Book a place on the Aiguille du Midi or Grands Montets cable cars or the Tramway du Mont Blanc. It costs 2€ per person although if you have a Mont Blanc Multi-pass, Season or Annual pass it's free!
Reservations on the Aiguille du Midi can be made in July & August and from February in the winter season. Reservations open 7 days in advance and close 24 hours before travel. It is not possible to make reservation for the current day on line. Whenever you make a reservation, you are booking for a place on a train or cabin for a number of persons at a precise time. This reservation is entirely separate from your ticket: when arriving on the site, you have access to a priority ticket office (the "reservation desk). At this cash desk, you buy the ticket that suits you best (one-way, return,Mont-Blanc Multipass...). So it is possible (and advised) to book your places in advance prior to buying your tickets (on the spot).
You can book online or in person at any of the lift pass offices, as well as at the information point located inside the Aiguille du Midi cable-car station. On the day of travel make sure you are present at the "reservation ticket desks" 20 minutes before your departure. Just give your name and the booked departure time at the desk to retrieve your boarding pass.
Out of the total number of places, only a third is available in the reservation quota. Should the time you wish to book not be available, or if the system tells you that the reservation is full, it is still possible to queue at the ticket desk on the day of your visit. However, it is hard to know in advance how long the waiting line will be (usually a minimum of 20 minutes, up to an hour and a half on peak days).
When you make a reservation, you book your ascent. For the descent, you will be given a number upon arrival at the top. No reservations are possible for the Panoramic Mont-Blanc gondola.
Reservations on the Tramway du Mont Blanc are possible only in July & August; book online.
Reservations for the Grands Montets Cable car (the top section) are possible in winter from 09:55 each day until the end of April. Make your reservation on line with your smart card lift pass. You'll need the number from the card to make the booking and if you're booking for a friend/s you'll need to know their card number/s too. On the day of use, bring the printed confirmation of your booking and the smart card/s; book online.
When the online booking isn't available, you can still book in advance at one of the lift pass offices in resort.