RER UZAR21

RER

Boissy-Saint-LégerCergy le Haut

Passages not confirmedTimes reported by the data source. Passages are not confirmed.

Historical average delay — home ranking

+0 min

Average of available delays per run over the 30 days before calculation, with equal weight for each eligible run. This is not the current delay.

Runs used: 7. Calculated on: 9/11/2026, 1:00:25 AM (Europe/Paris).

This average can be available without a complete route. The route statistics below use only recorded routes with their stops.

Calculation window: 8/12/2026, 1:00:25 AM – 9/11/2026, 1:00:25 AM (Europe/Paris).

Runs in the window: 8
Events confirmed by the source: 0
Events predicted by the source: 1
Unknown event type: 6
Cancelled runs, excluded: 0
No usable delay, excluded: 1

Latest source timestamp: 9/10/2026, 8:56:19 AM (Europe/Paris).

Runs are identified within each source. Identities across sources are kept separate without a proven match. Exclusions can overlap.

Latest available run: these times are historical.

Stops on the latest run

Boissy-Saint-Léger
Departure
Scheduled time07:41
Predicted by the source07:41(0′)
Sucy-en-Brie - Bonneuil-sur-Marne
Arrival
Scheduled time07:43
Predicted by the source07:43(0′)
Departure
Scheduled time07:43
Predicted by the source07:44(+1′)
La Varenne Saint-Hilaire - Chennevières-sur-Marne
Arrival
Scheduled time07:46
Predicted by the source07:46(0′)
Departure
Scheduled time07:46
Predicted by the source07:47(+1′)
Champigny
Arrival
Scheduled time07:48
Predicted by the source07:48(0′)
Departure
Scheduled time07:49
Predicted by the source07:49(0′)
Le Parc de Saint-Maur RER
Arrival
Scheduled time07:50
Predicted by the source07:51(+1′)
Departure
Scheduled time07:51
Predicted by the source07:52(+1′)
Saint-Maur-des-Fossés - Créteil
Arrival
Scheduled time07:52
Predicted by the source07:53(+1′)
Departure
Scheduled time07:53
Predicted by the source07:54(+1′)
Joinville-le-Pont
Arrival
Scheduled time07:55
Predicted by the source07:55(0′)
Departure
Scheduled time07:55
Predicted by the source07:56(+1′)
Nogent-sur-Marne
Arrival
Scheduled time07:57
Predicted by the source07:58(+1′)
Departure
Scheduled time07:58
Predicted by the source07:59(+1′)
Fontenay-sous-Bois
Arrival
Scheduled time07:59
Predicted by the source08:00(+1′)
Departure
Scheduled time08:00
Predicted by the source08:01(+1′)
Vincennes
Arrival
Scheduled time08:02
Predicted by the source08:03(+1′)
Departure
Scheduled time08:03
Predicted by the source08:06(+3′)
Nation
Arrival
Scheduled time08:06
Predicted by the source08:08(+2′)
Departure
Scheduled time08:06
Predicted by the source08:09(+3′)
Paris Gare de Lyon
Arrival
Scheduled time08:09
Predicted by the source08:11(+2′)
Departure
Scheduled time08:10
Predicted by the source08:12(+2′)
Châtelet les Halles
Arrival
Scheduled time08:12
Predicted by the source08:14(+2′)
Departure
Scheduled time08:13
Predicted by the source08:16(+3′)
Auber
Arrival
Scheduled time08:15
Predicted by the source08:17(+2′)
Departure
Scheduled time08:16
Predicted by the source08:19(+3′)
Charles-de-Gaulle Étoile
Arrival
Scheduled time08:19
Predicted by the source08:21(+2′)
Departure
Scheduled time08:19
Predicted by the source08:22(+3′)
La Grande Arche de la Défense
Arrival
Scheduled time08:23
Predicted by the source08:25(+2′)
Departure
Scheduled time08:24
Predicted by the source08:26(+2′)
Nanterre Préfecture - RER
Arrival
Scheduled time08:26
Predicted by the source08:27(+1′)
Departure
Scheduled time08:28
Predicted by the source08:30(+2′)
Houilles - Carrières-sur-Seine
Arrival
Scheduled time08:32
Predicted by the source08:33(+1′)
Departure
Scheduled time08:32
Predicted by the source08:33(+1′)
Sartrouville
Arrival
Scheduled time08:35
Predicted by the source08:36(+1′)
Departure
Scheduled time08:36
Predicted by the source08:37(+1′)
Maisons-Laffitte
Arrival
Scheduled time08:37
Predicted by the source08:38(+1′)
Departure
Scheduled time08:38
Predicted by the source08:38(0′)
Achères Ville
Arrival
Scheduled time08:43
Predicted by the source08:44(+1′)
Departure
Scheduled time08:44
Predicted by the source08:44(0′)
Conflans Fin d'Oise
Arrival
Scheduled time08:46
Predicted by the source08:46(0′)
Departure
Scheduled time08:47
Predicted by the source08:47(0′)
Neuville Université
Arrival
Scheduled time08:50
Predicted by the source08:50(0′)
Departure
Scheduled time08:50
Predicted by the source08:50(0′)
Cergy Préfecture
Arrival
Scheduled time08:53
Predicted by the source08:53(0′)
Departure
Scheduled time08:54
Predicted by the source08:54(0′)
Cergy Saint-Christophe
Arrival
Scheduled time08:58
Predicted by the source08:57(-1′)
Departure
Scheduled time08:58
Predicted by the source08:58(0′)
Cergy le Haut
Arrival
Scheduled time09:01
Predicted by the source09:01(0′)

