Cheap flights from Key West to Boston from £143
Trusted by millions
Kiwi.com Guarantee for stress-free travel
One search, all the best deals
Explore flight deals to Boston
Not happy with the results? Try some of our useful filters
Search by stops
- Nonstop
- Up to 1 stop
- Up to 2 stops
Search by carrier
Search by price
Search by departure date
Not happy with the results? Try some of our useful filters
Search by stops
- Nonstop
- Up to 1 stop
- Up to 2 stops
Search by carrier
Search by price
Search by departure date
How much do flights to Boston cost?
Cheapest one-way trip | £143 |
|---|---|
Cheapest round-trip | £321 |
Average round-trip | £375 |
Includes rare itinerary | |
Most popular airline | JetBlue Airways |
Getting from Boston's airport to the city center
Fastest options: Blue Line subway or taxi. Best value: MBTA Blue Line and Silver Line bus.
Transport Option | Typical Time | Typical Cost | Frequency | Best For |
|---|---|---|---|---|
10-15 min | $2.40; CharlieCard fare | every 5–10 min (traffic dependent) | budget travelers | |
15-25 min | $0; free from airport to South Station | every 8–15 min (traffic dependent) | free ride to South Station | |
7-15 min | $15 – $22; varies by operator and destination | on-demand during operating hours (traffic dependent) | scenic harbor crossing | |
15-35 min | $25 – $45; metered; includes tunnel tolls and airport fee | on-demand 24/7 (traffic dependent) | door-to-door convenience | |
15-35 min | $20 – $50; surge pricing may apply | on-demand 24/7 (traffic dependent) | app-based booking | |
15-35 min | $50 – $100; pre-booked; varies by provider | by reservation (traffic dependent) | groups or business travelers | |
15-40 min | $40 – $100; daily rate; parking extra in downtown | on-demand (traffic dependent) | exploring beyond Boston |
Notes:
- Prices in USD; table created in 2025 and subject to change.
- The Silver Line SL1 is free when traveling from the airport to South Station; fare applies in the opposite direction.
- Free shuttle buses connect all airport terminals to the Blue Line Airport station and the rental car center.
- Taxi fares include a $2.75 airport fee and tunnel tolls; traffic can significantly affect journey times.
- We recommend checking official transport websites for your travel planning.
Updated: December 2025
Key info about flying to Boston
Check-in for a flight from Key West to Boston
| Name | Carrier code | IATA Code | Passport needed during booking |
|---|---|---|---|
| JetBlue Airways | JBU | B6 | No |
| United Airlines | UAL | UA | No |
| Allegiant Air | AAY | G4 | No |
| BREEZE | MX | No | |
| Frontier Airlines | FFT | F9 | No |
Online check-in is not available for these airlines.
Weather in Boston
Average Weather
| Month | Average monthly max temperature | Average monthly min temperature |
| January | 1°C | -4°C |
| February | 3°C | -4°C |
| March | 7°C | 0°C |
| April | 12°C | 5°C |
| May | 18°C | 10°C |
| June | 23°C | 15°C |
| July | 27°C | 19°C |
| August | 27°C | 18°C |
| September | 22°C | 14°C |
| October | 16°C | 9°C |
| November | 10°C | 3°C |
| December | 5°C | 0°C |
14 day forecast
Frequently asked questions
Planning a trip? Thanks to our Virtual Interlining algorithm, we offer billions of route combinations between any origin and destination in the world by plane. Find the cheapest routes and best deals, as well as the best dates to travel.
Explore alternative trips
Flights from Key West
Flights to Boston
Popular routes
Airports near Key West
Airports near Boston
Download our app