| Runda | Tor | Data | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|
| 1 |  St. Petersburg | 2018.03.10 | Dallara DW12 - Honda | Dale Coyne Racing with Vasser-Sullivan | |
| 2 | ISM Raceway | 2018.04.07 | Dallara DW12 - Chevrolet | Team Penske | |
| 3 | Long Beach | 2018.04.15 | Dallara DW12 - Honda | Andretti Autosport | |
| 4 | Barber | 2018.04.22 - 04.23 | Dallara DW12 - Chevrolet | Team Penske | |
| 5 | Indianapolis | 2018.05.12 | Dallara DW12 - Chevrolet | Team Penske | |
| 6 | Indianapolis | 2018.05.25 | Dallara DW12 - Chevrolet | Team Penske | |
| 7 | Belle Isle Park | 2018.06.02 | Dallara DW12 - Honda | Chip Ganassi Racing | |
| 8 | 2018.06.03 | Dallara DW12 - Honda | Andretti Autosport | ||
| 9 | Texas | 2018.06.09 | Dallara DW12 - Honda | Chip Ganassi Racing | |
| 10 | Road America | 2018.06.24 | Dallara DW12 - Chevrolet | Team Penske | |
| 11 | Iowa | 2018.07.08 | Dallara DW12 - Honda | Schmidt Peterson Motorsports | |
| 12 |  Toronto | 2018.07.15 | Dallara DW12 - Honda | Chip Ganassi Racing | |
| 13 | Mid-Ohio | 2018.07.29 | Dallara DW12 - Honda | Andretti Autosport | |
| 14 | Pocono | 2018.08.19 | Dallara DW12 - Honda | Andretti Autosport | |
| 15 | Gateway | 2018.08.25 | Dallara DW12 - Chevrolet | Team Penske | |
| 16 | Portland | 2018.09.02 | |||
| 17 | Sonoma | 2018.09.16 |
