Can I get Smart Lipo 6 weeks prior to vacation?

I highly recommend you have your surgery after your vacation. Not only will you need to take it easy for at least the first couple of weeks afterward, you should also be close to your surgeon should a complication occur (it's rare, but can happen).

I wouldn't want to sitting in plane for 10 hours with a hard swollen belly. You'll definitely be uncomfortable. If the areas are small, the discomfort level will be less, but it's not the best idea. Ultimately, it's your call. The patient in the photo link below went on a cruise 6 weeks after a mommy makeover that included a mini tummy tuck and breast implants and did well:

SmartLipo, like any elective surgery, requires budgeting enough time to recover. The good news is that with it, especially when done under local anesthesia, recovery is faster than with other methods. However, everyone has a different capacity to recover, different goals, different schedule demands and varying activities. From a physiologic standpoint, you are well healed in a few weeks but will not see the full benefit of the aesthetic improvement. From a practical standpoint, this is elective surgery and the risks, although very low, are not zero so any unanticipated event can interfere with your plans. 

You need to go on vacation, enjoy yourself and your loved ones and then return home for Smartlipo.  Period. Have fun. Dr. Burnett

You should be relatively healed, but will still be a bit swollen in all likelihood. Good luck with you decision to move forward.