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

Return flights

11 Sep - 14 Sep	Spirit Airlines
08 Sep - 17 Sep	Spirit Airlines
21 Sep - 30 Sep	Icelandair
04 Sep - 11 Sep	Icelandair
07 Sep - 14 Sep	Icelandair
08 Sep - 14 Sep	Icelandair
22 Sep - 26 Sep	Icelandair
19 Sep - 28 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
02 Sep - 07 Sep	Icelandair
30 Sep - 07 Oct	British Airways	direct
26 Sep - 03 Oct	jetBlue
25 Sep - 02 Oct	United
25 Sep - 02 Oct	British Airways	direct
26 Sep - 03 Oct	Iberia	direct
27 Sep - 04 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 $508

Return flights