

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 24 July 2026.

Round-trip from

C$ 1,153

One-way from

C$ 570
United Airlines
  • United Airlines
  • 5/9-12/9
  • 4 total stops
  • 41h 04m total
  • Saint John to London
Search Deals
18/9
  • 18/9
  • 3 total stops
  • 41h 20m total
  • Saint John to London
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 24 July 2026.
Use the filters below to find and compare flights from Saint John to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Sat 5/9

4:40 p.m.-10:25 a.m.

2 stops13h 45m

London Heathrow

Sat 12/9

4:40 p.m.-3:59 p.m.

2 stops27h 19m

C$ 1,153

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Mon 19/10

4:40 p.m.-10:00 a.m.

1 stop13h 20m

London Heathrow

Mon 26/10

6:00 a.m.-11:24 p.m.

2 stops20h 24m

C$ 1,322

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Mon 19/10

4:40 p.m.-10:00 a.m.

1 stop13h 20m

London Heathrow

Mon 26/10

1:00 p.m.-10:25 a.m.

1 stop24h 25m

C$ 1,340
Quickest round-trip

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Sun 6/9

4:40 p.m.-6:30 a.m.

1 stop9h 50m

London Heathrow

Sun 13/9

9:30 a.m.-3:59 p.m.

1 stop10h 29m

C$ 1,373

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Wed 19/8

4:40 p.m.-10:00 a.m.

1 stop13h 20m

London Heathrow

Wed 26/8

9:30 a.m.-4:00 p.m.

1 stop10h 30m

C$ 1,444
Cheapest one-way

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Fri 18/9

10:45 a.m.-8:05 a.m.

3 stops41h 20m

C$ 570

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Wed 19/8

10:45 a.m.-6:55 p.m.

3 stops28h 10m

C$ 712

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 3/9

12:50 p.m.-8:35 a.m.

1 stop15h 45m

C$ 998
Quickest one-way

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 3/9

12:50 p.m.-8:05 a.m.

2 stops15h 15m

C$ 1,097

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 3/9

4:40 p.m.-10:25 a.m.

2 stops37h 45m

C$ 1,385

Flights are sorted by cheapest round-trip flights first.

Deals found on 21/7

Showing 1-10 of 11 resultsSorted by cheapest first
1
2

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.

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 24 July 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
11,377 reviews
Check prices

Overall

7.1

Boarding

7.3

Crew

7.8

Comfort

7.1

Food

6.3

Entertainment

6.8

Reviews

1 / 20
8.0
Excellent

Tanis,Jul 2026

YVR - YXC

I needed assistance due to a knee injury and the staff at Air Canada from the checkin right to boarding the plane was incredible! Then on the plane although it was almost full they made it so I DID NOT have anyone seated next to me so I could put my legs up onto the edge of the seat which made things so much easier to travel the hour & a half flight! Very impressed!
Air Canada
7.1
Good
11,377 reviews
Air Canada
7.1
Good
11,377 reviews
Check prices

Overall

7.1

Boarding

7.3

Crew

7.8

Comfort

7.1

Food

6.3

Entertainment

6.8

Reviews

1 / 20
8.0
Excellent

Tanis,Jul 2026

YVR - YXC

I needed assistance due to a knee injury and the staff at Air Canada from the checkin right to boarding the plane was incredible! Then on the plane although it was almost full they made it so I DID NOT have anyone seated next to me so I could put my legs up onto the edge of the seat which made things so much easier to travel the hour & a half flight! Very impressed!

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 13h 20m. Airlines will cover a distance of 4712 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    According to our current data, Air Canada (C$ 1,293), offers the cheapest pricing from Saint John to London Heathrow Airport.

  • 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.

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
Gatwick
Romford
Twickenham
Ilford
Bromley
Sutton
Luton
Slough
Marlow
Cobham
Hounslow
Leamington Spa
Northampton
Watford
High Wycombe
Stratford-upon-Avon
Moreton-in-Marsh

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 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 1,293AverageC$ 1,475FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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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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