One route, followed properly: London (LHR) to Boston (BOS), return. What follows is the lowest fare our radar has picked up on it and the precise dates behind that number, rather than a headline price with the conditions left out.
We do not post a price and leave it to age. Each fare is re-checked against Skyscanner on a schedule and carries the time it was last confirmed. Not flying from London? We track 39 other departure cities for Boston, listed at the foot of this page.
London → Boston
for 13 Nov – 23 Nov 2026
✓ live-checked 16 hours ago
Check live price on Skyscanner →Price history 29 checks recorded for this route
lowest seen £419 · typical £458 · highest £464 · now £434
The cheapest London to Boston return flight on the radar right now is £434, flying with TAP Air Portugal via one or more connections. It covers departures in November 2026, and every dated link below opens that exact LHR–BOS search on Skyscanner. The price we usually record on this route is £458. Across 29 recorded checks it has ranged between £419 and £464. Our sampling points to November 2026 as the cheapest month to fly London to Boston.
London to Boston flights: common questions
How much is a flight from London to Boston?
The lowest return fare we currently track from London (LHR) to Boston (BOS) is £434. The typical price on this route is £458, so anything near £434 is worth booking quickly. Over 29 recorded checks we have seen it as low as £419 and as high as £464.
Which airline flies from London to Boston at this price?
This £434 fare is with TAP Air Portugal, with at least one connection. The live search lists every carrier serving the route, so you can compare schedules before booking.
Is there a direct flight from London to Boston?
This £434 fare includes at least one connection. If you need a non-stop London to Boston flight, open the live search and apply the direct filter there.
When is the cheapest time to fly from London to Boston?
Our price sampling points to November 2026 as the cheapest departure month on this route. The dated links on this page cover November 2026.
Is the £434 London to Boston fare still available?
We last confirmed this £434 fare against live Skyscanner availability 16 hours ago. Deal fares move within days, so the Check live price button re-runs the exact search and shows today's number rather than a cached one.
How do I book this London to Boston deal?
Pick a date pair above or press Check live price. That opens the exact LHR–BOS search on Skyscanner, where you book directly with the airline or agent. TravelFree does not sell tickets, adds no booking fee and does not mark the price up.
Every London to Boston price on this page comes from a real bookable quote and is re-checked automatically. TravelFree takes no commission from you and never marks a fare up.
Cheap fares do not hang around. If this one has already gone, nudge the dates either way by a day or two; London to Boston is usually still decent value around the same window.