Are there any hotels with a 24h check-in option in Vilnius, Lithuania?

Almost all hotels have a check out between 10am-12pm and a check-in time between 2pm and 4pm and they use the time in between to clean and refit the rooms.

The only exception are so-called "day use" rooms where you book a room for a certain time in the day, but this is pretty rare and I didn't see anything in Vilnius.

Some options:

1. Ask for an "early check in". Some hotels allow this but it's hit or miss and sometimes you have to pay extra. 9am is unlikely to fly though.
2. Just pay for an extra day. You can certainly check in at 9am, you just need to pay for that arrival day.
3. Ask the hotel to store your luggage until check in time. Most hotels will do this, some do charge for it.

If you can consider dropping your standards, hostels regularily offer this kind of service.

I have been in quite a lot of hostels in eastern Europe over the years, and have yet to find one where 24-hour check in (and access to your room/bed) wasn't offered by default.

Yes, it's not the feel and calm of your own furnished room in a hotel, but better than wandering around at 2 am without a bed if need be.

Depending on the hostel it might be possible to get an entire room (some offer those, for others it might be in an ok price range for you to rent out an entire 4 bed room or so to have your peace).

Maybe for the first night after a flight it's an ok compromise for you. Do make sure they have lockers if you travel with any valuable equipment (laptops etc.)

Vilnius City Hotel states on their site that you can check in for free two hour before normal check-in time, as long as you book directly with them. I believe that is at noon, since I made a test reservation, and it was stated that check-in is from 2 pm.

From https://www.vilniuscityhotel.com/reservation/

"4. Early check-in or late check-out.

Our direct customers can always ask for an extra two hours before check-in or check-out. It’s free."

Another option is Grand Hotel Kempinski. They have what you asked for - a 24-hour check-in option. Meaning check-in anytime, you can stay 24 hours. Valid Sunday to Thursday. Terms apply.

"Take advantage of our “24 – Like Never Before” offer, which allows flexible check-in and check-out times for stays from Sunday to Thursday. Choose any desired check-in time and check out at exactly the same hour the next day.*"

In case that doesn't work they have another option. The package "Weekends at Kempinski"

The offer includes:

"Early check in from 10:00 o'clock Late check out until 15:00 o'clock ...'

https://www.kempinski.com/en/vilnius/grand-hotel-kempinski/