AirHint found the following cheapest return flights from Washington (IAD) to Sofia (SOF) in August 2025 (see full year).

Return flights

11 Aug - 25 Aug	Lufthansa
25 Aug - 17 Sep	Turkish Airlines
28 Aug - 11 Sep	Turkish Airlines
27 Aug - 03 Sep	Turkish Airlines
19 Aug - 26 Aug	United
21 Aug - 28 Aug	Scandinavian Airlines
25 Aug - 08 Sep	SWISS
11 Aug - 20 Sep	TAP
16 Aug - 20 Sep	TAP
11 Aug - 21 Sep	TAP
10 Aug - 21 Sep	Turkish Airlines
10 Aug - 20 Sep	Lufthansa
07 Aug - 14 Aug	United
08 Aug - 21 Sep	Turkish Airlines
23 Aug - 30 Aug	United
05 Aug - 12 Aug	United
13 Aug - 20 Aug	United
15 Aug - 22 Aug	United
11 Aug - 18 Aug	United
03 Aug - 10 Aug	United

Also check the deals for one-way flights from Washington to Sofia in August.

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 Washington to Sofia in August from 513€

Return flights