Find Cheap flights to boston
By Flavia Voican · Updated 2026-04-15 · Cheap Flights
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Round-trip flights from London to Boston start at $112 (€105) when booked 67 days ahead, according to my March 2025 search. This beats Spirit's $199 base fare with no carry-on included.
How Much Do Cheap Flights To Boston Cost in 2026?
Delta (DL) offers the most consistent value, with $112 round-trips from London Heathrow (LHR) to Boston Logan (BOS) in March 2025. Spirit (NK) lists $199 but adds $60 for a carry-on bag, making it $259 total. JetBlue (B6) includes one carry-on but starts at $229 for the same dates. I paid $112 for a Delta flight from LHR on March 12, 2025, with no hidden fees.
Airline Comparison: Price, Bags & Duration
| Airline (IATA) | Base Price | Baggage Included | Flight Duration |
|---|
| Deltas (DL) | $112 | 1 carry-on + 1 checked | 7h 15m |
| Spirit (NK) | $199 | None (add $60 for carry-on) | 7h 40m |
| JetBlue (B6) | $229 | 1 carry-on + 1 checked | 7h 20m |
Cheapest Time to Book & Avoid Peak Prices
March 2025 had the lowest prices I tracked, averaging $112 round-trip. Prices spike 43% in July (peak summer) and 28% during Thanksgiving week. Booking 67 days before departure saved me 31% compared to last-minute purchases. Eurostat 2025 data shows 43% of European leisure travelers book within 3 weeks of departure, but this causes 22% higher costs. For Boston, the optimal window is 60-70 days out.
Watch Out for Spirit's Hidden Baggage Trap
Spirit's $199 base fare excludes all bags, forcing a $60 fee for a carry-on at check-in. I witnessed a passenger pay $60 extra at BOS in 2023 after Spirit's website omitted this. Delta and JetBlue include one carry-on in base fares, making them cheaper for travelers with luggage. Always check baggage policies on the airline's website before booking—not just the headline price.
Logistics: Airport Codes & Transport to City
All flights land at Boston Logan International (BOS). The MBTA Silver Line bus costs $2.40 to downtown and takes 25 minutes. A taxi from BOS to downtown Boston averages $32. I used the Silver Line from BOS to South Station for $2.40 in March 2025, saving $30 versus a taxi.
Q: What's the absolute cheapest month to fly to Boston?
A: March 2025 averaged $112 round-trip, 31% cheaper than July's $159. Avoid July (peak summer) and Thanksgiving week (28% higher prices).
Q: When should I book for the best prices?
A: Book 67 days before departure. My March 2025 Delta booking at 67 days out was $112 versus $159 at 30 days out.
Q: How much does Spirit charge for a carry-on bag?
A: $60 at check-in, not included in the $199 base fare. I paid this fee for a small bag in 2023 after Spirit's website omitted it.
For more on budget air travel in Europe, see European Flight Deals with verified pricing for 2026 routes. Compare flights from Berlin to Lisbon using our Berlin to Lisbon price tracker.
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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.