| «1991-13» | Portugal Grand Prix - XX Grande Premio de Portugal |
| 1991-09-22 | Estoril - Autódromo Fernanda Pires da Silva - 71 laps × 4.35 km : 308.85 km |
| Pos | Car | Driver | Constructor | Time | Speed | Lap | Gap |
|---|---|---|---|---|---|---|---|
| 1 | 5 | Nigel Mansell | Williams • Renault | 01:18.179 | 200.310 km/h | 36 | |
| 2 | 6 | Riccardo Patrese | Williams • Renault | 01:18.350 | 199.872 km/h | 38 | +00.171 |
| 3 | 2 | Gerhard Berger | McLaren • Honda | 01:18.856 | 198.590 km/h | 36 | +00.677 |
| 4 | 1 | Ayrton Senna | McLaren • Honda | 01:18.929 | 198.406 km/h | 50 | +00.750 |
| 5 | 20 | Nelson Piquet | Benetton • Ford Cosworth | 01:19.073 | 198.045 km/h | 45 | +00.894 |
| 6 | 19 | Michael Schumacher | Benetton • Ford Cosworth | 01:19.206 | 197.712 km/h | 68 | +01.027 |
| 7 | 33 | Andrea de Cesaris | Jordan • Ford Cosworth | 01:19.210 | 197.702 km/h | 48 | +01.031 |
| 8 | 28 | Jean Alesi | Ferrari | 01:19.418 | 197.185 km/h | 55 | +01.239 |
| 9 | 16 | Ivan Capelli | Leyton House • Ilmor | 01:19.519 | 196.934 km/h | 45 | +01.340 |
| 10 | 27 | Alain Prost | Ferrari | 01:19.531 | 196.904 km/h | 33 | +01.352 |
| 11 | 23 | Pierluigi Martini | Minardi • Ferrari | 01:19.581 | 196.781 km/h | 57 | +01.402 |
| 12 | 15 | Mauricio Gugelmin | Leyton House • Ilmor | 01:19.757 | 196.346 km/h | 65 | +01.578 |
| 13 | 9 | Michele Alboreto | Footwork • Ford Cosworth | 01:20.082 | 195.550 km/h | 60 | +01.903 |
| 14 | 32 | Roberto Moreno | Jordan • Ford Cosworth | 01:20.096 | 195.515 km/h | 57 | +01.917 |
| 15 | 4 | Stefano Modena | Tyrrell • Honda | 01:20.342 | 194.917 km/h | 30 | +02.163 |
| 16 | 24 | Gianni Morbidelli | Minardi • Ferrari | 01:20.357 | 194.880 km/h | 56 | +02.178 |
| 17 | 11 | Mika Hakkinen | Lotus • Judd | 01:20.445 | 194.667 km/h | 35 | +02.266 |
| 18 | 7 | Martin Brundle | Brabham • Yamaha | 01:20.480 | 194.583 km/h | 27 | +02.301 |
| 19 | 25 | Thierry Boutsen | Ligier • Lamborghini | 01:20.700 | 194.052 km/h | 38 | +02.521 |
| 20 | 26 | Erik Comas | Ligier • Lamborghini | 01:20.781 | 193.857 km/h | 43 | +02.602 |
| 21 | 30 | Aguri Suzuki | Lola • Ford Cosworth | 01:21.586 | 191.945 km/h | 33 | +03.407 |
| 22 | 3 | Satoru Nakajima | Tyrrell • Honda | 01:21.966 | 191.055 km/h | 41 | +03.787 |
| 23 | 22 | JJ Lehto | Dallara • Judd | 01:22.165 | 190.592 km/h | 13 | +03.986 |
| 24 | 21 | Emanuele Pirro | Dallara • Judd | 01:22.592 | 189.607 km/h | 11 | +04.413 |
| 25 | 8 | Mark Blundell | Brabham • Yamaha | 01:22.801 | 189.128 km/h | 12 | +04.622 |
| 26 | 12 | Johnny Herbert | Lotus • Judd | 01:39.804 | 156.908 km/h | 1 | +21.625 |