How can a Canadian citizen travel internationally without jeopardizing their I-485 adjustment of status?

Unless you have a valid H-1B or L-1, traveling without an approved advance parole will result in the abandonment of your adjustment application.

If you leave the U.S. for Canada or anywhere else without the advance parole you will be abandoning your pending I-485 even if you are a Canadian national.

If you have a pending I-485 and you depart the United States, then you must have an advance parole document to be readmitted to the United States. Your I-485 will be denied if you depart the United States without first obtaining an advance parole document.

You MUST apply for I-131, Application for Travel Authorization. We also recommend applying for the Work Authorization as well (I-765). If you leave the country without an approved I-131, USCIS will consider that you withdrew your I-485 application. Do not travel without an approved travel authorization.

If you filed for adjustment status from H-1B or L-1 status then you can travel before receiving advance parole without causing the I-485 to be abandoned. If not, traveling internationally before advance parole is issued will cause the I-485 process to stop.

To avoid abandoning your pending I-485 adjustment of status application, apply for an advance parole document (Form I-131). A valid advance parole document must be received by you before you travel outside the US. You may travel to various countries and come back to the US on a valid advance parole document.