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Cheap flights from London Heathrow Airport to Saint John from C$ 589

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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — YSJ
28 May — 4 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to St John

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to St John
Explore the most affordable flight options available from Heathrow to St John. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 April 2026.

Fri 29/56:00 a.m.
LHR
-
YSJ
2 stops21h 52m
Air Canada
Sun 7/64:30 p.m.
YSJ
-
LHR
2 stops24h 30m
Air Canada
Deal found 24/4C$ 1,045
Fri 29/56:00 a.m.
LHR
-
YSJ
2 stops21h 52m
Air Canada
Fri 5/64:30 p.m.
YSJ
-
LHR
1 stop10h 00m
Air Canada
Deal found 28/4C$ 1,056
Wed 10/65:15 p.m.
LHR
-
YSJ
2 stops50h 35m
Air Canada
Wed 17/65:35 a.m.
YSJ
-
LHR
1 stop21h 00m
Air Canada
Deal found 26/4C$ 1,057
Sun 10/59:30 a.m.
LHR
-
YSJ
1 stop10h 10m
Air Canada
Sat 16/512:50 p.m.
YSJ
-
LHR
1 stop19h 00m
Air Canada
Deal found 26/4C$ 1,076
Wed 10/66:50 a.m.
LHR
-
YSJ
2 stops13h 00m
Air Canada
Sun 14/64:30 p.m.
YSJ
-
LHR
1 stop10h 00m
Air Canada
Deal found 24/4C$ 1,078
Fri 12/66:00 a.m.
LHR
-
YSJ
2 stops21h 52m
Air Canada
Fri 19/65:00 a.m.
YSJ
-
LHR
2 stops21h 30m
Air Canada
Deal found 28/4C$ 1,085

Find flight deals from Heathrow to St John

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to St John (YSJ). 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 28 April 2026.

Round-trip from

C$ 1,045

One-way from

C$ 589

Popular in

April

Cheapest in

June

Average price

C$ 1,406
Air Canada
  • Air Canada
  • 29/5-7/6
  • 4 total stops
  • 46h 22m total
  • London to Saint John
Search Deals
20/5
  • 20/5
  • 3 total stops
  • 45h 10m total
  • London to Saint John
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (C$ 350 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Heathrow to St John 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 28 April 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Saint John that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Fri 29/5

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

2 stops21h 52m

Saint John

Sun 7/6

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

2 stops24h 30m

C$ 1,045

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Wed 10/6

5:15 p.m.-3:50 p.m.

2 stops50h 35m

Saint John

Wed 17/6

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

2 stops34h 00m

C$ 1,050
Quickest round-trip

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Wed 10/6

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

2 stops21h 52m

Saint John

Sun 14/6

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

1 stop10h 00m

C$ 1,080

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Thu 14/5

9:30 a.m.-3:40 p.m.

2 stops34h 10m

Saint John

Mon 18/5

4:30 p.m.-10:00 a.m.

1 stop13h 30m

C$ 1,119

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Thu 21/5

8:30 a.m.-11:57 a.m.

1 stop31h 27m

Saint John

Thu 4/6

12:20 p.m.-6:35 a.m.

1 stop14h 15m

C$ 1,124
Cheapest one-way

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Wed 20/5

4:50 p.m.-10:00 a.m.

3 stops45h 10m

C$ 589

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Mon 25/5

9:10 p.m.-10:00 a.m.

3 stops40h 50m

C$ 798
Quickest one-way

LondonSaint John

LHR - YSJ

LHRYSJ

London Heathrow

Wed 20/5

8:30 a.m.-11:52 p.m.

1 stop19h 22m

C$ 2,166

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/4

Sorted by cheapest first

Best time to book a flight from Heathrow to St John

Have a flexible travel schedule? Discover the best time to fly to St John from Heathrow 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 London Heathrow Airport to Saint John

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

Related info for your journey

Find useful and relevant information for your journey from Heathrow to St John. 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 into for flights to Saint John from London Heathrow?

    For a flight from London Heathrow to Saint John, you will be flying into Saint John. Saint John (YSJ) is just 15.1 km from the centre of the city. Saint John is the only Saint John airport and it handles 0 inbound flights from London Heathrow per day. 0 airlines have flights to Saint John from London Heathrow on a regular basis.

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

    A quick flight from London Heathrow Airport to Saint John can take about 21h 52m. Air Canada provides one of the quickest options available for as low as C$ 1,045. The distance between London Heathrow Airport and Saint John is about 4712 km.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to St John 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

Browse thousands of different options on Cheapflights for your next trip

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Complete your trip

Complete your trip to St John by adding a car rental and/or hotel reservation to your travel itinerary.
Saint John car rentals
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Fredericton Airport car rentals
Saint John Airport car rentals
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Fredericton car rentals
Bathurst car rentals

Fly with Cheapflights

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

Deals for Heathrow to St John flights 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 better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from Heathrow to St John by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Need flexible booking options for your flight to St John from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Heathrow to St John flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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