Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Doha to La Rochelle as you normally would.
DOH and LRH are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. DOH to LRH refers to a flight route from Doha Hamad Intl Airport to La Rochelle Laleu Airport.