AirHint found the following cheapest return flights from Raleigh-durham (RDU) to London (LHR) in September 2025 (see full year).

Return flights

10 Sep - 24 Sep	Spirit Airlines
22 Sep - 30 Sep	jetBlue
02 Sep - 10 Sep	jetBlue
26 Sep - 05 Oct	Spirit Airlines
26 Sep - 10 Oct	jetBlue
12 Sep - 30 Sep	jetBlue
13 Sep - 27 Sep	jetBlue
11 Sep - 29 Sep	jetBlue
13 Sep - 20 Sep	Icelandair
23 Sep - 30 Sep	Icelandair
05 Sep - 12 Sep	Icelandair
23 Sep - 30 Sep	British Airways	direct
28 Sep - 05 Oct	British Airways	direct
26 Sep - 10 Oct	American Airlines	direct
26 Sep - 05 Oct	British Airways	direct

Also check the deals for one-way flights from Raleigh-durham 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 Raleigh-durham to London in September from $491

Return flights