Calendar
| # | Start Date | Race title | Circuit | Winner |
|---|---|---|---|---|
| 1 | 11.03.2018 | Firestone Grand Prix Of St. Petersburg | St. Petersburg | S. Bourdais |
| 2 | 07.04.2018 | Phoenix Grand Prix | Avondale | J. Newgarden |
| 3 | 15.04.2018 | Toyota Grand Prix of Long Beach | Long Beach | A. Rossi |
| 4 | 22.04.2018 | Honda Indy Grand Prix of Alabama | Barber | J. Newgarden |
| 5 | 12.05.2018 | INDYCAR Grand Prix | Indianapolis | W. Power |
| 6 | 27.05.2018 | Indianapolis 500 | Indianapolis | W. Power |
| 7 | 02.06.2018 | Chevrolet Dual in Detroit | Belle Isle | S. Dixon |
| 8 | 03.06.2018 | Chevrolet Dual in Detroit | Belle Isle | R. Hunter-Reay |
| 9 | 09.06.2018 | Texas Indy 600 | Texas Motor Speedway | S. Dixon |
| 10 | 24.06.2018 | KOHLER Grand Prix | Elkhart Lake | |
| 11 | 08.07.2018 | Iowa Corn 300 | Iowa Speedway | |
| 12 | 15.07.2018 | Honda Indy Toronto | Streets of Toronto | |
| 13 | 29.07.2018 | Honda Indy 200 | Mid-Ohio SCC | |
| 14 | 19.08.2018 | ABC Supply 500 | Pocono Raceway | |
| 15 | 25.08.2018 | Bommarito Automotive Group 500 | Gateway Motorsports Park | |
| 16 | 02.09.2018 | Portland International Raceway | Portland | |
| 17 | 16.09.2018 | GoPro Grand Prix of Sonoma | Sonoma Raceway |
Standings
| # | Driver | Team | P | Wins | Podiums | RWP |
|---|---|---|---|---|---|---|
| 1 | S. Dixon | Chip Ganassi Racing | 357 | 2 | 4 | 9 |
| 2 | A. Rossi | Andretti | 334 | 1 | 5 | 9 |
| 3 | W. Power | Team Penske | 321 | 2 | 4 | 9 |
| 4 | R. Hunter-Reay | Andretti | 308 | 1 | 3 | 9 |
| 5 | J. Newgarden | Team Penske | 289 | 2 | 2 | 9 |
| 6 | G. Rahal | Rahal Letterman Lanigan | 250 | 0 | 1 | 9 |
| 7 | R. Wickens | Schmidt Peterson Motorsports | 244 | 0 | 2 | 9 |
| 8 | S. Pagenaud | Team Penske | 229 | 0 | 1 | 9 |
| 9 | S. Bourdais | Dale Coyne | 218 | 1 | 1 | 9 |
| 10 | M. Andretti | Andretti | 213 | 0 | 0 | 9 |
| 11 | J. Hinchcliffe | Schmidt Peterson Motorsports | 209 | 0 | 1 | 8 |
| 12 | Ed. Jones | Chip Ganassi Racing | 183 | 0 | 2 | 9 |
| 13 | T. Sato | Rahal Letterman Lanigan | 169 | 0 | 0 | 9 |
| 14 | T. Kanaan | A.J. Foyt Enterprises | 157 | 0 | 0 | 9 |
| 15 | Z. Veach | Andretti | 147 | 0 | 0 | 9 |
| 16 | S. Pigot | Ed Carpenter | 147 | 0 | 0 | 9 |
| 17 | C. Kimball | Carlin | 139 | 0 | 0 | 9 |
| 18 | G. Chaves | Harding Racing | 138 | 0 | 0 | 9 |
| 19 | M. Leist | A.J. Foyt Enterprises | 133 | 0 | 0 | 9 |
| 20 | E. Carpenter | Ed Carpenter | 128 | 0 | 1 | 3 |
| 21 | M. Chilton | Carlin | 121 | 0 | 0 | 9 |
| 22 | Z. Claman | Dale Coyne | 85 | 0 | 0 | 6 |
| 23 | J. King | Ed Carpenter | 70 | 0 | 0 | 6 |
| 24 | C. Muñoz | Andretti | 53 | 0 | 0 | 1 |
| 25 | J. Harvey | Schmidt Peterson Motorsports | 53 | 0 | 0 | 3 |
| 26 | K. Kaiser | Juncos Racing | 45 | 0 | 0 | 4 |
| 27 | H. Castroneves | Team Penske | 40 | 0 | 0 | 2 |
| 28 | R. Binder | Juncos Racing | 39 | 0 | 0 | 4 |
| 29 | J.R. Hildebrand | Panther Dreyer & Reinbold | 38 | 0 | 0 | 1 |
| 30 | S. Wilson | Andretti | 31 | 0 | 0 | 1 |
| 31 | O. Servià | Scuderia Corsa with RLL | 27 | 0 | 0 | 1 |
| 32 | S. Ferrucci | Dale Coyne | 18 | 0 | 0 | 2 |
| 33 | C. Daly | Dale Coyne | 18 | 0 | 0 | 1 |
| 34 | D. Patrick | Ed Carpenter | 13 | 0 | 0 | 1 |
| 35 | J. Howard | SPM / AFS Racing | 12 | 0 | 0 | 1 |
| 36 | S. Karam | Panther Dreyer & Reinbold | 10 | 0 | 0 | 1 |
| 37 | J. Davison | A.J. Foyt Enterprises | 10 | 0 | 0 | 1 |
| 38 | P. Fittipaldi | Dale Coyne | 7 | 0 | 0 | 1 |