AirHint found the following cheapest return flights from Kansas City (MCI) to Porto (OPO) in August 2025 (see full year).

Return flights

19 Aug - 02 Sep	Air Canada
20 Aug - 27 Aug	SWISS
13 Aug - 20 Aug	Delta
14 Aug - 21 Aug	United
21 Aug - 28 Aug	United
12 Aug - 19 Aug	Delta
18 Aug - 25 Aug	Delta
15 Aug - 22 Aug	Delta
31 Aug - 07 Sep	Spirit Airlines
17 Aug - 24 Aug	Delta
16 Aug - 23 Aug	Delta
11 Aug - 18 Aug	Spirit Airlines
28 Aug - 06 Sep	Spirit Airlines
28 Aug - 04 Sep	Spirit Airlines
30 Aug - 06 Sep	Spirit Airlines
27 Aug - 03 Sep	Spirit Airlines
29 Aug - 05 Sep	Spirit Airlines
25 Aug - 01 Sep	Spirit Airlines

Also check the deals for one-way flights from Kansas City to Porto 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 Kansas City to Porto in August from $736

Return flights