Going on a short plane ride (1.5 hrs). 24 weeks into uncomplicated pregnancy. am i okay to fly?

Yes, if O.K. with OB: Yes if it is O.K. with your treating OB MD. Many airlines restrict flying to pregnant women beyond 7 months gestation for liability reasons in the event of premature labor.

Most likely: I don't know all of your health history, so I can't say with 100% confidence. In general though a short plane ride isn't an issue for most pregnant women, though there may be a few exceptions.