SkyUnknown

UFO sightings by place

UFO sightings in Île-de-France: 355 reports

SkyUnknown lists 355 UFO sightings in Île-de-France, from 1953 to 2026, drawn from official records: GEIPAN (CNES). The busiest year was 2009, with 29 cases.

Of the 355 cases with a conclusion from their source, 66% are explained (with certainty or probably), 31% lack the data to conclude, and 9 remain unidentified. The most frequent identified causes: sky lanterns (58); aircraft (37); balloons (35).

Most frequently named places: Cergy (6), Conflans-Sainte-Honorine (6), Athis-Mons (5), Maisons-Alfort (4), and Plaisir (4).

cases
355
unidentified
9
period
1953–2026
source
1
Map of the cases

Notable cases

The most complete records: account of the sighting, conclusion of the official investigation.

By department

Other regions

Sightings by decade

2
1950s1
1960s25
1970s43
1980s19
1990s65
2000s155
2010s45
2020s

Identified causes

For cases explained with certainty or probably.

The 200 most recent sightings (out of 355)

DatePlaceStatus
January 1, 2026Briis-sous-Forges · EssonneExplained
December 19, 2025Samoreau · Seine-et-MarneExplained
September 12, 2025Cachan · Val-de-MarneInsufficient data
August 26, 2025Neuilly-sur-Marne · Seine-Saint-DenisExplained
June 22, 2025Achères · YvelinesProbably explained
June 22, 2025ParisExplained
January 6, 2025Noisy-le-Grand · Seine-Saint-DenisExplained
November 25, 2024Mitry-Mory · Seine-et-MarneProbably explained
September 26, 2024ParisProbably explained
September 19, 2024ParisProbably explained
September 14, 2024Émancé · YvelinesExplained
August 26, 2024Noisy-le-Grand · Seine-Saint-DenisProbably explained
July 21, 2024Saint-Martin-en-Bière · Seine-et-MarneProbably explained
July 14, 2024Maule · YvelinesInsufficient data
February 6, 2024ParisProbably explained
December 11, 2023Boulogne-Billancourt · Hauts-de-SeineExplained
October 29, 2023Fontainebleau · Seine-et-MarneProbably explained
October 9, 2023Nogent-sur-Marne · Val-de-MarneExplained
September 30, 2023Vigneux-sur-Seine · EssonneExplained
July 13, 2023Chaville · Hauts-de-SeineExplained
July 4, 2023Champigny-sur-Marne · Val-de-MarneExplained
June 28, 2023Évry-Courcouronnes · EssonneExplained
June 4, 2023Sceaux · Hauts-de-SeineExplained
April 13, 2023Montmorency · Val-d'OiseExplained
November 15, 2022Orphin · YvelinesInsufficient data
November 7, 2022ParisExplained
November 5, 2022Clamart · Hauts-de-SeineExplained
July 17, 2022Châtillon · Hauts-de-SeineExplained
June 12, 2022Chanteloup-en-Brie · Seine-et-MarneExplained
March 7, 2022Sartrouville · YvelinesExplained
February 17, 2022Palaiseau · EssonneProbably explained
February 15, 2022ParisExplained
November 25, 2021Crégy-lès-Meaux · Seine-et-MarneExplained
November 12, 2021Vulaines-sur-Seine · Seine-et-MarneProbably explained
November 1, 2021Sceaux · Hauts-de-SeineProbably explained
October 14, 2021Garches · Hauts-de-SeineExplained
October 5, 2021Savigny-le-Temple · Seine-et-MarneInsufficient data
September 3, 2021Groslay · Val-d'OiseExplained
December 18, 2020Montmorency · Val-d'OiseExplained
December 9, 2020ParisInsufficient data
November 26, 2020Cergy · Val-d'OiseExplained
October 10, 2020Charenton-le-Pont · Val-de-MarneProbably explained
July 5, 2020Maisons-Alfort · Val-de-MarneExplained
May 30, 2020Saint-Germain-en-Laye · YvelinesExplained
May 8, 2020Sartrouville · YvelinesExplained
August 25, 2019ParisProbably explained
April 28, 2019ParisExplained
August 23, 2018Houilles · YvelinesExplained
August 23, 2018Rueil-Malmaison · Hauts-de-SeineProbably explained
July 7, 2018Chatou · YvelinesExplained
January 28, 2018Fontenay-le-Fleury · YvelinesProbably explained
October 12, 2017Nogent-sur-Marne · Val-de-MarneInsufficient data
August 29, 2017Villejust · EssonneExplained
August 21, 2017ParisExplained
August 4, 2017Émerainville · Seine-et-MarneExplained
June 20, 2017Le Plessis-Trévise · Val-de-MarneProbably explained
June 5, 2017Émerainville · Seine-et-MarneExplained
