Middlebury Institute of International Studies at Monterey
Can I travel outside the US while my OPT application is pending?

You should wait for your OPT to be approved and be in receipt of the actual card before traveling outside of the U.S.  If you must leave the country while your OPT application is pending, then you should be sure to carry your receipt notice from USCIS as well as a letter of support from the Office of International Services.  If you do  not have a valid visa and your OPT application is still pending, it is strongly recommended that you wait for the approval before applying for a new visa.