We’re flying to Schiphol (from USA on Delta, connecting flight is KLM Cityhopper) in September, connecting to Florence. Any reason to be concerned with a 90 minute layover/connection time? (if flight is on time)
If booked on one ticket? No. Schiphol is efficient. Those short connections are offered because the airlines believe they work, and do not want to waste your precious time.
In Schiphol you will only pass through immigration. If your flight is imminent you can skip the line.
Shouldn't be a problem at all. I find the airport pleasant and easy. I would generally consider just 45 minutes (on one ticket) enough there because it is so easy.
I am presuming that you are arriving from the States which is a different situation that EU citizen transfering through AMS.
First, I would take the 90 minute connection if i could find no other longer connection that was less than 4 hours. I can still run when I need to. I would also get a seat as far forward in the arriving plane as possible.
I have been through Amsterdam more times than I can count.
I have done it in 45 minutes from arrival at the gate to to queing for the next flight and that was pretty much a perfect world scenario.
If your arrival is 45 minutes late, a good chance you will not make it.
It has also taken every bit of 2 hours ... and that was about a year ago.
At times it is smooth and slick and at times it is one of the worst airports I have every been in (second only to LHR and CDG). The consistency of experience just hasnt been there to make me feel comfortable in saying "yes".
I love the lead photo. Pretty much what to expect. https://nltimes.nl/2023/04/02/schiphol-falls-15th-29th-worlds-best-airport-rankings
As Mr. E has noted, it can be enough time and it can not be enough, there are many variables. If you plan ahead (see below), it's probably fine. But I personally would choose a longer layover if you can, especially if you check bags.
You can check your flight on the Schiphol travel planner page to get an idea of the process you'll need to follow when landing. Make sure to double check the gate list to confirm where you're going just after you deplane. Do not make any stops along the way (not even bathroom). When checking in for your AMS flight make sure you ask them to check you in for the Florence flight and get boarding passes if they will give them to you. This will save you a stop at a transfer station. About two weeks ahead of your flight you can use the airport's planner page to see the predicted crowds on your actual travel day. The airport has an app that you can put in your flight info and get notifications, but I found the Delta app was faster on the notifications. You can also look at the historic arrival time for your AMS flight to see if it's typically on time or late, though it doesn't guarantee what will happen on your specific travel day.
KLM has 5 flights a day from AMS to FLR, so even if you did miss it, you should be able to get on the next flight.
When connecting at Schiphol (in the past six months) I noticed a separate line at passport control for passengers with short connection times (usually 25 minutes or less). So even if your flight arrives a little late you would likely have time to make the connection.
Schiphol, as others have mentioned, is an efficient, easy airport to navigate. If given the choice, I'd fly through it before any others. They have, at the passport control, agents who pull out travelers with tight connection times to breeze through. My layovers through Schiphol (from US) are often 90 mins and it has always been plenty of time for me to connect to my next flight (KLM Cityhopper).
Den, about 8 months ago to get in the fast lane people were being told their departure time had to be in the next 30 minutes. I listened twice to make sure I heard correctly. It was a shorter line, but still a line, then a dead run to the gate with hopes they hadn't closed the door yet.
The lack of consistency makes it a terrible experience and the reviews reflect it. But, if it's the cheapest flight, it's where I will be.
Just to reaffirm what others have said above. Schipohl immigration line will have you wait until they call you out when your boarding time is near. Nerve wracking at times, but it has worked for us a few times in the past couple of trips. Juts be prepared.