Common sense for international travel:
When flying all US citizens must present a passport or other approved travel document when entering the US.
When traveling by air you should contact the airport to see what the wait time will be. You might have to go through screening which can take time. Remember that this time does not include navigating through the airport or your baggage pickup. You will need to be sure to make allowances for that to keep from missing your flight.
If you are traveling by land or sea across the border then you must have a document that complies with the Western Hemisphere Travel Initiative such as a passport. more about Traveling Abroad at Quick Reservation
