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Cheap flights from Boston to London

The cheapest round trip from Boston to London that travelers found recently is $495 with a carry-on: a $495 fare on SAS, which usually includes a carry-on. It leaves Sat, Apr 24 and comes back Fri, Apr 30.

Live prices for Sat, Apr 24 to Fri, Apr 30

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$495Cheapest round trip, carry-on included (est.)
$756Typical round trip found recently
AprilCheapest month in the next few, from $495
0%Of these fares are nonstop

Cheapest trips travelers found recently

LeaveReturnAirlineAirportsStopsFareCarry-on (est.)TotalLive prices
Sat, Apr 24Fri, Apr 30SASBOS → LHR1 stop$495Included$495Live price
Tue, Nov 10Tue, Nov 17QKBOS → STN2 stops$510Included$510Live price
Thu, Nov 12Sat, Nov 21TAP Air PortugalBOS → STN2 stops$571Included$571Live price
Sat, Nov 7Mon, Nov 16Aer LingusBOS → STN1 stop$618Included$618Live price
Sat, Feb 20Thu, Feb 25TAP Air PortugalBOS → LTN2 stops$742Included$742Live price
Sat, Feb 20Sat, Feb 27FinnairBOS → LTN1 stop$756Included$756Live price
Fri, Oct 23Mon, Oct 26Air CanadaBOS → LHR1 stop$758Included$758Live price
Thu, Nov 19Fri, Nov 27Air CanadaBOS → LHR1 stop$785Included$785Live price
Thu, Dec 24Sun, Dec 27UnitedBOS → LHR1 stop$878Included$878Live price
Thu, Dec 17Wed, Dec 30IcelandairBOS → LTN1 stop$909Included$909Live price

Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.

Cheapest month to fly

MonthCheapest tripFromLive prices
October 2026Fri, Oct 23 to Mon, Oct 26, 3 nights$758Live price
November 2026Tue, Nov 10 to Tue, Nov 17, 7 nights$510Live price
December 2026Thu, Dec 24 to Sun, Dec 27, 3 nights$878Live price
February 2027Sat, Feb 20 to Thu, Feb 25, 5 nights$742Live price
April 2027Sat, Apr 24 to Fri, Apr 30, 6 nights$495Live price

Bag fees on this route

What the airlines flying Boston to London usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.

AirlineCarry-on, each wayChecked bag, each way
Aer LingusIncludedIncluded
Air CanadaIncludedIncluded
FinnairIncludedIncluded
IcelandairIncludedIncluded
QKIncludedIncluded
SASIncludedIncluded
TAP Air PortugalIncludedIncluded
UnitedIncludedIncluded

Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.

How these prices work

These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).

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