how early to airport for domestic flights
General Arrival Time. In general, the airlines and the Transportation Security Administration recommend that passengers arrive at the airport at least 90 minutes before domestic flights, including those to Hawaii and Puerto Rico. This allows ample time for you to check in for your flight, check baggage and go through security screening. This recommendation refers to the time you actually arrive in the airport terminal, though. If you need to park, return a rental car or ride a shuttle from the airport parking area, include time for that.
According to the results of the study, the best time to book a domestic flight is 54 days (or seven and a half weeks) in advance. For international flights, CheapAir.com generally advises travelers to buy earlier rather than later, but prime booking dates vary by destination. The worst time to get that ticket? At the last minute, as you would expect.