Bridesmaid at 35-36 weeks?

So my friend asked me today to be a bridesmaid in her wedding on September 30th. I am about 4weeks and 3 days along in my pregnancy which would land me right around October 25th as my EDD ( my first ultrasound is on March 17 so I don't know if my EDD is correct) The wedding is in another state so it would be about a 9 hour drive, most of which is through no mans land with no cell service. A flight would be about 1 1/2 hours but I've heard flying is a no no in your last trimester. I want to be there for my friend, but I feel as though I should decline since I am unsure if I will even be able to travel at that point. What do you ladies think?