AirHint found the following cheapest return flights from Chicago (ORD) to Sofia (SOF) in November 2025 (see full year).

Return flights

27 Nov - 11 Dec	Spirit Airlines
10 Nov - 17 Nov	Austrian Airlines
14 Nov - 21 Nov	Lufthansa
07 Nov - 14 Nov	Lufthansa
30 Nov - 16 Dec	Lufthansa
28 Nov - 11 Dec	Lufthansa
14 Nov - 17 Nov	Austrian Airlines
08 Nov - 24 Nov	Austrian Airlines
08 Nov - 25 Nov	Austrian Airlines
14 Nov - 06 Dec	TAP
07 Nov - 21 Nov	Air France
10 Nov - 06 Dec	United
20 Nov - 02 Dec	Spirit Airlines
21 Nov - 13 Dec	Frontier Airlines
24 Nov - 20 Dec	Frontier Airlines

Also check the deals for one-way flights from Chicago to Sofia in November.

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 Chicago to Sofia in November from 491€

Return flights