| «1988-13» | Portugal Grand Prix - XVII Grande Premio de Portugal |
| 1988-09-25 | Estoril - Autódromo Fernanda Pires da Silva - 70 laps × 4.35 km : 304.5 km |
| Pos | Grid | Car | Driver | Constructor | Q1 | Q2 | Best | Gap | Interval |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 11 | Alain Prost | McLaren • Honda | 01:18.378 | 01:17.411 | 01:17.411 | 202.297 km/h | |
| 2 | 2 | 12 | Ayrton Senna | McLaren • Honda | 01:18.032 | 01:17.869 | 01:17.869 | +00.458 (+0.592%) | +00.458 |
| 3 | 3 | 16 | Ivan Capelli | March • Judd | 01:20.390 | 01:18.812 | 01:18.812 | +01.401 (+1.810%) | +00.943 |
| 4 | 4 | 28 | Gerhard Berger | Ferrari | 01:20.065 | 01:18.903 | 01:18.903 | +01.492 (+1.927%) | +00.091 |
| 5 | 5 | 15 | Mauricio Gugelmin | March • Judd | 01:20.791 | 01:19.045 | 01:19.045 | +01.634 (+2.111%) | +00.142 |
| 6 | 6 | 5 | Nigel Mansell | Williams • Judd | 01:20.908 | 01:19.131 | 01:19.131 | +01.720 (+2.222%) | +00.086 |
| 7 | 7 | 27 | Michele Alboreto | Ferrari | 01:21.647 | 01:19.372 | 01:19.372 | +01.961 (+2.533%) | +00.241 |
| 8 | 8 | 1 | Nelson Piquet | Lotus • Honda | 01:19.551 | 01:19.872 | 01:19.551 | +02.140 (+2.764%) | +00.179 |
| 9 | 9 | 19 | Alessandro Nannini | Benetton • Ford Cosworth | 01:21.008 | 01:19.572 | 01:19.572 | +02.161 (+2.792%) | +00.021 |
| 10 | 10 | 17 | Derek Warwick | Arrows • Megatron | 01:21.240 | 01:19.603 | 01:19.603 | +02.192 (+2.832%) | +00.031 |
| 11 | 11 | 6 | Riccardo Patrese | Williams • Judd | 01:19.878 | 01:19.797 | 01:19.797 | +02.386 (+3.082%) | +00.194 |
| 12 | 12 | 22 | Andrea de Cesaris | Rial • Ford Cosworth | 01:21.386 | 01:19.940 | 01:19.940 | +02.529 (+3.267%) | +00.143 |
| 13 | 13 | 20 | Thierry Boutsen | Benetton • Ford Cosworth | 01:20.700 | 01:20.314 | 01:20.314 | +02.903 (+3.750%) | +00.374 |
| 14 | 14 | 23 | Pierluigi Martini | Minardi • Ford Cosworth | 01:21.292 | 01:20.741 | 01:20.741 | +03.330 (+4.302%) | +00.427 |
| 15 | 15 | 29 | Yannick Dalmas | Lola • Ford Cosworth | 01:21.655 | 01:20.748 | 01:20.748 | +03.337 (+4.311%) | +00.007 |
| 16 | 16 | 2 | Satoru Nakajima | Lotus • Honda | 01:22.496 | 01:20.783 | 01:20.783 | +03.372 (+4.356%) | +00.035 |
| 17 | 17 | 36 | Alex Caffi | Dallara • Ford Cosworth | 01:22.349 | 01:20.922 | 01:20.922 | +03.511 (+4.536%) | +00.139 |
| 18 | 18 | 18 | Eddie Cheever | Arrows • Megatron | 01:21.519 | 01:20.965 | 01:20.965 | +03.554 (+4.591%) | +00.043 |
| 19 | 19 | 24 | Luis Perez-Sala | Minardi • Ford Cosworth | 01:21.909 | 01:21.094 | 01:21.094 | +03.683 (+4.758%) | +00.129 |
| 20 | 20 | 30 | Philippe Alliot | Lola • Ford Cosworth | 01:21.809 | 01:21.096 | 01:21.096 | +03.685 (+4.760%) | +00.002 |
| 21 | 21 | 14 | Philippe Streiff | AGS • Ford Cosworth | 01:21.644 | 01:21.418 | 01:21.418 | +04.007 (+5.176%) | +00.322 |
| 22 | 22 | 3 | Jonathan Palmer | Tyrrell • Ford Cosworth | 01:22.797 | 01:21.788 | 01:21.788 | +04.377 (+5.654%) | +00.370 |
| 23 | 23 | 25 | René Arnoux | Ligier • Judd | 01:22.786 | 01:21.790 | 01:21.790 | +04.379 (+5.657%) | +00.002 |
| 24 | 24 | 26 | Stefan Johansson | Ligier • Judd | 01:22.778 | 01:22.035 | 01:22.035 | +04.624 (+5.973%) | +00.245 |
| 25 | 25 | 21 | Nicola Larini | Osella | 01:22.883 | 01:22.119 | 01:22.119 | +04.708 (+6.082%) | +00.084 |
| 26 | 26 | 31 | Gabriele Tarquini | Coloni • Ford Cosworth | 01:23.057 | 01:22.170 | 01:22.170 | +04.759 (+6.148%) | +00.051 |
| 27 | 4 | Julian Bailey | Tyrrell • Ford Cosworth | 01:22.946 | 01:22.296 | 01:22.296 | +04.885 (+6.310%) | +00.126 | |
| 28 | 9 | Piercarlo Ghinzani | Zakspeed | 01:24.127 | 01:22.549 | 01:22.549 | +05.138 (+6.637%) | +00.253 | |
| 29 | 33 | Stefano Modena | Eurobrun • Ford Cosworth | 01:23.075 | 01:23.232 | 01:23.075 | +05.664 (+7.317%) | +00.526 | |
| 30 | 10 | Bernd Schneider | Zakspeed | 01:23.393 | 01:23.300 | 01:23.300 | +05.889 (+7.607%) | +00.225 | |
| 31 | 32 | Oscar Larrauri | Eurobrun • Ford Cosworth | 01:23.075 |