Tap the menu icon ⋮ on the right of the request.
It is the last option in the menu, in red.
The 'Delete request' screen shows the flight and date, and whether you get a refund. Tap 'Delete request' to confirm.
When you get a refund
We refund a deleted request when nobody has answered it yet, and nobody is answering it at that moment. You get back what you paid: a credit for a regular request, or a Priority Credit for a Priority Request.
Once a request is answered, deleting it does not refund it. If the flight has already departed, any refund has already happened automatically.
To delete several requests at once, use Batch Actions. The same refund rules apply, and the confirmation screen adds up the credits and Priority Credits you get back.
You rarely need to delete a request
You do not need to delete a request just because nobody has answered it. We refund unanswered requests automatically after the flight departs, as explained in When do I get a credit refund for a request?
Deleting a request and posting it again does not get it answered faster. It comes back at the same place in the list of open requests.