Due to multiple factors, expect to potentially pay more when booking in July. For low rates, January can be a great choice for travel to Saint Paul. Flights to Saint Paul from London Southend Airport in January are about £728 on average during January, but can be found for as low as £505.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Southend Airport to Saint Paul as you normally would.