Cheapest return flights from London to Shannon in September from $125

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

Return flights

01 Sep - 03 Sep Aer Lingus direct
02 Sep - 03 Sep Aer Lingus direct
09 Sep - 12 Sep Aer Lingus direct
15 Sep - 22 Sep Aer Lingus direct
17 Sep - 24 Sep Aer Lingus direct
23 Sep - 25 Sep Aer Lingus direct
17 Sep - 19 Sep Aer Lingus direct
03 Sep - 07 Sep Aer Lingus direct
17 Sep - 21 Sep Aer Lingus direct
10 Sep - 11 Sep Aer Lingus direct
25 Sep - 04 Oct Aer Lingus direct
26 Sep - 04 Oct Aer Lingus direct
27 Sep - 02 Oct Aer Lingus direct

Also check the deals for one-way flights from London to Shannon in September.

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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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