Lewis Hamilton a été le plus rapide de la première séance d’essais libres du jeudi à Monaco. Max Verstappen a fait le 2e temps. Valtteri Bottas est 3e et on retrouve ensuite les Ferrari. Pierre Gasly pointe au 6e rang.
| Pos | No | Pilote | Équipe | Temps | Écart | Tours |
|---|---|---|---|---|---|---|
| 1 | 44 | Lewis Hamilton | Mercedes | 1:12.106 | 47 | |
| 2 | 33 | Max Verstappen | Red Bull Racing Honda | 1:12.165 | +0.059s | 35 |
| 3 | 77 | Valtteri Bottas | Mercedes | 1:12.178 | +0.072s | 43 |
| 4 | 16 | Charles Leclerc | Ferrari | 1:12.467 | +0.361s | 25 |
| 5 | 5 | Sebastian Vettel | Ferrari | 1:12.823 | +0.717s | 36 |
| 6 | 10 | Pierre Gasly | Red Bull Racing Honda | 1:13.170 | +1.064s | 41 |
| 7 | 27 | Nico Hulkenberg | Renault | 1:13.227 | +1.121s | 45 |
| 8 | 20 | Kevin Magnussen | Haas Ferrari | 1:13.232 | +1.126s | 24 |
| 9 | 7 | Kimi Räikkönen | Alfa Romeo Racing Ferrari | 1:13.363 | +1.257s | 39 |
| 10 | 8 | Romain Grosjean | Haas Ferrari | 1:13.379 | +1.273s | 23 |
| 11 | 3 | Daniel Ricciardo | Renault | 1:13.413 | +1.307s | 41 |
| 12 | 99 | Antonio Giovinazzi | Alfa Romeo Racing Ferrari | 1:13.437 | +1.331s | 39 |
| 13 | 26 | Daniil Kvyat | Scuderia Toro Rosso Honda | 1:13.731 | +1.625s | 40 |
| 14 | 23 | Alexander Albon | Scuderia Toro Rosso Honda | 1:13.827 | +1.721s | 45 |
| 15 | 4 | Lando Norris | McLaren Renault | 1:14.278 | +2.172s | 39 |
| 16 | 11 | Sergio Perez | Racing Point BWT Mercedes | 1:14.566 | +2.460s | 40 |
| 17 | 63 | George Russell | Williams Mercedes | 1:15.115 | +3.009s | 40 |
| 18 | 88 | Robert Kubica | Williams Mercedes | 1:15.514 | +3.408s | 24 |
| 19 | 18 | Lance Stroll | Racing Point BWT Mercedes | 1:16.135 | +4.029s | 37 |
| 20 | 55 | Carlos Sainz | McLaren Renault | 2:00.670 | +48.564s | 4 |