With Mark Webber and Antonio Pizzonia seventh and tenth in the third practice session at Spa the final practice would get under way. With the conditions improving the session had not been declared wet. After failing to set a time in the earlier session it would be Ferrari's Rubens Barrichello who would set a very early time, 1m:52.007. Rubens would be joined by a flood of drivers, including team-mate Michael Schumacher, both Renault drivers, both BAR drivers, both Jordan drivers, and Coulthard.

Sato was the next driver to set a time going fastest with a 1m:50.856. But Takuma's time was quick passed by both Michael and Villeneuve. Michael was now fastest with a 1m:49.449. Jacques had set a time of 1m:50.253. Button was in sixth with a 1m:52.354. Massa was in fifth behind fourth placed Sato. Fisichella and Trulli were now in eighth and ninth. Alonso would move into second with a 1m:49.812. Both Mark and Antonio had completed their installation lap. Trulli was now in fifth, 1m:50.031. At the front it would be Fisichella who was now fastest, 1m:48.909. Mark was in  eleventh with a 1m:52.934. Coulthard was in twelfth. Toyota's Ralf Schumacher had moved into fourth with a 1m:49.586. Giancarlo was able to improve his time with a 1m:48.658.

But Kimi would return to his place at the top with a 1m:48.090, 0.568 seconds ahead of Fisichella. Mark was now in sixth with a 1m:49.765. Antonio was in twelfth with a 1m:51.459. Ralf was now third with a time of 1m:49.305. Kimi would move into the 1m:47 second bracket with a time of 1m:47.511. Alonso was in fifth ahead of Ruben's in sixth. Montoya was yet to set a time with thirty minutes remaining.

But on his first lap Juan Pablo would moved ahead of team-mate Raikkonen with a time of 1m:47.463. With twenty five minutes remaining there was only a handful of drivers out on the circuit, the others having returned to their pits to make further adjustments to their cars. Slowest in the session at this time were the two Minardi's of Doornbos and Albers. Massa would move into fourth with a time of 1m:48.723. Alonso would come back out to join team-mate Fisichella.

Giancarlo was able to move ahead of Kimi with a time of 1m:47.420. Fernando was on a quick lap been fastest in the first two sectors. Both Mark and Antonio had also return ed to the track. Fernando would move into the top spot with a time of 1m:46.920 to be 0.5 seconds ahead of Giancarlo. Rubens was in fifth and Button sixth. Mark's next lap would see him move into seventh with a time of 1m:48.213. Antonio was down in fourteenth, 1m:49.438. Michael and Ralf were in tenth and eleventh.

The start of the final fifteen minutes would see Kimi back out looking to move ahead of Alonso. Despite setting fastest times in the first two sectors he could not move ahead of the Renault after hitting traffic in the final sector. He was in fourth behind Montoya. Montoya was back out while Michael had moved into fifth, 1m:47.773. On his first lap Juan Pablo was able to go fastest with a time of 1m:46.858 to be 0.062 ahead of Alonso.
As the final five minutes of the session commenced Sato would move into fifth and Button third. Alonso was also on a very quick lap setting fastest times in the first and third sectors to finish with a time of 1m:46.307. Fisichella had moved ahead of Button to now be in third, 1m:47.049. But in somewhat of a surprise Jarno Trulli would go second falsest with a time of 1m:46.681.

There was the usual flood of drivers out setting times in the final moments of the session. Ralf was now in fifth with a 1m:47.054. Albers had moved into fifteenth with a 1m:49.166. Kimi would move up the order to now be second with a 1m:46.641. Antonio was now eleventh with a 1m:48.092. Mark was down in thirteenth after having failed to improve his time. The session would end with Alonso fastest from Raikkonen, Trulli, Montoya, Fisichella, Ralf Schumacher, Button, Sato, Michael Schumacher, and Barrichello.