Boston to London flights
The cheapest round trip we found from Boston to London is $734 (Feb 20 – 25, 2027, 1 stop), 5% below the usual $773.
BOS to LON · Round trip · Economy · Prices per person in USD · Price found (3 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $773 |
| December 2026 | No fares found yet |
| January 2027 | No fares found yet |
| February 2027 | $734 |
| March 2027 | $603 (cheapest month) |
| April 2027 | $794 |
| May 2027 | No fares found yet |
| June 2027 | No fares found yet |
| July 2027 | No fares found yet |
| August 2027 | No fares found yet |
| September 2027 | No fares found yet |
| October 2027 | $780 |
Cheapest dates in the next 4 months
Round trip, per person-
Feb 20 – 25, 2027 5 nights · leave Sat$734 −5% vs usual$734 −5% vs usual Book
Icelandair 1 stop · 8h 30m -
Nov 24 – Dec 11 17 nights · leave Tue$773$773 Book
TAP Air Portugal 1 stop · 9h 05m -
Feb 20 – 27, 2027 7 nights · leave Sat$775$775 Book
Icelandair 1 stop · 8h 30m
-
Nov 25 – Dec 1 6 nights · leave Wed$905 +17% vs usual$905 +17% vs usual Book
Aer Lingus 1 stop · 7h 25m -
Nov 24 – 30 6 nights · leave Tue$910 +18% vs usual$910 +18% vs usual Book
SWISS 1 stop · 9h 20m -
Nov 25 – 30 5 nights · leave Wed$910 +18% vs usual$910 +18% vs usual Book
SWISS 1 stop · 9h 20m
-
Nov 20 – 30 10 nights · leave Fri$1,049 +36% vs usual$1,049 +36% vs usual Book
Air Canada 1 stop · 7h 44m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in London
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Airport transfer to London
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Plan the rest of your trip
London · Feb 20 – 25, 2027- eSIM for United Kingdom Yesim · prepaid mobile data (opens Yesim in a new tab)
- Car rental in United Kingdom Economybookings · compare rental companies (opens Economybookings in a new tab)
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Good to know
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Boston to London: questions
How much does a flight from Boston to London cost?
The cheapest round trip we have found right now is $734, leaving February 20 and returning February 25. The usual price on this route is about $773, so this fare is 5% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from Boston to London?
March 2027, with round trips from $603. The most expensive month in our data is April (from $794). Based on the 5 months ahead we have prices for.
Which airports do Boston to London flights use?
Boston airports include Logan International (BOS) and Pease Air Force Base (PSM). London airports include London Heathrow (LHR), London City (LCY) and London Gatwick (LGW). The prices on this page cover every airport in both cities (BOS and LON are the city codes).
About this route
We track round-trip economy fares from Boston (United States) to London (United Kingdom) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $734, departing February 20 and returning February 25, about 5% below the usual $773. Right now we're following 7 upcoming date combinations on this route. The cheapest month to fly in our data is March, from $603. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.