Cheapest return flights from Cardiff to Belfast in September from $139

AirHint found the following cheapest return flights from Cardiff (CWL) to Belfast (BHD) in September 2025 (see full year).

Return flights

09 Sep - 12 Sep Aer Lingus direct
10 Sep - 12 Sep Aer Lingus direct
29 Sep - 30 Sep Aer Lingus direct
29 Sep - 01 Oct Aer Lingus direct
02 Sep - 03 Sep Aer Lingus direct
03 Sep - 04 Sep Aer Lingus direct
02 Sep - 12 Sep Aer Lingus direct
10 Sep - 15 Sep Aer Lingus direct
04 Sep - 11 Sep Aer Lingus direct
28 Sep - 30 Sep Aer Lingus direct
23 Sep - 25 Sep Aer Lingus direct

Also check the deals for one-way flights from Cardiff to Belfast in September.

Skyscanner

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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