AirHint found the following cheapest return flights from Basel (BSL) to Sofia (SOF) in April 2026 (see full year).

Return flights

09 Apr - 10 Apr	Wizz Air	direct
10 Apr - 19 Apr	Wizz Air
09 Apr - 12 Apr	Wizz Air	direct
10 Apr - 26 Apr	Wizz Air
02 Apr - 05 Apr	Wizz Air	direct
10 Apr - 12 Apr	Wizz Air	direct
02 Apr - 11 Apr	Austrian Airlines
09 Apr - 18 Apr	Wizz Air
03 Apr - 12 Apr	Austrian Airlines
02 Apr - 10 Apr	Wizz Air	direct

Also check the deals for one-way flights from Basel to Sofia in April.

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 Basel to Sofia in April from 132€

Return flights