FlyerTalk Forums - View Single Post - Anyone used UA SFO-MEX then MX for a domestic flight?
Old May 21, 2010, 8:48 am
  #3  
El Cochinito
 
Join Date: Jul 2000
Location: Sacramento, California, USA
Posts: 2,974
As indicated by the previous poster you will clear Mexican immigration at MEX. Customs inspection, which is random, takes place at CUN. You won't see your luggage until Cancun.

Connecting passengers at MEX after clearing Mexican immigration are routed back airside (there are plenty of Spanish/English signs directing you the right way). Just prior to re-entering the terminal you'll go through a security checkpoint with a WTMD and X-ray machine.
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