Red Bull had looked mighty all weekend, securing one-twos in all three practice sessions with Ricciardo just ahead of his team mate. They should have had the front row to themselves, but instead bookend the grid, with Verstappen set to start from last after failing to set a lap time - the result of his car, which needed a new gearbox after his practice shunt, not being ready in time. But while Verstappen was MIA, Ricciardo smashed it out of the park with a lap from the very top drawer. To reiterate his speed, he pumped in another lap in the 1m10s. No one could come close. Mercedes have looked distinctly third-best in Monaco so far this weekend, but Hamilton looked to have sprung a surprise in second, only for his title rival Sebastian Vettel to snatch the position with his final run. The other Ferrari of Kimi Raikkonen was fourth, ahead of Valtteri Bottas with Esteban Ocon a brilliant sixth in the Force India and Fernando Alonso seventh in the McLaren. Renault's Carlos Sainz, the other Force India of Sergio Perez and Toro Rosso's Pierre Gasly completed the top 10.
Eliminated in Q1
| 16 | Brendon Hartley | Toro Rosso | 1:13.179 |
| 17 | Marcus Ericsson | Sauber | 1:13.265 |
| 18 | Lance Stroll | Williams | 1:13.323 |
| 19 | Kevin Magnussen | Haas | 1:13.393 |
| 20 | Max Verstappen | Red Bull | NC |
Eliminated in Q2
| 11 | Nico Hulkenberg | Renault | 1:12.411 |
| 12 | Stoffel Vandoorne | McLaren | 1:12.440 |
| 13 | Sergey Sirotkin | Williams | 1:12.521 |
| 14 | Charles Leclerc | Sauber | 1:12.714 |
| 15 | Romain Grosjean | Haas | 1:12.728 |
Top 10
| 1 | Daniel Ricciardo | Red Bull | 1:10.810 |
| 2 | Sebastian Vettel | Ferrari | 1:11.039 |
| 3 | Lewis Hamilton | Mercedes | 1:11.232 |
| 4 | Kimi Raikkonen | Ferrari | 1:11.266 |
| 5 | Valtteri Bottas | Mercedes | 1:11.441 |
| 6 | Esteban Ocon | Force India | 1:12.061 |
| 7 | Fernando Alonso | McLaren | 1:12.110 |
| 8 | Carlos Sainz | Renault | 1:12.130 |
| 9 | Sergio Pérez | Force India | 1:12.154 |
| 10 | Pierre Gasly | Toro Rosso | 1:12.221 |
