Departing on a Thursday is a good option for securing a great price. You can expect to save up to 124% when planning your travel around this day of the week.
Due to multiple factors, expect to potentially pay more when booking in September. For low rates, October can be a great choice for travel to London. Flights to London from Arcata in October are about $1,104 on average during October, but can be found for as low as $789.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Arcata to London as you normally would.