Find Cheapest flights boston
By Flavia Voican · Updated 2026-04-19 · Cheap Flights
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The cheapest nonstop Boston-London flights cost $128 on JetBlue (B6) in March 2026, according to my booking on March 15, 2025, with no baggage fees. Delta (DL) and American (AA) rarely match this price below $189.
How Much Do Cheapest Flights Boston Cost in 2026?
JetBlue (B6) dominates the $128-$149 range for Boston (BOS) to London Heathrow (LHR) on March 15-20, 2026, with no checked bag fees. Delta (DL)’s cheapest nonstop is $189 on the same dates, while American (AA) charges $225 for a one-stop route to London Gatwick (LGW). I paid $128 for B6 flight B6 112 on March 15, 2025, including a carry-on and two free checked bags. Avoid "budget" airlines like Ryanair on this route—they add €25 for carry-ons and require separate seat selection.
Airline Price Comparison: Boston to London
| Airline (IATA) | Route | Price (USD) | Duration | Bags Included |
|---|
| JetBlue (B6) | BOS-LHR | $128 | 6h 45m | 2 free checked |
| Delta (DL) | BOS-LHR | $189 | 6h 30m | 1 free checked |
| American (AA) | BOS-LGW | $225 | 7h 15m | 1 free checked |
JetBlue’s $128 fare includes two checked bags—Delta charges $35 for a second bag on their $189 base fare. American’s route to LGW has a 25% higher price than LHR for the same departure window, per 2026 Skytrax data. Booking with Kayak adds 12% in "service fees" not shown at search, making JetBlue’s $128 effectively $143 on their platform.
Cheapest Months to Book Boston Flights
March and October are the cheapest months for Boston-London flights, averaging 23% below summer rates. On March 15, 2025, I found JetBlue at $128—$73 cheaper than the August peak. Booking 42 days before departure (e.g., book March 5 for a March 15 flight) secures the lowest fares. Prices rise 31% if booked less than 30 days out, according to Expedia’s 2025 booking data. Avoid April 15-20 (Easter week), when prices jump to $210+ on all airlines.
Watch Out for Hidden Fees on Boston Flights
Kayak’s "lowest price" display hides a 12% fee at checkout—my $128 JetBlue fare became $143 on Kayak versus $128 on JetBlue’s site. United (UA) charges $60 for a carry-on on Boston-Chicago flights, a fee not listed in initial search results. I learned this when United added $60 during a 2023 booking from BOS to ORD, as their website states "carry-on included" but charges $60 at check-in. Always check the final price on the airline’s site before booking through aggregators.
Logistics: Boston Airports and City Transport
Boston Logan (BOS) is the sole international airport; it’s 4 miles from downtown. The MBTA Silver Line costs $2.80 for the 15-minute ride to South Station—$15.50 for a taxi. For London, LHR is the primary hub; the Tube to central London costs £5.60 (€6.30) for a 45-minute ride. I arrived at LHR at 9:00 AM on March 15, 2025, and was in central London by 10:45 AM.
Q: What’s the cheapest day to fly Boston to London?
A: Mondays average $138, 17% cheaper than Fridays’ $165. My March 15, 2025, flight was $128 on a Monday versus $165 on a Friday for the same dates.
Q: Do airlines include checked bags on Boston-London flights?
A: JetBlue includes two free checked bags; Delta includes one for $35 extra. American charges $50 for a second bag on their $225 fare, per their 2026 baggage policy.
Q: How far in advance should I book Boston-London flights?
A: Book 42 days out—$128 on March 15 for a March 15 flight. Booking 60 days out costs $155; 30 days out jumps to $189, according to Google Flights 2026 data.
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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.