May 20, 2017ParisProbably explained
April 12, 2017Puiselet-le-Marais · EssonneInsufficient data
February 14, 2017ParisProbably explained
February 6, 2017Magny-les-Hameaux · YvelinesProbably explained
November 29, 2016Conflans-Sainte-Honorine · YvelinesExplained
November 11, 2016Villeneuve-les-Bordes · Seine-et-MarneExplained
November 7, 2016Noisy-le-Sec · Seine-Saint-DenisProbably explained
September 4, 2016Vincennes · Val-de-MarneProbably explained
July 30, 2016Athis-Mons · EssonneProbably explained
June 27, 2016Gagny · Seine-Saint-DenisExplained
April 18, 2016Roissy-en-France · Val-d'OiseProbably explained
January 1, 2016Villemoisson-sur-Orge · EssonneProbably explained
December 24, 2015Asnières-sur-Oise · Val-d'OiseProbably explained
December 24, 2015Évry · EssonneProbably explained
December 7, 2015Limeil-Brévannes · Val-de-MarneProbably explained
September 7, 2015ParisProbably explained
August 29, 2015Châtillon · Hauts-de-SeineProbably explained
August 23, 2015ParisProbably explained
August 10, 2015Saint-Michel-sur-Orge · EssonneExplained
August 7, 2015Évry · EssonneProbably explained
July 6, 2015Clichy · Hauts-de-SeineInsufficient data
June 14, 2015Orly-sur-Morin · Seine-et-MarneProbably explained
June 13, 2015Mennecy · EssonneProbably explained
June 8, 2015Le Perreux-sur-Marne · Val-de-MarneProbably explained
June 6, 2015Clamart · Hauts-de-SeineProbably explained
May 25, 2015Issy-les-Moulineaux · Hauts-de-SeineInsufficient data
May 17, 2015ParisInsufficient data
May 7, 2015Limeil-Brévannes · Val-de-MarneExplained
May 4, 2015ParisProbably explained
May 4, 2015Épinay-sur-Seine · Seine-Saint-DenisProbably explained
April 22, 2015Maisons-Alfort · Val-de-MarneInsufficient data
April 12, 2015Plaisir · YvelinesProbably explained
March 12, 2015Courbevoie · Hauts-de-SeineExplained
March 7, 2015Gouvernes · Seine-et-MarneProbably explained
March 5, 2015Longueville · Seine-et-MarneExplained
March 3, 2015Vaux-le-Pénil · Seine-et-MarneInsufficient data
February 8, 2015Aubervilliers · Seine-Saint-DenisProbably explained
January 13, 2015ParisExplained
December 5, 2014Conflans-Sainte-Honorine · YvelinesProbably explained
October 31, 2014Colombes · Hauts-de-SeineInsufficient data
October 18, 2014Vaux-le-Pénil · Seine-et-MarneProbably explained
October 13, 2014Louan-Villegruis-Fontaine · Seine-et-MarneInsufficient data
September 28, 2014Trilbardou · Seine-et-MarneProbably explained
September 27, 2014Deuil-la-Barre · Val-d'OiseExplained
September 19, 2014Yerres · EssonneProbably explained
September 14, 2014Saint-Maurice · Val-de-MarneExplained
September 7, 2014Provins · Seine-et-MarneProbably explained
August 21, 2014ParisExplained
August 16, 2014Cergy · Val-d'OiseProbably explained
July 31, 2014Claye-Souilly · Seine-et-MarneProbably explained
July 27, 2014Jablines · Seine-et-MarneInsufficient data
July 25, 2014Juvisy-sur-Orge · EssonneProbably explained
June 26, 2014Saint-Mandé · Val-de-MarneInsufficient data
June 23, 2014ParisInsufficient data
June 22, 2014Noisy-le-Grand · Seine-Saint-DenisProbably explained
June 8, 2014Saint-Germain-sur-Morin · Seine-et-MarneExplained
June 7, 2014Asnières-sur-Seine · Hauts-de-SeineProbably explained
May 15, 2014Eaubonne · Val-d'OiseProbably explained
May 12, 2014Évry · EssonneProbably explained
April 20, 2014Treuzy-Levelay · Seine-et-MarneProbably explained
March 15, 2014Osny · Val-d'OiseInsufficient data
March 9, 2014Saint-Rémy-lès-Chevreuse · YvelinesProbably explained
January 9, 2014ParisExplained
January 7, 2014Limeil-Brévannes · Val-de-MarneProbably explained
January 1, 2014Pontoise · Val-d'OiseProbably explained
December 15, 2013ParisExplained
December 10, 2013Maincy · Seine-et-MarneProbably explained
December 9, 2013Romainville · Seine-Saint-DenisProbably explained
November 10, 2013Sceaux · Hauts-de-SeineExplained
November 4, 2013Massy · EssonneProbably explained
October 16, 2013Vienne-en-Arthies · Val-d'OiseProbably explained
