London → Boston flight prices
Flare is a flight-deal alert app for iPhone and Android: it scans fares and flags unusually low prices. Flare is not an airline, not a travel agency and not Flair Airlines. You book with the airline or the provider.
What Flare's scans show for London to Boston
Over the last 130 days of scans, the lowest one-way fare Flare found from London (LON) to Boston (BOS) was €187, on 22 Aug 2026. On a typical day the cheapest fare found was around €381, and the latest daily low, on 25 Oct 2026, was €367.
The latest daily low is close to the typical level for this route.
For return trips, the lowest fare found was €300 on 11 Sept 2026, with a typical daily low of €512 over 116 days.
Month by month
| Month | Lowest found | Typical daily low | Days observed |
|---|---|---|---|
| June 2026 | €309 | €338 | 18 |
| July 2026 | €309 | €443 | 30 |
| August 2026 | €187 | €362 | 27 |
| September 2026 | €296 | €385 | 30 |
| October 2026 | €335 | €367 | 25 |
How to read these prices
Flare scans fares from its departure markets several times a day. For each day, this page keeps the lowest one-way fare found for London to Boston, whatever the travel date. Amounts are in euros. They are timestamped observations, not quotes or guarantees: recheck dates, airports, baggage and the payable total with the provider before booking.
FAQ
What is the cheapest fare Flare has seen from London to Boston?
€187 one-way, found on 22 Aug 2026. It is a past observation: fares change constantly and must be rechecked with the provider.
What does a typical London to Boston fare look like?
Over 130 days of scans, the median daily lowest one-way fare was €381. Half of the days were cheaper than that, half were more expensive.
How do I know when London to Boston gets cheap?
Install Flare and choose London as your departure city. The app alerts you when a fare from your area drops well below its usual level.