I saw an infographic this month saying that jet lag can affect seizures and trigger one.
I've flown on a plane without problems, but I will tell you that day got hazy because our flight was delayed and airplanes were trying to keep up so they were really speeding on through to catch up with all the missed time. All the jet lag made me feel so sick and I got an insane headache. We also didn't eat before the flight - we were a bit excited about the trip and didn't feel all that hungry. That whole day could've been a trigger fest for many reasons, but thankfully I didn't have a seizure. I can say, though, I have never been on a plane since or again and I hate flying. It felt like a one and done for me.
It depends how your body acts. I think if I would've had a good, full night's sleep, a good meal, and plenty of water to drink I would've been better off.