Flights from London to Boston

The cheapest round-trip from London to Boston is about 344 EUR, usually in October 2026; June 2026 is priciest, so booking the low month saves around 158 EUR (~31%). Typical fare ~426 EUR, from 331 priced fares. Flightmussy live data, updated 2026-06-13.

Cheap flights from London (LHR/LGW/STN/LTN/LCY) to Boston (BOS). Free, no signup, no ads, no tracking. Compare every airline across 12 months of fares on one heatmap — including low-cost carriers Google Flights often deprioritises.

Fare insights: London to Boston

Cheapest round-trip seen: 344 EUR, usually around October 2026. Typical fare ~426 EUR. Across the year prices range roughly 344–502 EUR — about 31% cheaper in the low season than the peak (June 2026). Carriers on this route include LEVEL, SWISS, Lufthansa, Iberia.

Based on Flightmussy's live 12-month fare data; prices last updated 2026-06-13. Prices change constantly — search live for current fares.

Cheapest fare by month: London to Boston

The lowest round-trip fare we found for each month over the coming year — low season versus peak at a glance. October 2026 is cheapest; June 2026 is priciest.

Jun 2026502 EUR
Jul 2026470 EUR
Aug 2026433 EUR
Sep 2026395 EUR
Oct 2026344 EUR
Nov 2026426 EUR
Dec 2026426 EUR
Jan 2027426 EUR
Feb 2027426 EUR
Mar 2027426 EUR
Apr 2027501 EUR
May 2027502 EUR

Why search this route on Flightmussy

Frequently asked questions

What is the cheapest month to fly from London to Boston?
The cheapest round-trip fares from London to Boston start around 344 EUR and are typically lowest in October 2026; June 2026 is the most expensive. Fares swing about 31% across the year. (Flightmussy live data, updated 2026-06-13.)
How much does a flight from London to Boston typically cost?
Typical round-trip is ~426 EUR; across the year fares run 344–502 EUR, cheapest 344 EUR in October 2026. Based on 331 priced fares, updated 2026-06-13.
How much can I save flying London to Boston in the cheapest month?
Booking the October 2026 low instead of the June 2026 peak saves about 158 EUR (~31%) per round-trip. Updated 2026-06-13.
Which airlines fly from London to Boston?
Carriers seen on London → Boston in recent searches: LEVEL, SWISS, Lufthansa, Iberia. Flightmussy compares every carrier serving London → Boston, including budget airlines like Wizz Air, Norwegian, Ryanair and easyJet that Google Flights often deprioritises.
Do I need to sign up to search flights from London to Boston?
No. Flightmussy is free and requires no account, no email, and no credit card. Search, compare, and click through to book directly with the airline or booking partner.

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About Flightmussy

Flightmussy is a free flight meta-search built by one person in Oslo. No signup, no ads, no tracking — email is optional, only for route price alerts. Compare fares across airlines and see 12 months of prices at a glance — including low-cost carriers Google Flights often deprioritises (Widerøe, Wizz Air, Norwegian, Ryanair). Pay with a card at the airline, or use the Crypto button on any result to check out in BTC, ETH, USDT, BNB or AVA via Travala.

Flight price data & research

Flightmussy runs its own 12-month forward fare scans across thousands of routes worldwide and publishes the data openly. Read the cheapest month to fly almost anywhere → — a global study of when fares are lowest — or browse the cheapest destinations from a city:

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