The writer believes that:

Choices:
A. not enough information
B. The line isn't too long
C. you should save money by waiting in line
D. Online tickets are worth skipping the line
Online tickets are worth skipping the line
As I mentioned in my previous post on Sacré-Coeur, one of the other places I didn’t get a chance to see when I was in Paris last summer was the catacombs so I wanted to be sure to fit in a visit this time around.
Long Queue vs Online Tickets
You can either wait in line to get in or buy tickets online for specific time slots to bypass the line. Wait times can be anywhere from 30 minutes to 3+ hours and in the summer time, it’s common to wait for hours. I definitely recommend buying a ticket online. Keep in mind that they have a limited number of tickets for each time slot, so don’t wait too long to buy or you may be stuck in that loooooong line. We got quite a few less-then-friendly looks from those in the line when we bypassed the entire queue and went right in. C’est la vie (insert Gallic shrug here).
For some inexplicable reason, the site says you must print your tickets if you buy them online. Given that most visitors to the catacombs are tourists with limited or no access to a printer, this seems particularly silly, but what can you do? Luckily, we were in a hotel with a small business center so we printed our tickets there.
Online tickets cost quite a bit more (27€ compared to 12€ for adults and 10€ for those age 26 or under). Totally worth it if that works with your budget. Online tickets also come with an audio guide. If you buy tickets at the door, the guide is an extra 5€.
It’s a nice cool 14°C (57°F) down there, a lovely break from the hot summer weather above. It is damp in places and the ground can be slippery so watch your step as you walk.