If you are in the United States as a lawful permanent resident or conditional permanent resident and you wish to travel outside the U.S. for an extended period of time, you may apply for a re-entry permit. You must be physically present in the United States when you file the re-entry permit and complete the biometric services requirement, if applicable.
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If you are a permanent resident, you can travel outside the United States. Temporary or brief travel usually does not affect your permanent resident status. However, if you plan on leaving for more than 6 months, it is a good idea to have a re-entry permit. If the government determines that you did not intend to make the United States your permanent home, they may decide that you have abandoned your permanent resident status. A general guide used is whether you have been absent from the United States for more than 6 months.
How much does it cost to file a I-131 form?