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 | |
| 5 | 12.05.2018 | INDYCAR Grand Prix | Indianapolis | |
| 6 | 27.05.2018 | Indianapolis 500 | Indianapolis | |
| 7 | 02.06.2018 | Chevrolet Dual in Detroit | Belle Isle | |
| 8 | 03.06.2018 | Chevrolet Dual in Detroit | Belle Isle | |
| 9 | 09.06.2018 | Texas Indy 600 | Texas Motor Speedway | |
| 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 | A. Rossi | Andretti | 126 | 1 | 3 | 3 |
| 2 | J. Newgarden | Team Penske | 104 | 1 | 1 | 3 |
| 3 | G. Rahal | Rahal Letterman Lanigan | 93 | 0 | 1 | 3 |
| 4 | S. Bourdais | Dale Coyne | 88 | 1 | 1 | 3 |
| 5 | J. Hinchcliffe | Schmidt Peterson Motorsports | 83 | 0 | 0 | 3 |
| 6 | S. Dixon | Chip Ganassi Racing | 79 | 0 | 0 | 3 |
| 7 | R. Hunter-Reay | Andretti | 73 | 0 | 0 | 3 |
| 8 | W. Power | Team Penske | 72 | 0 | 1 | 3 |
| 9 | Ed. Jones | Chip Ganassi Racing | 69 | 0 | 1 | 3 |
| 10 | M. Andretti | Andretti | 68 | 0 | 0 | 3 |
| 11 | T. Kanaan | A.J. Foyt Enterprises | 67 | 0 | 0 | 3 |
| 12 | R. Wickens | Schmidt Peterson Motorsports | 65 | 0 | 1 | 3 |
| 13 | Z. Veach | Andretti | 60 | 0 | 0 | 3 |
| 14 | T. Sato | Rahal Letterman Lanigan | 46 | 0 | 0 | 3 |
| 15 | S. Pigot | Ed Carpenter | 46 | 0 | 0 | 3 |
| 16 | S. Pagenaud | Team Penske | 44 | 0 | 0 | 3 |
| 17 | C. Kimball | Carlin | 43 | 0 | 0 | 3 |
| 18 | G. Chaves | Harding Racing | 42 | 0 | 0 | 3 |
| 19 | M. Chilton | Carlin | 36 | 0 | 0 | 3 |
| 20 | M. Leist | A.J. Foyt Enterprises | 33 | 0 | 0 | 3 |
| 21 | E. Carpenter | Ed Carpenter | 26 | 0 | 0 | 1 |
| 22 | J. Harvey | Schmidt Peterson Motorsports | 25 | 0 | 0 | 2 |
| 23 | K. Kaiser | Juncos Racing | 23 | 0 | 0 | 2 |
| 24 | J. King | Ed Carpenter | 22 | 0 | 0 | 2 |
| 25 | Z. Claman | Dale Coyne | 20 | 0 | 0 | 2 |
| 26 | R. Binder | Juncos Racing | 8 | 0 | 0 | 1 |
| 27 | P. Fittipaldi | Dale Coyne | 7 | 0 | 0 | 1 |