1 - Borussia Dortmund (GER): 81.365 ≈100%
2 - Bayern München (GER): 75.000 ≈100%
3 - Interazionale (ITA): 73.555 ≈ 100%
4 - Manchester United (ENG): 73.488 ≈ 99%
5 - Milan (ITA): 72.362 ≈95%
6 - Real Madrid (SPA): 68.588 ≈ 81%
7 - Olympique de Marseille (FRA): 63.621 ≈ 65%
8 - West Ham (ENG): 62.468 ≈ 100%
9 - Rome (ITA): 62.439 ≈86%
10 - Tottenham (ENG): 61.726 ≈ 99%
11 - Arsenal (ENG): 60.113 ≈99%
12 - Benfica (POR): 59.594 ≈91%
13 - Atlético de Madri (ESP): 58.857 ≈86%
14 - Celtic (SCO): 58.553 ≈ 96%
15 - Flamengo (BRA): 56.743 ≈72%
16 - Eintracht Frankfurt (GER): 55.220 ≈95%
17 - Stuttgart: 53.300 ≈99%
18 - Manchester City (ENG): 53.311 ≈ 100%
19 - Borussia Mönchengladbach (GER): 53.255 ≈88%
20 - Newcastle (ENG): 52.106 ≈ 100%
Possibly based on ticket sales, many people buy a season ticket but don’t attend every home game. But the seat is still “sold”
But if you watch live at the stadium (or even on TV) you can tell the stadium is actually full, the number of season ticket holders who don’t show up is likely negligible in the grand scheme.