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

Return flights

30 Sep - 07 Oct	Icelandair
09 Sep - 16 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
05 Sep - 12 Sep	Icelandair
03 Sep - 10 Sep	British Airways	direct
24 Sep - 01 Oct	British Airways
11 Sep - 18 Sep	British Airways	direct
05 Sep - 12 Sep	British Airways	direct
07 Sep - 14 Sep	British Airways	direct
21 Sep - 28 Sep	British Airways
13 Sep - 20 Sep	British Airways	direct
18 Sep - 25 Sep	Icelandair
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 448€

Return flights