I've flown maaany times on Southwest and other airlines at this weight. The seatbelts are tight, but I've never needed an extension, and I've never had to buy an extra. And you're taller and thinner than me.
But I know you're still going to worry, because no matter how many times everything goes ok for me, I'm still sick with terror before every flight :/


No one else will be thinking about your weight while on a flight to Vegas.