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

Return flights

02 Sep - 09 Sep	jetBlue
03 Sep - 10 Sep	jetBlue
30 Sep - 07 Oct	United
24 Sep - 01 Oct	United
06 Sep - 19 Sep	jetBlue
19 Sep - 30 Sep	Air Canada
19 Sep - 02 Oct	Air Canada
08 Sep - 15 Sep	United
12 Sep - 19 Sep	United
14 Sep - 21 Sep	United
05 Sep - 18 Sep	Spirit Airlines
22 Sep - 29 Sep	British Airways
10 Sep - 20 Sep	United
19 Sep - 01 Oct	Delta
19 Sep - 04 Oct	Air Canada
19 Sep - 03 Oct	Delta
19 Sep - 05 Oct	Air Canada
19 Sep - 01 Oct	British Airways	direct
19 Sep - 02 Oct	British Airways	direct
19 Sep - 03 Oct	British Airways	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 553€

Return flights