Cheapest return flights from Boston to Sofia in September from 334€

AirHint found the following cheapest return flights from Boston (BOS) to Sofia (SOF) in September 2025 (see full year).

Return flights

09 Sep - 16 Sep Lufthansa
10 Sep - 15 Oct Lufthansa
24 Sep - 09 Oct Austrian Airlines
23 Sep - 14 Oct Lufthansa
15 Sep - 29 Sep Lufthansa
11 Sep - 15 Sep Lufthansa
05 Sep - 19 Sep Lufthansa
25 Sep - 09 Oct SWISS
06 Sep - 11 Oct Air Canada
05 Sep - 05 Oct Lufthansa
04 Sep - 05 Oct Lufthansa

Also check the deals for one-way flights from Boston to Sofia in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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