Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast to Knock as you normally would.
Knock Intl (NOC) is the airport you will fly into if you book a flight from Belfast to Knock. You should not have trouble finding flights to Knock Intl from Belfast; the airport handles an average of 0 inbound flights from Belfast per day. You should also have plenty of airline options to choose from since 1 airline has flights to the Knock airport from Belfast. It is only a 9.2 mi journey from Knock Intl (NOC) to Knock’s city centre.