All those SIA is the best airlines are based on opinions gathered from passenger surveys. If you really need to get somewhere on time, you want to fly with an airline that meets scheduled arrivals & departures. The best airline is KLM they have the fewest delays of 11.47%
https://www.bloomberg.com/news/articles/2017-01-09/the-best-and-worst-airlines-in-the-world
The Worst 10 International Airlines of 2016
10. Hainan Airlines – 30.3 percent
9. Korean Air – 31.74 percent
8. Air China – 32.73 percent
7. Hong Kong Airlines – 33.42 percent
6. China Eastern Airlines – 35.8 percent
5. Asiana Airlines – 37.46 percent
4. Philippine Airlines – 38.33 percent
3. Air India – 38.71 percent
2. Icelandair – 41.05 percent
1. El Al – 56 percent
The Best 10 International Airlines of 2016
10. Qantas – 15.7 percent
9. TAM Linhas Aéreas – 14.93 percent
8. Delta Air Lines – 14.83 percent
7. Singapore Airlines – 14.55 percent
6. ANA – 14.46 percent
5. Austrian – 14.26 percent
4. Qatar Airways – 13.66 percent
3. JAL – 12.2 percent
2. Iberia – 11.82 percent
1. KLM – 11.47 percent
https://www.bloomberg.com/news/articles/2017-01-09/the-best-and-worst-airlines-in-the-world
The Worst 10 International Airlines of 2016
10. Hainan Airlines – 30.3 percent
9. Korean Air – 31.74 percent
8. Air China – 32.73 percent
7. Hong Kong Airlines – 33.42 percent
6. China Eastern Airlines – 35.8 percent
5. Asiana Airlines – 37.46 percent
4. Philippine Airlines – 38.33 percent
3. Air India – 38.71 percent
2. Icelandair – 41.05 percent
1. El Al – 56 percent
The Best 10 International Airlines of 2016
10. Qantas – 15.7 percent
9. TAM Linhas Aéreas – 14.93 percent
8. Delta Air Lines – 14.83 percent
7. Singapore Airlines – 14.55 percent
6. ANA – 14.46 percent
5. Austrian – 14.26 percent
4. Qatar Airways – 13.66 percent
3. JAL – 12.2 percent
2. Iberia – 11.82 percent
1. KLM – 11.47 percent