Booking your flights from Houston, Cheap Flights Find fares as Low Cost Flights To Houston when you book your flight with the official site. Flight prices vary depending on what time of year and days of the week you fly from. For one-way trips, September is usually the cheapest month to fly, while October is usually the least expensive time for round-trips. To make sure you get the best deal, set your target price, destination and travel dates, and if we find cheap flights from Houston that meet or exceed your target price, we'll help you. Will send an alert.