I Can't Tell You Why by Eagles first appeared on the Israeli foreign-music chart on 31 Mar 1980, entering at #17. It peaked at #9 on 14 Apr 1980. In total it spent 8 weeks on the chart, last charting on 2 Jun 1980.
| Wk | Date | Pos |
|---|---|---|
| 1 | 31 Mar 1980 | 17 |
| 2 | 14 Apr 1980 | 9 |
| 3 | 28 Apr 1980 | 13 |
| 4 | 5 May 1980 | 17 |
| 5 | 12 May 1980 | 23 |
| 6 | 19 May 1980 | 33 |
| 7 | 26 May 1980 | 38 |
| 8 | 2 Jun 1980 | 40 |