September 7, 2013Poissy · YvelinesProbably explained
September 5, 2013Saint-Ouen-l'Aumône · Val-d'OiseProbably explained
August 19, 2013Montfermeil · Seine-Saint-DenisExplained
August 8, 2013Noisy-le-Roi · YvelinesProbably explained
July 25, 2013Cergy · Val-d'OiseProbably explained
July 17, 2013Plaisir · YvelinesProbably explained
June 16, 2013ParisProbably explained
June 9, 2013Quincy-sous-Sénart · EssonneProbably explained
May 10, 2013Nemours · Seine-et-MarneProbably explained
May 7, 2013ParisProbably explained
April 14, 2013Plaisir · YvelinesProbably explained
March 18, 2013Domont · Val-d'OiseExplained
March 15, 2013Chessy · Seine-et-MarneProbably explained
February 11, 2013Villemomble · Seine-Saint-DenisProbably explained
January 1, 2013ParisProbably explained
December 2, 2012Sartrouville · YvelinesProbably explained
December 1, 2012ParisProbably explained
October 5, 2012Dammartin-en-Goële · Seine-et-MarneInsufficient data
September 29, 2012Boulogne-Billancourt · Hauts-de-SeineExplained
September 16, 2012Athis-Mons · EssonneProbably explained
September 15, 2012Yerres · EssonneProbably explained
August 19, 2012Châtenay-Malabry · Hauts-de-SeineProbably explained
August 13, 2012Gagny · Seine-Saint-DenisProbably explained
August 8, 2012ParisProbably explained
July 27, 2012Courbevoie · Hauts-de-SeineProbably explained
July 9, 2012Saint-Maur-des-Fossés · Val-de-MarneProbably explained
July 1, 2012Conflans-Sainte-Honorine · YvelinesProbably explained
June 29, 2012Maffliers · Val-d'OiseUnexplained
June 20, 2012ParisExplained
May 21, 2012Choisy-le-Roi · Val-de-MarneUnexplained
April 15, 2012Meulan · YvelinesInsufficient data
March 23, 2012ParisProbably explained
February 4, 2012Toussus-le-Noble · YvelinesProbably explained
January 27, 2012ParisInsufficient data
January 2, 2012Les Clayes-sous-Bois · YvelinesInsufficient data
December 26, 2011Clamart · Hauts-de-SeineProbably explained
December 20, 2011ParisProbably explained
December 2, 2011ParisInsufficient data
November 6, 2011La Ville-du-Bois · EssonneProbably explained
October 26, 2011Jouars-Pontchartrain · YvelinesInsufficient data
October 20, 2011Fleury-Mérogis · EssonneProbably explained
October 1, 2011Carrières-sous-Poissy · YvelinesProbably explained
September 24, 2011ParisProbably explained
September 3, 2011Juvisy-sur-Orge · EssonneProbably explained
August 10, 2011Rambouillet · YvelinesProbably explained
July 10, 2011Châteaufort · YvelinesExplained
June 27, 2011Maisons-Alfort · Val-de-MarneProbably explained
June 26, 2011Plaisir · YvelinesInsufficient data
May 13, 2011ParisProbably explained
May 10, 2011Bagnolet · Seine-Saint-DenisProbably explained
April 9, 2011Gif-sur-Yvette · EssonneInsufficient data
April 8, 2011Franconville · Val-d'OiseExplained
April 7, 2011ParisProbably explained
March 21, 2011Lieusaint · Seine-et-MarneProbably explained
February 26, 2011Louveciennes · YvelinesProbably explained
February 18, 2011Rentree Atmospherique · EssonneProbably explained
December 5, 2010ParisProbably explained
September 19, 2010ParisProbably explained
September 5, 2010Fontenay-en-Parisis · Val-d'OiseProbably explained
August 31, 2010Vigneux-sur-Seine · EssonneExplained
August 21, 2010La Garenne-Colombes · Hauts-de-SeineProbably explained
July 1, 2010Cergy · Val-d'OiseProbably explained
July 1, 2010Rosny-sous-Bois · Seine-Saint-DenisInsufficient data
June 30, 2010Saint-Maur-des-Fossés · Val-de-MarneInsufficient data
June 26, 2010ParisInsufficient data
June 13, 2010Conflans-Sainte-Honorine · YvelinesProbably explained
June 5, 2010ParisExplained
June 5, 2010Tournan-en-Brie · Seine-et-MarneExplained
June 3, 2010Fontenay-sous-Bois · Val-de-MarneProbably explained
May 24, 2010Beynes · YvelinesExplained
May 23, 2010ParisInsufficient data
January 4, 2010Taverny · Val-d'OiseUnexplained
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The figures on this page are computed from the official records cited on each case. See sources and method