AirHint found the following cheapest return flights from Indianapolis (IND) to Lisbon (LIS) in August 2025 (see full year).

Return flights

29 Aug - 05 Sep	Spirit Airlines
17 Aug - 24 Aug	Air Canada
16 Aug - 24 Aug	Air Canada
08 Aug - 22 Aug	Iberia
21 Aug - 28 Aug	United
08 Aug - 15 Aug	British Airways
18 Aug - 25 Aug	United
13 Aug - 20 Aug	United
15 Aug - 22 Aug	United
25 Aug - 01 Sep	United
05 Aug - 12 Aug	United
24 Aug - 31 Aug	United
27 Aug - 03 Sep	United
30 Aug - 06 Sep	United

Also check the deals for one-way flights from Indianapolis to Lisbon 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 Indianapolis to Lisbon in August from $697

Return flights