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

Return flights

28 Jul - 30 Aug	SWISS
29 Jul - 30 Aug	SWISS
16 Jul - 30 Jul	Lufthansa
15 Jul - 02 Aug	Lufthansa
30 Jul - 31 Aug	Air Canada
31 Jul - 31 Aug	ITA Airways
26 Jul - 09 Aug	Lufthansa
05 Jul - 23 Aug	Air France

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

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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Cheapest return flights from Boston to Sofia in July from $492

Return flights