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Cheap flights from Saint John to London, ON from C$ 472

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 20/8. Fares are subject to change and may not be available on all flights or dates of travel.
YSJ — YXU
3 Aug — 10 Aug1
1 adult

Find flight deals from St John to London

One-way flights from St John to London
Search for one-way flight options from St John to London. Find affordable one-way fares based on user searches. Data last updated 29 July 2025.

Wed 20/810:45 a.m.YSJ - YXU
2 stops19h 29mMultiple Airlines
Deal found 27/7C$ 472
Wed 20/85:55 a.m.YSJ - YXU
1 stop4h 22mAir Canada
Deal found 27/7C$ 556

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 29 July 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 - YXU

YSJYXU

Saint John

Wed 20/8

10:45 a.m.-5:14 a.m.

2 stops19h 29m

C$ 472

Saint JohnLondon

YSJ - YXU

YSJYXU

Saint John

Wed 20/8

5:55 a.m.-9:17 a.m.

1 stop4h 22m

C$ 556

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

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, Ontario?

Currently, October is the cheapest month in which you can book a flight from Saint John to London, Ontario (average of C$ 243). Flying from Saint John to London, Ontario in December is currently the most expensive (average of C$ 478). 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 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 29 July 2025.
Get a feel of what it's like to fly with Air Canada from Saint John to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Air Canada
7.1
Good
9,822 reviews
Check prices

Boarding

7.3

Overall

7.1

Entertainment

6.8

Comfort

7.1

Crew

7.8

Food

6.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

YDF - YYZ

Having excellent support for my mobility issues is so much appreciated. Thank you and your awesome crew.
Air Canada
7.1
Good
9,822 reviews
Air Canada
7.1
Good
9,822 reviews
Check prices

Boarding

7.3

Overall

7.1

Entertainment

6.8

Comfort

7.1

Crew

7.8

Food

6.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

YDF - YYZ

Having excellent support for my mobility issues is so much appreciated. Thank you and your awesome crew.

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.

  • 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, Ontario?

    Currently, October is the cheapest month in which you can book a flight from Saint John to London, Ontario (average of C$ 243). Flying from Saint John to London, Ontario in December is currently the most expensive (average of C$ 478). 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.

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