Traveling post op in PRE-Operation Weight Loss Surgery Q&A Posted June 9, 2013 I flew 5 days post op, approx 4 hours, then a 3 hour layover and another hour long flight. I was fine. I bought a few drinks after security (Water, sugar free iced tea) and since I was still in the "sipping" stage, I didn't need anything extra from the airline. On other flights, I have noticed the US has muscle milk after security so you can buy Protein there. I had no problem getting my liquids in. I didn't find travelling post op that different than flying any other time in my life. You may need help with your carry on as you shouldn't be lifting anything heavy. My seatbelt was fine. I flew wearing sweatpants and didn't have a problem with it digging in or anything.