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

Return flights

14 Sep - 19 Sep	Icelandair
30 Sep - 07 Oct	Icelandair
05 Sep - 12 Sep	Icelandair
02 Sep - 19 Sep	Icelandair
19 Sep - 26 Sep	Icelandair
09 Sep - 16 Sep	British Airways	direct
05 Sep - 08 Sep	Spirit Airlines
03 Sep - 10 Sep	British Airways	direct
23 Sep - 30 Sep	British Airways
25 Sep - 03 Oct	Icelandair
11 Sep - 18 Sep	British Airways	direct
25 Sep - 02 Oct	Icelandair
01 Sep - 08 Sep	British Airways
28 Sep - 12 Oct	Delta
27 Sep - 04 Oct	British Airways

Also check the deals for one-way flights from Pittsburgh 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 Pittsburgh to London in September from $507

Return flights