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

Return flights

09 Sep - 16 Sep	Lufthansa
03 Sep - 10 Sep	British Airways
24 Sep - 01 Oct	British Airways
30 Sep - 07 Oct	British Airways
19 Sep - 26 Sep	British Airways
21 Sep - 28 Sep	British Airways
11 Sep - 18 Sep	British Airways
06 Sep - 13 Sep	Air Canada
01 Sep - 10 Sep	British Airways
17 Sep - 24 Sep	British Airways
13 Sep - 20 Sep	British Airways
27 Sep - 04 Oct	British Airways
01 Sep - 08 Sep	British Airways

Also check the deals for one-way flights from Jacksonville 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 Jacksonville to London in September from 415€

Return flights