Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington Dulles Intl Airport to Lawton as you normally would.
Due to multiple factors, expect to potentially pay more when booking in November. For low rates, August can be a great choice for travel to Lawton. Flights to Lawton from Washington Dulles Intl Airport in August are about $432 on average during August, but can be found for as low as $266.