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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.
The airlines have a cut-off time of 30 minutes prior to flight time in order to check in (we almost missd it once). To be safe, for domestic flights, we arrive at the airport between 1 hour to 1.5 hours prior flight time, which gives enough time to check in, and get through security lines. For an international flight, I would arrive 2 hours before flight time.