Travelling can be quite the hassle and can definitely take a toll on your look. For those long trips, my go-to style is low maintenance and chic. Here's an example of something I would wear for a long plane ride or any trip.
The flats are comfortable and perfect for having to run to catch a plane or train. And if you'll be sitting for a while leggings are a great basic to have. Plus they're warm which is perfect for over air-conditioned planes!
Wearing a cute camisole is an ideal way to dress up an otherwise low maintenance look so when you get to wherever you're going, you don't look too touristy!
Also, remember to wear glasses so your eyes don't get too dry (particularly if you're not used to wearing contact lenses on planes), bring a large tote to fit all your travel essentials and wear your hair in an easy and put together style. Happy travelling!