Hiya Adam, and welcome to planDisney. Hondo Onaka will be very happy to hear you can spare some time at Disney's Hollywood Studios and specifically
Star Wars: Galaxy's Edge before you head back over the pond.
It is quite quirky but
European and
UK & Ireland Disney websites do not allow for single-day ticket purchases. Once you hit US soil you can
purchase a 1-Day Main Entrance ticket either online or by downloading the
My Disney Experience Mobile app. Once downloaded create an account if you do not already have one, check to make sure a
Theme Park Reservation is available, and purchase your ticket. You may also purchase tickets at any ticket window or at the
Disney Ticket Center at Disney Springs. Please check that a Theme Park Reservation for Disney's Hollywood Studios is available before you purchase your ticket. Tickets are non-refundable and non-transferable.
planDisney Pro Tip: If you find that the lines are long then consider purchasing
Disney Genie+ for the day. It will be worth it if you are trying to get as much done as possible before you head across the Atlantic. Star Wars: Rise of the Resistance is known at times to have over 120-minute wait in the Standy queue. It will be worth it to spend a few extra dollars to join the Resistance by purchasing an Individual Lightning Lane.
Thank you for stopping by and I hope your visit in September is packed with pixie dust and galactic adventure before you head home.
Adam, enjoy making many Magical Memories.
~Jason