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

Return flights

25 Aug - 09 Sep	Austrian Airlines
08 Aug - 09 Sep	LOT
25 Aug - 08 Sep	United
30 Aug - 13 Sep	FrenchBee
31 Aug - 07 Sep	SWISS
24 Aug - 03 Sep	Lufthansa
08 Aug - 08 Sep	LOT
07 Aug - 21 Aug	Air Canada
11 Aug - 25 Aug	Air Canada
18 Aug - 24 Aug	TAP
24 Aug - 31 Aug	Air Canada
13 Aug - 31 Aug	Austrian Airlines
08 Aug - 25 Aug	Air Canada
08 Aug - 18 Aug	Air Canada
07 Aug - 18 Aug	FrenchBee
02 Aug - 05 Aug	LOT
14 Aug - 22 Aug	United

Also check the deals for one-way flights from Newark 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 Newark to Sofia in August from $405

Return flights