Which sites actually require a timed slot
The Louvre does not describe its online reservation as mandatory. Its own FAQ says visitors are "advised to book a time-stamped ticket" and that doing so "guarantees admission" for the chosen date and time — language that stops short of making it compulsory, but also warns that a ticket, once bought, is non-changeable and non-refundable. In practice the museum limits how many visitors it admits per slot, so during busy months the online allocation can sell out and same-day counter sales dry up. Book online if you have a date fixed; treat the counter as a fallback, not a plan.
Versailles is stricter. The 2026 ticketing page states the Passport ticket includes "a tour of the Palace with a fixed time slot," and visitors must "enter the Palace in the half hour following the chosen time" — booking is built into the ticket itself, not an optional add-on. There is no palace-only ticket in 2026; the Passport, which also covers the Trianon estate, is the only way in.
Why the Eiffel Tower is a different case
The Eiffel Tower's own site sells tickets "online and on-site at the official rates," and for individual visitors a walk-up purchase remains possible — unlike the Louvre or Versailles, there's no language requiring a booked slot for a single visitor. That changes for groups: from 29 September 2026, groups of more than nine people must book online. For anyone else, booking online still buys certainty rather than a hope that the on-site queue moves before your evening dinner reservation, since access to the summit can also be cut on short notice for weather.
What "closed" actually means for your week
Plan around closing days before you plan around opening hours. The Louvre shuts on Tuesdays; Orsay shuts on Mondays. Because the two never fall on the same day, a traveller with a short stay can put Orsay or Versailles on a Tuesday and the Louvre on a Monday without losing either. The Centre Pompidou needs a different kind of correction: it closed in 2025 for a five-year renovation and will not reopen before 2030, so drop it from a 2026 plan rather than discovering the closure at the door.
A table comparing how the three flagship sites treat booking and closing days:
| Site | Closed | Booking |
|---|---|---|
| Louvre | Tuesdays, 1 Jan, 1 May, 25 Dec | Time-stamped ticket strongly advised, not contractually required |
| Musée d'Orsay | Mondays, 1 May, 25 Dec | Time slot generally required; mandatory on free first Sundays except for pass holders |
| Château de Versailles | Mondays | Fixed time slot built into the Passport ticket |
Who the free first Sunday actually suits
Musée d'Orsay's own admission page states the museum is "free for all" on the first Sunday of the month, but adds that online booking has been required since October 2022, "except for holders of a Carte blanche or a Paris Museum Pass." That combination — free, but slot-limited — suits someone who plans two or three weeks ahead and books the moment slots open, not someone deciding that morning. The Ville de Paris lists a separate and much longer roster of city-run museums (Musée Carnavalet, Petit Palais, Musée Cognacq-Jay and others) with free permanent collections every day of the week, no first-Sunday timing required — a better fit if your visit is spontaneous. On the Ville de Paris list, first-Sunday-only free entry at several major national museums, including the Louvre, no longer applies; that scheme ended years ago, and the Louvre's current free admission is limited to under-18s, EEA residents under 26, and a monthly late evening (first Friday after 6 p.m., excluding July and August).
Where the Paris Museum Pass break-even actually falls
The Paris Museum Pass costs EUR 85 for two days, EUR 105 for four, and EUR 125 for six, according to its own operator site, and grants direct entry — "without going through the checkouts" — at more than 50 participating museums and monuments. Run the arithmetic against 2026 full-price adult tickets: a non-EEA visitor doing the Louvre (EUR 32), Musée d'Orsay (EUR 16), Versailles in high season (EUR 35) and the Arc de Triomphe in high season (EUR 22) already reaches EUR 105 in ticket cost for four sites — more than the two-day pass and close to the four-day price, before counting anything else the pass also covers, such as the Conciergerie or the Sainte-Chapelle. An EEA resident paying the lower EEA rates at the same four sites (EUR 22 + EUR 16 + EUR 32 + EUR 22 = EUR 92) still clears the two-day pass price, though by a slimmer margin, so the pass earns its keep fastest for visitors paying full non-EEA rates and doing three or more paid major sites inside its validity window.
The pass does not remove every queue. At sites running separate timed-entry admission, such as the Louvre and Versailles, a pass holder still needs to reserve an entry slot through that site's own system — the pass buys the right to enter without paying at the counter, not an automatic place in line.
The difference between a booked ticket and a queue-free entry
A booked ticket fixes your admission window and, at sites like Versailles, is the only route in. A "skip the line" or "priority access" product, sold by third parties, generally means a separate, shorter queue at the same entrance — it does not remove the need for a valid ticket for that time slot, and it is not the same product as the museum's own online booking. Buy directly from the venue's own site (louvre.fr, musee-orsay.fr, chateauversailles.fr, toureiffel.paris) whenever that option exists; it is normally cheaper than a resold "skip the line" ticket for the same access.
Before you leave arrivals
Check the specific closing day and booking rule for each site on your list against its own current page before you commit a date to it — hours, prices and free-admission conditions in this article were confirmed on the operators' own sites on 7 September 2026, but ticketing policy for major Paris sites changes at least once a year. If a page you're relying on shows a season or year that has already passed, treat every number on it as unconfirmed.