Iowa Corn 300
Iowa Speedway
.894 Mile Paved Oval
300 Laps/268.2 Miles
July 8, 2018
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status | Points |
| 1 | 11 | James Hinchcliffe | 5 | Arrow Electronics/Lucas Oil | Dallara UAK 18 | Honda | 300 | 1:47:32.4666 149.636 | 51 |
| 2 | 18 | Spencer Pigot | 21 | Fuzzy's Ultra Premium Vodka | Dallara UAK 18 | Chevy | 300 | 1:47:35.1157 149.574 | 40 |
| 3 | 10 | Takuma Sato | 30 | Panasonic/Mi-Jack | Dallara UAK 18 | Honda | 300 | 1:47:35.7172 149.560 | 36 |
| 4 | 2 | Josef Newgarden | 1 | Hitachi | Dallara UAK 18 | Chevy | 300 | 1:47:36.9962 149.531 | 35 |
| 5 | 7 | Robert Wickens | 6 | Lucas Oil | Dallara UAK 18 | Honda | 300 | 1:47:38.7880 149.489 | 30 |
| 6 | 1 | Will Power | 12 | Verizon | Dallara UAK 18 | Chevy | 299 | Flagged | 30 |
| 7 | 12 | Graham Rahal | 15 | Luther Automotive Group | Dallara UAK 18 | Honda | 299 | Flagged | 26 |
| 8 | 4 | Simon Pagenaud | 22 | Menards | Dallara UAK 18 | Chevy | 299 | Flagged | 24 |
| 9 | 5 | Alexander Rossi | 27 | NAPA Auto Parts | Dallara UAK 18 | Honda | 298 | Flagged | 22 |
| 10 | 9 | Ed Carpenter | 20 | Fuzzy's Ultra Premium Vodka | Dallara UAK 18 | Chevy | 298 | Flagged | 20 |
| 11 | 15 | Sébastien Bourdais | 18 | SealMaster | Dallara UAK 18 | Honda | 297 | Flagged | 19 |
| 12 | 6 | Scott Dixon | 9 | PNC Bank | Dallara UAK 18 | Honda | 296 | Flagged | 18 |
| 13 | 8 | Ed Jones | 10 | DC Solar | Dallara UAK 18 | Honda | 295 | Flagged | 17 |
| 14 | 7 | Charlie Kimball | 23 | Tresiba | Dallara UAK 18 | Chevy | 295 | Flagged | 16 |
| 15 | 21 | Max Chilton | 59 | Gallagher | Dallara UAK 18 | Chevy | 294 | Flagged | 15 |
| 16 | 19 | Marco Andretti | 98 | US Concrete/Curb Records | Dallara UAK 18 | Honda | 293 | Flagged | 14 |
| 17 | 13 | Tony Kanaan | 14 | ABC Supply | Dallara UAK 18 | Chevy | 292 | Flagged | 13 |
| 18 | 20 | Zachary Claman DeMelo | 19 | Paysafe | Dallara UAK 18 | Honda | 291 | Flagged | 12 |
| 19 | 3 | Ryan Hunter-Reay | 28 | DHL | Dallara UAK 18 | Honda | 283 | Suspension | 11 |
| 20 | 14 | Zach Veach | 26 | Relay/Group One Thousand One | Dallara UAK 18 | Honda | 279 | Flagged | 10 |
| 21 | 16 | Gabby Chaves | 88 | Harding Group | Dallara UAK 18 | Chevy | 99 | Handling | 8 |
| 22 | 22 | Matheus Leist | 4 | ABC Supply | Dallara UAK 18 | Chevy | 40 | Handling | 7 |
| Lap Leaders | Total | Laps |
| Josef Newgarden | 229 | 24-223, 227-255 |
| James Hinchcliffe | 45 | 256-300 |
| Will Power | 23 | 1-23 |
| Takuma Sato | 3 | 224-226 |