Find flights
When to book
Airlines
FAQs

Cheap flights from Saint John to London Heathrow Airport from C$ 599

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 26/10. Fares are subject to change and may not be available on all flights or dates of travel.
YSJ — LHR
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap 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 11 September 2025.

Round-trip from

C$ 1,025

One-way from

C$ 599

Popular in

March

Cheapest in

February

Average price

C$ 1,190
Air Canada
  • Air Canada
  • 20/2-24/2
  • 3 total stops
  • 44h 39m total
  • Saint John to London
Search Deals
26/10
  • 26/10
  • 2 total stops
  • 28h 10m total
  • Saint John to London
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease (C$ 15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from St John to Heathrow

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 11 September 2025.

Tue 16/95:55 a.m.YSJ - LHR
2 stops20h 35mAir Canada
Tue 23/96:50 a.m.LHR - YSJ
2 stops14h 56mAir Canada
Deal found 9/9C$ 982
Wed 24/96:40 p.m.YSJ - LHR
1 stop13h 10mAir Canada
Wed 1/102:05 p.m.LHR - YSJ
1 stop24h 44mAir Canada
Deal found 11/9C$ 1,255

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 11 September 2025.
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

Fri 20/2

5:40 a.m.-11:50 a.m.

1 stop26h 10m

London Heathrow

Tue 24/2

9:00 a.m.-11:29 p.m.

2 stops18h 29m

C$ 1,025

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Tue 6/1

11:55 a.m.-7:10 a.m.

1 stop15h 15m

London Heathrow

Tue 13/1

9:00 a.m.-11:29 p.m.

2 stops18h 29m

C$ 1,074

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Wed 24/9

6:40 p.m.-11:50 a.m.

1 stop13h 10m

London Heathrow

Wed 1/10

2:05 p.m.-10:49 a.m.

1 stop24h 44m

C$ 1,255

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Sun 26/10

5:40 a.m.-12:50 p.m.

2 stops28h 10m

C$ 599

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Sun 26/10

6:15 p.m.-11:20 a.m.

1 stop14h 05m

C$ 1,020

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Fri 10/10

5:55 a.m.-10:00 a.m.

1 stop24h 05m

C$ 1,164

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

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, January is the cheapest month in which you can book a flight from Saint John to London Heathrow Airport (average of C$ 560). Flying from Saint John to London Heathrow Airport in July is currently the most expensive (average of C$ 856). 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.

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 11 September 2025.
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
10,000 reviews
Check prices

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Crew

7.8

Overall

7.1

Reviews

1 / 20
8.0
Excellent

Graeme,Sep 2025

YWG - YVR

Why not start boarding from the higher seat numbers? Easier movement for everyone. Easier to put baggage in over head lockers. Unable to get a coffee due to air turbulence, but not offered the chance to have a coffee once it had ceased.
Air Canada
7.1
Good
10,000 reviews
Air Canada
7.1
Good
10,000 reviews
Check prices

Boarding

7.3

Entertainment

6.8

Comfort

7.1

Food

6.3

Crew

7.8

Overall

7.1

Reviews

1 / 20
8.0
Excellent

Graeme,Sep 2025

YWG - YVR

Why not start boarding from the higher seat numbers? Easier movement for everyone. Easier to put baggage in over head lockers. Unable to get a coffee due to air turbulence, but not offered the chance to have a coffee once it had ceased.

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 26h 10m. 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$ 1,157), offers the cheapest pricing from Saint John to London Heathrow Airport. Users have found that Air Canada is 5% 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, January is the cheapest month in which you can book a flight from Saint John to London Heathrow Airport (average of C$ 560). Flying from Saint John to London Heathrow Airport in July is currently the most expensive (average of C$ 856). 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
Brentford
Sutton
Hounslow
Slough
Marlow
Leamington Spa
Milton Keynes
Romford
Watford
Bedford
Luton
Southall

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 1,157AverageC$ 1,206FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.