UFO sightings by place
UFO sightings in Yvelines: 61 reports
SkyUnknown lists 61 UFO sightings in Yvelines, from 1953 to 2025, drawn from official records: GEIPAN (CNES). The busiest year was 1980, with 6 cases.
Of the 61 cases with a conclusion from their source, 67% are explained (with certainty or probably), 30% lack the data to conclude, and 2 remain unidentified. The most frequent identified causes: sky lanterns (10); aircraft (7); balloons (7).
Most frequently named places: Conflans-Sainte-Honorine (6), Plaisir (4), Sartrouville (3), Rambouillet (3), and Fontenay-le-Fleury (2).
- cases
- 61
- unidentified
- 2
- period
- 1953–2025
- source
- 1
Notable cases
The most complete records: account of the sighting, conclusion of the official investigation.
- UnexplainedFebruary 5, 2003
Buchelay
Yvelines, Île-de-France, France
GEIPAN (CNES)
- UnexplainedNovember 15, 1993
Ecquevilly
Yvelines, Île-de-France, France
GEIPAN (CNES)
- Probably explainedJune 22, 2025
Achères
Yvelines, Île-de-France, France
→ Sky lanterns
GEIPAN (CNES)
- ExplainedSeptember 14, 2024
Émancé
Yvelines, Île-de-France, France
→ Aircraft
GEIPAN (CNES)
- Insufficient dataJuly 14, 2024
Maule
Yvelines, Île-de-France, France
GEIPAN (CNES)
- Insufficient dataNovember 15, 2022
Orphin
Yvelines, Île-de-France, France
GEIPAN (CNES)
- ExplainedMarch 7, 2022
Sartrouville
Yvelines, Île-de-France, France
→ Sky lanterns
GEIPAN (CNES)
- ExplainedMay 30, 2020
Saint-Germain-en-Laye
Yvelines, Île-de-France, France
→ Aircraft
GEIPAN (CNES)
- ExplainedMay 8, 2020
Sartrouville
Yvelines, Île-de-France, France
→ Sky lanterns
GEIPAN (CNES)
Other departments in the region
Identified causes
For cases explained with certainty or probably.
All sightings
| Date | Place | Status | Identified cause |
|---|---|---|---|
| June 22, 2025 | Achères · Yvelines | Probably explained | Sky lanterns |
| September 14, 2024 | Émancé · Yvelines | Explained | Aircraft |
| July 14, 2024 | Maule · Yvelines | Insufficient data | |
| November 15, 2022 | Orphin · Yvelines | Insufficient data | |
| March 7, 2022 | Sartrouville · Yvelines | Explained | Sky lanterns |
| May 30, 2020 | Saint-Germain-en-Laye · Yvelines | Explained | Aircraft |
| May 8, 2020 | Sartrouville · Yvelines | Explained | Sky lanterns |
| August 23, 2018 | Houilles · Yvelines | Explained | Balloons |
| July 7, 2018 | Chatou · Yvelines | Explained | Sky lanterns |
| January 28, 2018 | Fontenay-le-Fleury · Yvelines | Probably explained | Drones |
| February 6, 2017 | Magny-les-Hameaux · Yvelines | Probably explained | Aircraft |
| November 29, 2016 | Conflans-Sainte-Honorine · Yvelines | Explained | Reflections and photo artefacts |
| April 12, 2015 | Plaisir · Yvelines | Probably explained | Aircraft |
| December 5, 2014 | Conflans-Sainte-Honorine · Yvelines | Probably explained | Sky lanterns |
| March 9, 2014 | Saint-Rémy-lès-Chevreuse · Yvelines | Probably explained | Meteors and fireballs |
| September 7, 2013 | Poissy · Yvelines | Probably explained | Balloons |
| August 8, 2013 | Noisy-le-Roi · Yvelines | Probably explained | Aircraft |
| July 17, 2013 | Plaisir · Yvelines | Probably explained | Meteors and fireballs |
