Explore the most affordable Finnair flight options available from London to Boston. Find the lowest fares with prices last updated on 5 November 2026.
Thu 24/1217:00 -
Nonstop7h 40m
Fri 8/118:45 -
Nonstop6h 40m
Deal found 3/11£485
Thu 10/1211:25 -
1 stop12h 00m
Wed 30/1219:10 -
Nonstop6h 50m
Deal found 2/11£509
Fri 18/1211:25 -
1 stop12h 00m
Fri 1/110:51 -
1 stop18h 09m
Deal found 1/11£513
Best Finnair flights from London to Boston
Discover carefully curated Finnair flight deals from London to Boston that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 November 2026.
Fri 18/1211:25 -
1 stop12h 00m
Fri 1/110:51 -
1 stop18h 09m
Deal found 1/11£513
Wed 9/1213:10 -
Nonstop7h 35m
Tue 15/1219:15 -
Nonstop6h 45m
Deal found 4/11£524
Sat 9/113:10 -
Nonstop7h 45m
Sat 23/118:45 -
Nonstop6h 40m
Deal found 1/11£535
Direct Finnair flights from London to Boston
Explore direct Finnair flight options from London to Boston based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 November 2026.
Thu 24/1217:00 -
Nonstop7h 40m
Fri 8/118:45 -
Nonstop6h 40m
Deal found 3/11£485
Sat 12/1217:00 -
Nonstop7h 40m
Sat 16/121:30 -
Nonstop6h 45m
Deal found 4/11£520
Thu 3/1211:40 -
Nonstop7h 40m
Wed 9/1221:30 -
Nonstop6h 45m
Deal found 3/11£521
Last-minute Finnair flights from London to Boston
Discover last-minute Finnair flight deals from London to Boston. Data last updated 5 November 2026 and is based on user searches.
Thu 24/1217:00 -
Nonstop7h 40m
Fri 8/118:45 -
Nonstop6h 40m
Deal found 3/11£485
Thu 10/1211:25 -
1 stop12h 00m
Wed 30/1219:10 -
Nonstop6h 50m
Deal found 2/11£509
Fri 18/1211:25 -
1 stop12h 00m
Fri 1/110:51 -
1 stop18h 09m
Deal found 1/11£513
One-way Finnair flights to Boston
Search for one-way Finnair flight options to Boston. Find affordable one-way fares based on user searches. Data last updated 5 November 2026.
Thu 24/1211:40 -
Nonstop7h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 4/11£428
Mon 18/117:00 -
Nonstop7h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£431
Fri 29/117:00 -
Nonstop7h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£442
Can I get a flight from London to Boston on Finnair for under £520?
There are 3 flights available on Finnair from London to Boston for under £520. These prices can change based on many factors including date and time. To find LON-BOS flight prices for your dates, click here.
Find detailed information about Finnair flights from London to Boston. Explore the options provided by Finnair to plan your journey from London to Boston. Data last updated 5 November 2026.
Which month is the cheapest to fly Economy class from London to Boston?
For Economy class flights, the cheapest month to fly this route is January. The most expensive months are June and August.
Weekly Finnair flight availability from London to Boston
The most Finnair flights from LON to BOS are scheduled on a Wednesday (4 on average). You will have fewer Finnair flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).
Rainfall in Boston by month
Plan your trip to Boston by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Boston ranges from 78.0 - 101.0 inches per month. March is typically the wettest month, when rainfall can reach 101.0 mm. July is typically the driest time to visit Boston when rainfall is around 78.0 mm.
Temperature in Boston by month
Plan your trip to Boston by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Boston, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).
When is the best time to book a flight to Boston with Finnair?
The best time to book a flight to Boston with Finnair is 29 days before departure. On average, fares are higher if you book 9 days before departure.
Best time to book a flight from London to Boston
Have a flexible travel schedule? Discover the best time to fly to Boston from London with our price prediction graph.
LON-BOS
LHR-BOS
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
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Fly from London to Boston on another airline
Consider alternative airlines that service the Boston area. Flight routes are based on user searches made on Cheapflights and were last updated on 5 November 2026.
Browse through other Finnair flights departing from London. Flight routes are based on user searches made on Cheapflights and were last updated on 5 November 2026.
If Boston is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on 5 November 2026.
Browse through some of the most popular routes that Finnair offers at this time. Flights are based on user searches made on Cheapflights and were last updated on 5 November 2026.
Read reviews and see what other travellers are saying about their experiences with Finnair. Get insights from real passengers regarding the airline's services, customer satisfaction, and overall travel experience. Use these reviews to inform your decision when choosing Finnair for your next flight. Reviews last updated 5 November 2026.
The flight from Helsinki to Toronto was very cramped. No leg space and no room to even walk. Very bad experience
8.0
Very Good|Jul 2026
Very limited food provided. Limited drinks, lights out for 10 of 12.30 flights. Very few staff.
2.0
Poor|Jun 2026
Lost our luggage and took two days to get it back. Ruined the trip.
10.0
Wonderful|Jun 2026
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
10.0
Wonderful|May 2026
Positive
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