Due to multiple factors, expect to potentially pay more when booking in June. For low rates, May can be a great choice for travel to London. Flights to London from Wilkes-Barre in May are about $1,198 on average during May, but can be found for as low as $740.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Wilkes-Barre to London as you normally would.