Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Qatar to Connecticut as you normally would.
DOH stands for Doha Hamad Intl Airport, while BDL stands for Hartford Bradley Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Tweed-New Haven Airport (HVN) are other airports near this flight route and their unique identifiers/IATA codes.