Punctuality of recorded routes

Reported delays per run with a complete route; separate from the ranking sample. A predicted delay does not confirm a passage.

runs reported on time—

average delay+0.7 min

max delay+9 min

runs reported8

stops26

Delay values

DateDelay (min)

2026-08-270.08

2026-08-282.84

2026-08-310.3076923076923077

2026-09-03-0.19230769230769232

2026-09-070.11538461538461539

2026-09-080.19230769230769232

2026-09-090.9615384615384616

2026-09-101.1538461538461537

Typical schedule

Stops and times of RER UZAR21 from Boissy-Saint-Léger to Cergy le Haut on a typical weekday. Actual times may vary.

StopArrivalDeparture

Boissy-Saint-Léger—07:41

Sucy-en-Brie - Bonneuil-sur-Marne07:4307:43

La Varenne Saint-Hilaire - Chennevières-sur-Marne07:4607:46

Champigny07:4807:49

Le Parc de Saint-Maur RER07:5007:51

Saint-Maur-des-Fossés - Créteil07:5207:53

Joinville-le-Pont07:5507:55

Nogent-sur-Marne07:5707:58

Fontenay-sous-Bois07:5908:00

Vincennes08:0208:03

Nation08:0608:06

Paris Gare de Lyon08:0908:10

Châtelet les Halles08:1208:13

Auber08:1508:16

Charles-de-Gaulle Étoile08:1908:19

La Grande Arche de la Défense08:2308:24

Nanterre Préfecture - RER08:2608:28

Houilles - Carrières-sur-Seine08:3208:32

Sartrouville08:3508:36

Maisons-Laffitte08:3708:38

Achères Ville08:4308:44

Conflans Fin d'Oise08:4608:47

Neuville Université08:5008:50

Cergy Préfecture08:5308:54

Cergy Saint-Christophe08:5808:58

Cergy le Haut09:01—

Frequently asked questions

What time does RER UZAR21 depart?

RER UZAR21 departs from Boissy-Saint-Léger at 07:41 (typical schedule from reported times). Actual times may vary.

How many stops does RER UZAR21 make?

RER UZAR21 connects Boissy-Saint-Léger to Cergy le Haut with 26 stops.

Is RER UZAR21 on time?

Not enough reported runs yet to establish punctuality.

Other trains on this line

Live status and delays for the other trains serving the same stations.

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