| Show |
Episode |
Air date |
Week
rank |
Rating/
Share |
18-49
rating/Share |
Viewers
(millions) |
| 1 |
"Phoenix Auditions" |
January 13, 2009 |
2 |
15.8 / 23 |
11.7 / 28 |
30.424 |
| 2 |
"Kansas City Auditions" |
January 14, 2009 |
3 |
16.4 / 25 |
11.8 / 30 |
30.322 |
| 3 |
"San Francisco Auditions" |
January 20, 2009 |
2 |
12.1 / 18 |
9.0 / 22 |
22.773 |
| 4 |
"Louisville Auditions" |
January 21, 2009 |
1 |
14.3 / 22 |
9.8 / 24 |
25.897 |
| 5 |
"Jacksonville Auditions" |
January 27, 2009 |
4 |
13.7 / 20 |
9.6 / 24 |
25.539 |
| 6 |
"Salt Lake City Auditions" |
January 28, 2009 |
3 |
15.0 / 23 |
10.1 / 25 |
27.364 |
| 7 |
"New York & San Juan Auditions" |
January 29, 2009 |
5 |
13.6 / 21 |
9.3 / 25 |
24.613 |
| 8 |
"Hollywood Round, Part 1" |
February 3, 2009 |
1 |
14.7 / 22 |
10.0 / 25 |
26.601 |
| 9 |
"Hollywood Round, Part 2" |
February 4, 2009 |
2 |
14.8 / 23 |
9.9 / 27 |
26.384 |
| 10 |
"Hollywood Round, Part 3" |
February 10, 2009 |
2 |
13.9 / 21 |
9.2 |
24.941 |
| 11 |
"Hollywood Round, Part 4" |
February 11, 2009 |
1 |
14.0 / 22 |
9.5 |
24.825 |
| 12 |
"Group 1 Semi-finalists Perform" |
February 17, 2009 |
2 |
14.3 / 21 |
9.6 |
25.374 |
| 13 |
"Group 1 Results Show" |
February 18, 2009 |
3 |
14.1 / 22 |
9.0 / 24 |
24.790 |
| 14 |
"Group 2 Semi-finalists Perform" |
February 25, 2009 |
1 |
13.8 / 21 |
9.1 |
24.541 |
| 15 |
"Group 2 Results Show" |
February 26, 2009 |
2 |
11.9 / 19 |
7.1 / 19 |
20.889 |
| 16 |
"Group 3 Semi-finalists Perform" |
March 3, 2009 |
1 |
13.8 / 21 |
9.0 |
24.309 |
| 17 |
"Group 3 Results Show" |
March 4, 2009 |
2 |
13.1 / 21 |
7.8 / 22 |
22.776 |
| 18 |
"Wild Card Round" |
March 5, 2009 |
3 |
12.2 / 19 |
7.6 / 20 |
21.498 |
| 19 |
"Top 13 Perform" |
March 10, 2009 |
1 |
14.6 / 23 |
9.5 |
25.767 |
| 20 |
"Top 13 Results"" |
March 11, 2009 |
2 |
14.6 / 22 |
9.1 / 22 |
25.547 |
| 21 |
"Top 11 Perform" |
March 17, 2009 |
2 |
12.3 / 19 |
8.1 / 21 |
21.886 |
| 22 |
"Top 11 Results" |
March 18, 2009 |
1 |
13.7 / 21 |
8.7 |
23.705 |
| 23 |
"Top 10 Perform" |
March 25, 2009 |
1 |
14.7 / 23 |
9.3 |
26.025 |
| 24 |
"Top 10 Results" |
March 26, 2009 |
2 |
13.2 / 21 |
7.7 |
23.102 |
| 25 |
"Top 9 Perform" |
March 31, 2009 |
1 |
13.7 / 21 |
8.9 |
24.410 |
| 26 |
"Top 9 Results" |
April 1, 2009 |
2 |
14.2 / 22 |
8.4 / 20 |
24.342 |
| 27 |
"Top 8 Perform" |
April 7, 2009 |
2 |
13.1 / 21 |
8.1 / 22 |
22.813 |
| 28 |
"Top 8 Results" |
April 8, 2009 |
1 |
13.4 / 21 |
8.0 / 20 |
22.976 |
| 29 |
"Top 7 Perform" |
April 14, 2009 |
1 |
13.8 / 21 |
8.2 / 23 |
24.378 |
| 30 |
"Top 7 Results" |
April 15, 2009 |
2 |
14.0 / 22 |
8.0 / 20 |
24.114 |
| 31 |
"Top 7 Redux" |
April 21, 2009 |
1 |
13.9 / 22 |
8.2 |
23.963 |
| 32 |
"Top 7 Redux Results" |
April 22, 2009 |
2 |
14.0 / 22 |
8.3 |
23.947 |
| 33 |
"Top 5 Perform" |
April 28, 2009 |
1 |
13.5 / 21 |
8.1 |
23.261 |
| 34 |
"Top 5 Results" |
April 29, 2009 |
2 |
13.2 / 20 |
7.7 / 19 |
22.369 |
| 35 |
"Top 4 Perform" |
May 5, 2009 |
1 |
13.4 / 21 |
8.3 |
23.414 |
| 36 |
"Top 4 Results" |
May 6, 2009 |
2 |
13.7 / 21 |
8.3 / 20 |
23.574 |
| 37 |
"Top 3 Perform" |
May 12, 2009 |
2 |
13.0 / 22 |
8.0 |
22.712 |
| 38 |
"Top 3 Results" |
May 13, 2009 |
1 |
14.0 / 21 |
8.7 / 21 |
24.670 |
| 39 |
"Top 2 Perform" |
May 19, 2009 |
2 |
13.5 / 21 |
8.6 |
23.822 |
| 40 |
"Season 8 Finale" |
May 20, 2009 |
1 |
16.1 / 27 |
10.0 |
28.838 |
|