Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Londonderry to Belfast as you normally would.
Londonderry Eglinton (LDY) is the airport you will fly out of if you book a flight from Londonderry to Belfast. You should not have trouble finding flights to Belfast from Eglinton; the airport handles an average of 0 outbound flights to Belfast per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Londonderry airport to Belfast. It is only a 6.7 mi journey to Eglinton (LDY) from Londonderry’s city centre.
At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Londonderry and Belfast for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.