| Runda | Tor | Data | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|
| 1 |  St. Petersburg | 2018.03.10 | Dallara IL-15 - Mazda-AER | Andretti Autosport | |
| 2 | 2018.03.11 | Dallara IL-15 - Mazda-AER | Belardi Auto Racing | ||
| 3 | Barber | 2018.04.21 | Dallara IL-15 - Mazda-AER | Andretti Autosport | |
| 4 | 2018.04.22 | Dallara IL-15 - Mazda-AER | Andretti Autosport | ||
| 5 | Indianapolis | 2018.05.11 | Dallara IL-15 - Mazda-AER | Andretti Steinbrenner Racing | |
| 6 | 2018.05.12 | Dallara IL-15 - Mazda-AER | Andretti Steinbrenner Racing | ||
| 7 | Indianapolis | 2018.05.25 | |||
| 8 | Road America | 2018.06.23 | |||
| 9 | 2018.06.24 | ||||
| 10 | Iowa | 2018.07.08 | |||
| 11 |  Toronto | 2018.07.14 | |||
| 12 | 2018.07.15 | ||||
| 13 | Mid-Ohio | 2018.07.28 | |||
| 14 | Mid-Ohio | 2018.07.29 | |||
| 15 | Gateway | 2018.08.25 | |||
| 16 | Portland | 2018.09.01 | |||
| 17 | 2018.09.02 |
