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

Return flights

19 Sep - 26 Sep	Spirit Airlines
23 Sep - 30 Sep	Air Canada
14 Sep - 08 Oct	Spirit Airlines
29 Sep - 06 Oct	Air France
28 Sep - 06 Oct	KLM
01 Sep - 09 Sep	Delta
16 Sep - 23 Sep	United
08 Sep - 15 Sep	United
22 Sep - 29 Sep	United
02 Sep - 09 Sep	United
06 Sep - 13 Sep	United
10 Sep - 17 Sep	United
04 Sep - 11 Sep	United
28 Sep - 05 Oct	United
25 Sep - 02 Oct	United

Also check the deals for one-way flights from Kansas City 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 Kansas City to Barcelona in September from 439€

Return flights