Discover the Cheapest Return Flights to Thailand with FlightForUS! The time of year you choose to fly significantly impacts the cost. In the low season (June to October), prices drop, offering great value fares. You can even book just a couple of weeks before departure. For more information and bookings, call us at +44-800-054-8309. Plan ahead for high season travel—start your search at least six weeks before departure for the best deals. Let FlightForUS help you secure the cheapest flights to Thailand departing from the United Kingdom!