| Runda | Tor | Data | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|
| 1 |  St. Petersburg | 2018.03.10 | Tatuus PM-18 - Mazda |  Juncos Racing | |
| 2 | 2018.03.11 | Tatuus PM-18 - Mazda | Juncos Racing | ||
| 3 | Barber | 2018.04.21 | Tatuus PM-18 - Mazda | Exclusive Autosport | |
| 4 | 2018.04.22 | Tatuus PM-18 - Mazda |  RP Motorsport | ||
| 5 | Indianapolis | 2018.05.11 | Tatuus PM-18 - Mazda | RP Motorsport | |
| 6 | 2018.05.12 | Tatuus PM-18 - Mazda | Exclusive Autosport | ||
| 7 | Indianapolis Raceway Park | 2018.05.25 | Tatuus PM-18 - Mazda | Exclusive Autosport | |
| 8 | Road America | 2018.06.23 | Tatuus PM-18 - Mazda | BN Racing | |
| 9 | 2018.06.24 | Tatuus PM-18 - Mazda | BN Racing | ||
| 10 |  Toronto | 2018.07.14 | Tatuus PM-18 - Mazda | Juncos Racing | |
| 11 | 2018.07.15 | Tatuus PM-18 - Mazda | Juncos Racing | ||
| 12 | Mid-Ohio | 2018.07.28 | Tatuus PM-18 - Mazda | Juncos Racing | |
| 13 | 2018.07.29 | Tatuus PM-18 - Mazda | Juncos Racing | ||
| 14 | Gateway | 2018.08.25 | Tatuus PM-18 - Mazda | Juncos Racing | |
| 15 | Portland | 2018.09.01 | Tatuus PM-18 - Mazda | Cape Motorsports | |
| 16 | 2018.09.02 | Tatuus PM-18 - Mazda | BN Racing |
