France's detention trap: longer stays, fewer deportations
In France, migrants are being held in detention centers twice as long as five years ago — even as deportation rates fall. A policy unraveling its own logic.
At a Glance
The average detention period in France’s administrative holding centers reached just over 33 days in 2025, up from 16 days in 2020, according to the annual report of five nonprofit organizations working inside these facilities.
The deportation success rate has fallen to 36.1% in 2025, down from the previous year — meaning nearly two in three detainees are eventually released without being expelled.
Of the 16,467 people detained in 2025, roughly 5,000 — or 30.4% — were Algerian nationals, a concentration that may reflect the persistent diplomatic friction between Paris and Algiers.
Detained longer, deported less
France’s network of centres de rétention administrative — administrative detention centers where undocumented migrants are held pending deportation — is keeping people inside for twice as long as it did five years ago. In 2025, the average stay exceeded 33 days; in 2020, it was 16. That doubling has been documented by five organizations with daily on-the-ground access to these facilities: Forum Réfugiés, France Terre d’Asile, Groupe SOS Solidarités, la Cimade, and Solidarité Mayotte.
What makes this trend particularly striking is its apparent disconnect from results. The deportation rate dropped to 36.1% in 2025, down from the prior year. The longer detention runs, the data suggests, the less it seems to deliver — a pattern that could point to a growing mismatch between the profiles being detained and France’s actual capacity, diplomatic and logistical, to carry out removals.
The Algeria problem at the center of the system
Nearly one in three people held in these facilities in 2025 was Algerian. That figure — 30.4% of 16,467 total detainees — is not incidental. France and Algeria have maintained strained diplomatic relations for years, and those tensions directly affect the consular process: obtaining the emergency travel documents required to physically remove someone requires cooperation from their country’s consulate. Without it, detention extends mechanically, up to the legal maximum under French law, which was tightened in 2023 to allow for longer holding periods.
Justine Girard, who oversees detention policy for la Cimade — one of France’s longest-standing migrant rights organizations — points directly to this dynamic: when bilateral relations between France and a detainee’s home country are difficult, the person continues to be held. What her organization objects to, she says, is precisely that continued detention in cases where removal has effectively become impossible.
Preventive imprisonment by another name?
Vincent Beaugrand, chief executive of France Terre d’Asile, goes further. He describes what he sees as a “misuse” of the detention system — one that functions less as a deportation tool and more as a form of preemptive confinement. The people being placed in detention, he argues, are not those whose removal is actually achievable in the near term.
That critique carries analytical weight. France’s detention centers were designed as a short-term procedural mechanism — a holding space while expulsion orders are enforced, not a deterrent in their own right. If the data confirms that stays are lengthening while success rates fall, it is plausible that the system is now operating in a more symbolic register: projecting firmness on migration without the diplomatic conditions to back it up. That hypothesis is not established by any official source — but the numbers are consistent with it. The total number of people placed in detention edged up from 16,228 in 2024 to 16,467 in 2025, even as the share of successful removals contracted.
The bottom line
France is not alone in facing this tension. Across the European Union, member states have moved toward longer and broader use of administrative detention as a migration management tool — even as return rates have stagnated or declined. The underlying question is one that European governments have generally avoided answering in public:
At what point does a deportation policy with a 36% success rate stop being a deportation policy?
For France, the answer may be forced sooner than expected. Municipal elections in 2026 will put immigration policy front and center in towns and cities across the country. Whether the government chooses to defend the current system on its own terms — or recalibrate it toward fewer detentions and faster, more targeted removals — is a choice that the numbers in this report make harder to defer.
Sources: Franceinfo · Annual report of French nonprofit organizations operating in administrative detention centers (2025)