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

Return flights

16 Aug - 26 Aug	Iberia
20 Aug - 03 Sep	Delta
04 Aug - 14 Aug	Delta
06 Aug - 14 Aug	Delta
13 Aug - 20 Aug	British Airways
05 Aug - 12 Aug	British Airways
27 Aug - 03 Sep	British Airways
21 Aug - 28 Aug	Delta
07 Aug - 14 Aug	Delta
15 Aug - 22 Aug	British Airways
17 Aug - 24 Aug	British Airways
11 Aug - 18 Aug	British Airways
20 Aug - 11 Sep	British Airways
31 Aug - 07 Sep	British Airways
29 Aug - 05 Sep	British Airways
25 Aug - 01 Sep	British Airways
28 Aug - 12 Sep	Delta

Also check the deals for one-way flights from Indianapolis to London 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 London in August from 445€

Return flights