Magic Kingdom ride reliability

1. 1Jingle Cruise29d 11h lost · 1 breakdown · down on 60 of 60 days 0%
2. 2Walt Disney World Railroad - Main Street, U.S.A.16d 16h lost · 62 breakdowns · down on 60 of 60 days 44.4%
3. 3Walt Disney World Railroad - Fantasyland16d 16h lost · 62 breakdowns · down on 60 of 60 days 44.4%
4. 4Main Street Vehicles11d 16h lost · 57 breakdowns · down on 60 of 60 days 62.9%
5. 5Big Thunder Mountain Railroad3d 20h lost · 49 breakdowns · down on 60 of 60 days 87.2%
6. 6Tiana's Bayou Adventure3d 1h lost · 46 breakdowns · down on 60 of 60 days 89.6%
7. 7Seven Dwarfs Mine Train2d 23h lost · 53 breakdowns · down on 50 of 60 days 90.1%
8. 8Jungle Cruise2d 6h lost · 42 breakdowns · down on 60 of 60 days 92.2%
9. 9The Barnstormer2d 0h lost · 44 breakdowns · down on 34 of 60 days 93.3%
10. 10The Many Adventures of Winnie the Pooh2d 0h lost · 60 breakdowns · down on 41 of 60 days 93.4%
11. 11Astro Orbiter1d 22h lost · 36 breakdowns · down on 31 of 60 days 93.6%
12. 12The Magic Carpets of Aladdin1d 18h lost · 33 breakdowns · down on 59 of 60 days 94.1%
13. 13Pirates of the Caribbean1d 16h lost · 20 breakdowns · down on 59 of 60 days 94.4%
14. 14Tomorrowland Speedway1d 14h lost · 31 breakdowns · down on 28 of 60 days 94.7%
15. 15Dumbo the Flying Elephant1d 10h lost · 31 breakdowns · down on 26 of 60 days 95.2%
16. 16Space Mountain1d 9h lost · 27 breakdowns · down on 29 of 60 days 95.4%
17. 17TRON Lightcycle / Run1d 4h lost · 21 breakdowns · down on 57 of 60 days 95.7%
18. 18Peter Pan's Flight1d 6h lost · 18 breakdowns · down on 27 of 60 days 95.8%
19. 19Tomorrowland Transit Authority PeopleMover1d 4h lost · 28 breakdowns · down on 33 of 60 days 96.1%
20. 20Haunted Mansion1d 3h lost · 15 breakdowns · down on 60 of 60 days 96.1%
21. 21Prince Charming Regal Carrousel1d 1h lost · 41 breakdowns · down on 43 of 60 days 96.8%
22. 22Buzz Lightyear’s Space Ranger Spin23h 51m lost · 23 breakdowns · down on 27 of 60 days 96.9%
23. 23Under the Sea - Journey of The Little Mermaid11h 16m lost · 11 breakdowns · down on 27 of 60 days 98.4%
24. 24"it's a small world"8h 19m lost · 8 breakdowns · down on 12 of 60 days 98.9%
25. 25Mad Tea Party5h 59m lost · 11 breakdowns · down on 19 of 60 days 99.1%

Breakdowns cluster at 4pm, with 158 of the 819 closures that started before the park's final hour beginning then - so the ride you most want is safest earlier in the day, not saved for last. A further 271 rides simply were not running at opening, which is a late start rather than a fault and is counted separately. The other 11 closures start in the 10pm hour, when the park is shutting - those are rides finishing their day, not failing, so they are left out here.

The worst day in this window was 23 Aug, when 29.2% of the park's ride hours were lost and 20 of 26 rides went down at some point.