AirHint found the following cheapest return flights from Lille (LIL) to Barcelona (BCN) in September 2025 (see full year).

Return flights

29 Sep - 10 Oct	Volotea	direct
29 Sep - 17 Oct	Volotea	direct
22 Sep - 10 Oct	Volotea	direct
26 Sep - 10 Oct	Volotea	direct
26 Sep - 15 Oct	Volotea	direct
29 Sep - 13 Oct	Volotea	direct
15 Sep - 19 Sep	Volotea	direct
26 Sep - 13 Oct	Volotea	direct
22 Sep - 14 Oct	Volotea
04 Sep - 08 Sep	Ryanair
01 Sep - 08 Sep	Ryanair
22 Sep - 26 Sep	Volotea	direct
12 Sep - 19 Sep	Volotea	direct
22 Sep - 29 Sep	Volotea	direct
05 Sep - 08 Sep	Ryanair
10 Sep - 22 Sep	Volotea
16 Sep - 19 Sep	Ryanair
26 Sep - 28 Sep	Volotea
18 Sep - 01 Oct	Ryanair
30 Sep - 14 Oct	Ryanair

Also check the deals for one-way flights from Lille to Barcelona in September.

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 Lille to Barcelona in September from $68

Return flights