Magic Kingdom ride reliability

1. 1Walt Disney World Railroad - Frontierland29d 11h lost · 1 breakdown · down on 60 of 60 days 0%
2. 2Jingle Cruise25d 19h lost · 4 breakdowns · down on 60 of 60 days 11.5%
3. 3Walt Disney World Railroad - Main Street, U.S.A.17d 21h lost · 25 breakdowns · down on 59 of 60 days 39.2%
4. 4Walt Disney World Railroad - Fantasyland17d 20h lost · 25 breakdowns · down on 58 of 60 days 39.2%
5. 5Main Street Vehicles7d 13h lost · 37 breakdowns · down on 57 of 60 days 76%
6. 6Tiana's Bayou Adventure5d 17h lost · 22 breakdowns · down on 60 of 60 days 81.1%
7. 7Jungle Cruise4d 5h lost · 17 breakdowns · down on 60 of 60 days 86.1%
8. 8Big Thunder Mountain Railroad2d 21h lost · 32 breakdowns · down on 59 of 60 days 90.3%
9. 9Pirates of the Caribbean1d 22h lost · 20 breakdowns · down on 58 of 60 days 93.6%
10. 10Seven Dwarfs Mine Train1d 19h lost · 34 breakdowns · down on 38 of 60 days 94%
11. 11The Many Adventures of Winnie the Pooh1d 15h lost · 50 breakdowns · down on 37 of 60 days 94.6%
12. 12Peter Pan's Flight1d 13h lost · 23 breakdowns · down on 40 of 60 days 94.8%
13. 13Space Mountain1d 9h lost · 24 breakdowns · down on 28 of 60 days 95.3%
14. 14Haunted Mansion1d 7h lost · 20 breakdowns · down on 60 of 60 days 95.5%
15. 15Buzz Lightyear’s Space Ranger Spin1d 1h lost · 22 breakdowns · down on 25 of 60 days 96.4%
16. 16Prince Charming Regal Carrousel1d 3h lost · 41 breakdowns · down on 43 of 60 days 96.5%
17. 17TRON Lightcycle / Run21h 55m lost · 21 breakdowns · down on 53 of 60 days 96.8%
18. 18The Barnstormer22h 37m lost · 20 breakdowns · down on 19 of 60 days 96.9%
19. 19"it's a small world"15h 59m lost · 15 breakdowns · down on 16 of 60 days 97.9%
20. 20Tomorrowland Transit Authority PeopleMover14h 0m lost · 18 breakdowns · down on 26 of 60 days 98%
21. 21Astro Orbiter13h 36m lost · 17 breakdowns · down on 17 of 60 days 98.1%
22. 22The Magic Carpets of Aladdin13h 28m lost · 10 breakdowns · down on 57 of 60 days 98.1%
23. 23Under the Sea - Journey of The Little Mermaid13h 12m lost · 14 breakdowns · down on 26 of 60 days 98.1%
24. 24Tomorrowland Speedway12h 11m lost · 12 breakdowns · down on 14 of 60 days 98.3%
25. 25Dumbo the Flying Elephant9h 44m lost · 9 breakdowns · down on 12 of 60 days 98.7%
26. 26Mad Tea Party6h 5m lost · 12 breakdowns · down on 16 of 60 days 99.1%

Breakdowns cluster at 4pm, with 74 of the 538 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 317 rides simply were not running at opening, which is a late start rather than a fault and is counted separately. The other 7 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 11 Oct, when 27.6% of the park's ride hours were lost and 27 of 27 rides went down at some point.