Is it safe to travel after 30 days of EVLT with inflammation is still there?

If you have seen your doctor recently and your ultrasound shows only inflammation I would consider it safe for you to fly.  Inflammation at 30 days following the procedure is completely normal and should be expected.  For a flight that long, I would recommend wearing your stockings and walking up and down the aisle once or twice during the flight. 

You are very safe travelling one month after EVLA. Wear compression hose, walk, stay hydrated and move your legs on flights for increased safety.  

Thirty days post ablation should be fine.  I typically recommend no flying for a week after vein treatments.  I always recommend wearing compression when flying and I also recommend walking when able and doing calf raises when you are in your seat and staying well hydrated as all the above will lower your risk for a blood clot while traveling.