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

In the last 3 days, the lowest price for a flight from Saint John to London Heathrow Airport was C$ 635 for a one-way ticket and C$ 1,054 for a round-trip. Visit our flight page for the latest deals!>/a>

Which airports will I be using when flying from Saint John to London?

When flying out of Saint John you will be using Saint John. You will be landing at London, also known as London Heathrow. Visit our flight page for the latest deals!>/a>

Which aircraft models fly most regularly from Saint John to London?

We unfortunately don’t have that data for this specific route.

Which airline alliances offer flights from Saint John to London?

Star Alliance is the only airline alliance operating flights between Saint John and London.

How does KAYAK find such low prices on flights from Saint John to London?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Saint John to London. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Saint John to London?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Saint John is likely to change within 7 days, so travellers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Saint John to London?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Saint John with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Saint John to London?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Saint John up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

C$ 635 CHEAP FLIGHTS from Saint John to London (YSJ - LHR)

YSJ - LHR

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Cheapest round-trip

C$ 1,054

Air Canada

Fri 2/10Tue 6/10

YSJ - LHR • 1 stop

Cheapest one-way flights

C$ 635

Multiple Airlines

Thu 18/6

YSJ - LHR • 3 stops

Top airlines

Air Canada

Cheapest • from C$ 1,054 (round-trip)

Air Canada

Best reviews • 7.1 score

Airline reviews

Direct flights

Not available

There are currently no direct flights between Saint John and Heathrow. You’ll need at least 1 connection.

Insights

Start a new search

KAYAK searches hundreds of sites at once to find you the best travel deals.

We hope you love your trip to Heathrow!

Flight Deals

Cheap Flights from Saint John to Heathrow (YSJ-LHR)

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Recent round-trip flight deals from Saint John to Heathrow

Fri, 2 Oct - Tue, 6 Oct

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

YSJ

LHR

13h 30m

1 stop

6:00 a.m. - 3:49 p.m.

LHR

YSJ

37h 49m

2 stops

C$ 1,054Air Canada

Tue, 2 Jun - Tue, 9 Jun

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

YSJ

LHR

10h 00m

1 stop

9:30 a.m. - 3:50 p.m.

LHR

YSJ

10h 20m

1 stop

C$ 1,057Air Canada

Fri, 2 Oct - Tue, 6 Oct

12:50 p.m. - 10:00 a.m.

YSJ

LHR

17h 10m

2 stops

6:00 a.m. - 3:49 p.m.

LHR

YSJ

37h 49m

2 stops

C$ 1,065Air Canada

Tue, 2 Jun - Tue, 9 Jun

4:30 p.m. - 9:35 a.m.

YSJ

LHR

13h 05m

2 stops

9:30 a.m. - 3:50 p.m.

LHR

YSJ

10h 20m

1 stop

C$ 1,068Air Canada

Fri, 2 Oct - Tue, 6 Oct

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

YSJ

LHR

10h 00m

1 stop

9:30 a.m. - 3:49 p.m.

LHR

YSJ

10h 19m

1 stop

C$ 1,075Air Canada

Tue, 2 Jun - Tue, 9 Jun

4:30 p.m. - 9:35 a.m.

YSJ

LHR

13h 05m

2 stops

2:05 p.m. - 11:52 p.m.

LHR

YSJ

13h 47m

2 stops

C$ 1,079Air Canada

Tue, 2 Jun - Tue, 9 Jun

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

YSJ

LHR

13h 30m

1 stop

2:05 p.m. - 11:52 p.m.

LHR

YSJ

13h 47m

2 stops

C$ 1,083Air Canada

Tue, 2 Jun - Tue, 9 Jun

4:30 p.m. - 9:35 a.m.

YSJ

LHR

13h 05m

2 stops

9:30 a.m. - 11:52 p.m.

LHR

YSJ

18h 22m

2 stops

C$ 1,092Air Canada

Mon, 18 May - Wed, 27 May

4:30 p.m. - 9:25 p.m.

YSJ

LHR

24h 55m

2 stops

3:20 p.m. - 3:40 p.m.

LHR

YSJ

28h 20m

2 stops

C$ 1,144United Airlines

Mon, 18 May - Wed, 27 May

4:30 p.m. - 9:25 p.m.

