Provided it did not require payment, you can change your previous seat selection at any time through Manage your booking. In the case of paid seat selections, you will only be able to change your selection when you check in online.

If the fare conditions of your ticket permit changes and you decide to change your flight, you can choose an equivalent seat on your new flight. In the case of paid advance seat selections, if there is no equivalent seat available or you change to a cheaper seat, the extra amount paid will not be refunded. If the seat you choose on the new flight is more expensive, you will have to pay the difference. Refunds of paid advance seat selections are only available under certain circumstances. Please check the Advance seat selection page.