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Cheap flights from Saint John to London from C$ 654

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 29/11. Fares are subject to change and may not be available on all flights or dates of travel.
YSJ — LON
16 Nov — 23 Nov1
1 adult
1 adult, Economy

Find flight deals from St John to London

Enter your travel dates to find the best prices.

Cheapest flights from St John to London
Explore the most affordable flight options available from St John to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.

Tue 18/114:15 p.m.YSJ - LHR
1 stop10h 55mAir Canada
Sun 23/116:50 a.m.LHR - YSJ
2 stops12h 43mAir Canada
Deal found 16/10C$ 1,005
Tue 18/1112:00 p.m.YSJ - LHR
3 stops27h 30mMultiple Airlines
Sun 23/118:35 p.m.LHR - YSJ
2 stops30h 54mMultiple Airlines
Deal found 16/10C$ 1,502

Cheap flight deals from St John to London

Discover tips and strategies to find the most affordable flight options for your journey from St John (YSJ) to London (LON). 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 17 October 2025.

Round-trip from

C$ 1,004

One-way from

C$ 654

Popular in

December

Cheapest in

March

Average price

C$ 1,102
Air Canada
  • Air Canada
  • 16/1-26/1
  • 3 total stops
  • 66h 25m total
  • Saint John to London
Search Deals
29/11
  • 29/11
  • 2 total stops
  • 30h 55m total
  • Saint John to London
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 245 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 33 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from St John to London 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 17 October 2025.
Use the filters below to find and compare flights from Saint John to London that are best for you.

Fly from

St John

Fly to

London

Route

Depart

Return

Price

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Fri 16/1

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

1 stop10h 55m

London Heathrow

Mon 26/1

12:05 p.m.-3:35 p.m.

2 stops55h 30m

C$ 1,004

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Tue 18/11

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

1 stop10h 55m

London Heathrow

Sun 23/11

6:50 a.m.-3:33 p.m.

2 stops12h 43m

C$ 1,005

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 26/2

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

1 stop10h 55m

London Heathrow

Fri 6/3

9:00 a.m.-10:49 a.m.

2 stops29h 49m

C$ 1,011

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Fri 20/2

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

2 stops13h 05m

London Heathrow

Tue 24/2

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

2 stops18h 29m

C$ 1,011

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Thu 26/2

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

1 stop10h 55m

London Heathrow

Sat 7/3

6:50 a.m.-3:35 p.m.

2 stops12h 45m

C$ 1,012

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Fri 27/2

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

2 stops13h 05m

London Heathrow

Sat 7/3

6:50 a.m.-3:35 p.m.

2 stops12h 45m

C$ 1,012

Saint JohnLondon

YSJ - LGW

YSJLGW

Saint John

Wed 11/3

11:30 a.m.-10:35 p.m.

2 stops32h 05m

London Gatwick

Mon 23/3

5:05 p.m.-10:49 a.m.

2 stops44h 44m

C$ 2,447

Saint JohnLondon

YSJ - LGW

YSJLGW

Saint John

Fri 16/1

4:15 p.m.-10:35 p.m.

2 stops26h 20m

London Gatwick

Mon 26/1

6:25 a.m.-10:49 a.m.

2 stops32h 24m

C$ 3,665

Saint JohnLondon

YSJ - LGW

YSJLGW

Saint John

Fri 27/2

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

2 stops24h 20m

London Gatwick

Sat 7/3

6:40 p.m.-9:49 a.m.

2 stops43h 09m

C$ 5,410

Saint JohnLondon

YSJ - LHR

YSJLHR

Saint John

Sat 29/11

11:45 a.m.-10:40 p.m.

2 stops30h 55m

C$ 654

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/10

Showing 1-10 of 17 results
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Best time to book a flight from St John to London

Have a flexible travel schedule? Discover the best time to fly to London 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

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

Currently, March is the cheapest month in which you can book a flight from Saint John to London (average of C$ 769). Flying from Saint John to London in December is currently the most expensive (average of C$ 1,300). 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?

What’s the top layover airport for flights from Saint John to London?

Share of one-stop round-trip flights from Saint John to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Toronto (YYZ) – chosen by Cheapflights users on 79% of one-stop itineraries from Saint John to London on Cheapflights.

What’s the cheapest layover airport for flights from Saint John to London?

Average round-trip fare for 1-stop flights from Saint John to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Montreal (YUL) is the most affordable 1-stop option, with an average round-trip price of C$ 1,225.

What’s the fastest layover option from Saint John to London?

Shortest average travel time for 1-stop one-way flights from Saint John to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Montreal (YUL) have the shortest average one-way travel time for 1-stop routes: 10h 15m.

Which airport typically offers the quickest layover for flights from Saint John to London?

Average layover duration for 1-stop one-way flights from Saint John to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Montreal (YUL) offer the fastest connection on this route, with an average layover time of 1h 57m.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 17 October 2025.
Check out reviews from past customers who have flown with Air Canada from Saint John to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
10,306 reviews
Check prices

Overall

7.1

Comfort

7.1

Food

6.3

Boarding

7.3

Crew

7.8

Entertainment

6.8

Reviews

1 / 20
2.0
Mediocre

robert,Sep 2025

YEG - YVR

There was nothing that I liked about air canada. My experience was terrible.
Air Canada
7.1
Good
10,306 reviews
Air Canada
7.1
Good
10,306 reviews
Check prices

Overall

7.1

Comfort

7.1

Food

6.3

Boarding

7.3

Crew

7.8

Entertainment

6.8

Reviews

1 / 20
2.0
Mediocre

robert,Sep 2025

YEG - YVR

There was nothing that I liked about air canada. My experience was terrible.

Related info for your journey

Find useful and relevant information for your journey from St John to London. 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?

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

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

    Airlines like Air Canada fly from Saint John to London in about 10h 55m. The time it takes to get you to your destination can typically vary by up to . Saint John and London are separated by a distance of 4712 km.

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

    Currently priced at C$ 1,172, Air Canada will fly you from Saint John to London and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. You may be able to fly from Saint John to London for 7% less than the average price by searching for this airline.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St John to London 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?

    Currently, March is the cheapest month in which you can book a flight from Saint John to London (average of C$ 769). Flying from Saint John to London in December is currently the most expensive (average of C$ 1,300). 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?

Book flights to London if you plan to visit one of these locations
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Top airline flying from St John to London

Discover the top airline that operate flights from St John to London. 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 17 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 1,172AverageC$ 1,240FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

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

Certainly. Search results for flights to London from St John shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Of course! You can now track prices for flights from St John to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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