YSJ

LHR

24h 55m

2 stops

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

LHR

YSJ

25h 40m

2 stops

C$ 1,146United Airlines

Booking Insights

KAYAK's insights & trends for Saint John to Heathrow flights

Get data-powered insights and trends into flights from Saint John to Heathrow to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Saint John to London?

In the past 3 days, the cheapest round-trip tickets from Saint John to London were found on Air Canada (C$ 1,054) and United Airlines (C$ 1,144).

Find deals

Cheapest flight	C$ 635

Flight from Saint John to London

When to book flights from Saint John to Heathrow

Are your dates flexible? Find out the best times to travel from Saint John to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

What is the cheapest flight from Saint John to London Heathrow Airport?
In the last 3 days, the lowest price for a flight from Saint John to London Heathrow Airport was C$ 635 for a one-way ticket and C$ 1,054 for a round-trip.
Which airports will I be using when flying from Saint John to London?
When flying out of Saint John you will be using Saint John. You will be landing at London, also known as London Heathrow.
Which aircraft models fly most regularly from Saint John to London?
We unfortunately don’t have that data for this specific route.
Which airline alliances offer flights from Saint John to London?
Star Alliance is the only airline alliance operating flights between Saint John and London.
How does KAYAK find such low prices on flights from Saint John to London?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Saint John to London.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Saint John to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Saint John is likely to change within 7 days, so travellers know whether to wait or book now.
What is the Hacker Fare option on flights from Saint John to London?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Saint John with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Saint John to London?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Saint John up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Saint John to Heathrow

Need help choosing which airline to fly with from Saint John to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.

7.1

Air CanadaOverall score based on 10998 reviews

7.8Crew

6.3Food

7.3Boarding

7.1Comfort

6.8Entertainment

Airline reviews

I cannot think how they could put more seats together but they did. So elbow to elbow leg to leg for these long journeys they should consider leg space at least. Since they did not offer to check people's carry one space was tight and if you did not get on first people used your assigned overhead storage so now your doing these same to another. Cascading inconvenience.

6.0 GoodMichelle, Apr 2026

YYZ - EDI

Everything you need to know for your flight from Saint John to Heathrow

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Saint John (YSJ)

Heathrow (LHR)

YSJ - LHR

C$ 635 Find Cheap Flights from Saint John to London

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

Everything you should know

Cheap Flights from Saint John to Heathrow (YSJ-LHR)

Recent round-trip flight deals from Saint John to Heathrow

Recent one-way flight deals from Saint John to Heathrow

KAYAK's insights & trends for Saint John to Heathrow flights

Get data-powered insights and trends into flights from Saint John to Heathrow to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Saint John to London?

In the past 3 days, the cheapest round-trip tickets from Saint John to London were found on Air Canada (C$ 1,054) and United Airlines (C$ 1,144).

Good to know

When to book flights from Saint John to Heathrow

FAQs for booking Saint John to London flights

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

In the last 3 days, the lowest price for a flight from Saint John to London Heathrow Airport was C$ 635 for a one-way ticket and C$ 1,054 for a round-trip.

Which airports will I be using when flying from Saint John to London?

When flying out of Saint John you will be using Saint John. You will be landing at London, also known as London Heathrow.

Which aircraft models fly most regularly from Saint John to London?

We unfortunately don’t have that data for this specific route.

Which airline alliances offer flights from Saint John to London?

Star Alliance is the only airline alliance operating flights between Saint John and London.

How does KAYAK find such low prices on flights from Saint John to London?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Saint John to London.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Saint John to London?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Saint John is likely to change within 7 days, so travellers know whether to wait or book now.

What is the Hacker Fare option on flights from Saint John to London?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Saint John with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Saint John to London?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Saint John up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Saint John to Heathrow

Everything you need to know for your flight from Saint John to Heathrow

Information on your arrival and departure airports

Cabin class types available on flights to Heathrow

Complete your trip to London with a hotel stay or car rental

Find direct flights to and from Saint John and Heathrow

Flights to other popular destinations

Flights from domestic origins to Heathrow

Choose which airport to fly into in London