AirHint found the following cheapest return flights from New Orleans (MSY) to London (LHR) in September 2025 (see full year).

Return flights

17 Sep - 22 Sep	Spirit Airlines
23 Sep - 30 Sep	United
24 Sep - 24 Oct	United
04 Sep - 27 Sep	Spirit Airlines
01 Sep - 27 Sep	Spirit Airlines
30 Sep - 25 Oct	jetBlue
11 Sep - 16 Sep	jetBlue
29 Sep - 06 Oct	United
04 Sep - 11 Sep	Spirit Airlines
25 Sep - 02 Oct	United
10 Sep - 24 Sep	jetBlue
21 Sep - 28 Sep	United
25 Sep - 18 Oct	jetBlue
18 Sep - 11 Oct	jetBlue
06 Sep - 27 Sep	Spirit Airlines
14 Sep - 27 Sep	Spirit Airlines
27 Sep - 04 Oct	United
19 Sep - 02 Oct	Spirit Airlines
19 Sep - 11 Oct	Spirit Airlines
19 Sep - 02 Oct	American Airlines	direct

Also check the deals for one-way flights from New Orleans to London 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 New Orleans to London in September from $687

Return flights