| April 14, 2013 | Plaisir · Yvelines | Probably explained | Balloons |
| December 2, 2012 | Sartrouville · Yvelines | Probably explained | Sky lanterns |
| July 1, 2012 | Conflans-Sainte-Honorine · Yvelines | Probably explained | Sky lanterns |
| April 15, 2012 | Meulan · Yvelines | Insufficient data | |
| February 4, 2012 | Toussus-le-Noble · Yvelines | Probably explained | Meteors and fireballs |
| January 2, 2012 | Les Clayes-sous-Bois · Yvelines | Insufficient data | |
| October 26, 2011 | Jouars-Pontchartrain · Yvelines | Insufficient data | |
| October 1, 2011 | Carrières-sous-Poissy · Yvelines | Probably explained | Balloons |
| August 10, 2011 | Rambouillet · Yvelines | Probably explained | Aircraft |
| July 10, 2011 | Châteaufort · Yvelines | Explained | Sky lanterns |
| June 26, 2011 | Plaisir · Yvelines | Insufficient data | |
| February 26, 2011 | Louveciennes · Yvelines | Probably explained | Sky lanterns |
| June 13, 2010 | Conflans-Sainte-Honorine · Yvelines | Probably explained | Sky lanterns |
| May 24, 2010 | Beynes · Yvelines | Explained | Planets |
| September 27, 2009 | Poissy · Yvelines | Insufficient data | |
| June 28, 2009 | Élancourt · Yvelines | Insufficient data | |
| February 27, 2009 | Les Mureaux · Yvelines | Probably explained | Aircraft |
| October 2, 2008 | Buc · Yvelines | Explained | |
| August 30, 2008 | Ablis · Yvelines | Explained | Balloons |
| July 31, 2008 | Rambouillet · Yvelines | Insufficient data | |
| April 28, 2008 | Bailly · Yvelines | Explained | Weather and storms |
| July 7, 2007 | Saint-Germain-en-Laye · Yvelines | Explained | Reflections and photo artefacts |
| June 13, 2005 | Vernouillet · Yvelines | Probably explained | |
| February 5, 2003 | Buchelay · Yvelines | Unexplained | |
| March 13, 2001 | Marly-le-Roi · Yvelines | Probably explained | Re-entries |
| January 7, 2000 | Rambouillet · Yvelines | Probably explained | Balloons |
| April 14, 1994 | Châteaufort · Yvelines | Probably explained | |
| November 15, 1993 | Ecquevilly · Yvelines | Unexplained | |
| June 27, 1993 | Le Port-Marly · Yvelines | Probably explained | Balloons |
| July 23, 1991 | Maule · Yvelines | Insufficient data | |
| September 15, 1986 | Vélizy-Villacoublay · Yvelines | Explained | Meteors and fireballs |
| December 25, 1980 | Chevreuse · Yvelines | Explained | Re-entries |
| July 21, 1980 | Fontenay-le-Fleury · Yvelines | Explained | |
| June 6, 1980 | Versailles · Yvelines | Insufficient data | |
| April 5, 1980 | Le Chesnay · Yvelines | Probably explained | Meteors and fireballs |
| April 2, 1980 | Conflans-Sainte-Honorine · Yvelines | Insufficient data | |
| 1980 | Jouars-Pontchartrain · Yvelines | Insufficient data | |
| August 5, 1979 | Achères · Yvelines | Insufficient data | |
| March 8, 1978 | Bennecourt · Yvelines | Insufficient data | |
| September 5, 1977 | Conflans-Sainte-Honorine · Yvelines | Insufficient data | |
| July 2, 1977 | Noisy-le-Roi · Yvelines | Insufficient data | |
| January 8, 1977 | Le Mesnil-le-Roi · Yvelines | Insufficient data | |
| November 3, 1953 | Vélizy-Villacoublay · Yvelines | Explained | Planets |
The figures on this page are computed from the official records cited on each case. See sources and method