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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.
Dulles recommends arriving at the airport 2 1/2 to 3 hours before departure time for an international flight. I tend to leave myself 2 1/2 hours if my airline has allowed me to check in on-line, because then I only have to queue in the shorter, faster line to check my luggage and get my passport vetted.