Ford's Estonian Markko Martin was nearly three minutes adrift of Solberg in third place.
BBC: SPORT | Motorsport | World Rally | Solberg wins in Wales
The chase for the drivers' title had been reduced to a two-way scrap between Solberg and Loeb.
Solberg won his first-ever world rally in Wales last year and was in control from the first morning.
However, Loeb still leads nearest rival Solberg by 28 points in the championship with four rounds remaining after Britain.
BBC: SPORT | Motorsport | World Rally | Solberg wins in Wales
He finished with a handy lead over Norwegian Solberg in a Subaru, with Spain's Xavier Pons almost another minute behind in his Citroen.
Citroen's world champion won 10 of the rally's 17 stages, finishing the final day 59.6 seconds ahead of Subaru's Petter Solberg.
BBC: SPORT | Motorsport | Rallying | Dominant Loeb extends winning run
Fellow Finn Mikko Hirvonen leads by 25.8 seconds from Petter Solberg.
After seven rallies, Loeb leads the championship with 55 points, ahead of Solberg on 42 points and Estonian Markko Martin on 38 points.
BBC: SPORT | Motorsport | Rallying | Dominant Loeb extends winning run
But that was not enough to put the outcome in doubt going into the final stage at Margam Park, which was won by Solberg.
If Mr Solberg is appointed to the Supreme Court, he will be the first judge at that level to be a West Bank settler.
Peugeot's Marcus Gronholm finished 15.7 seconds behind Solberg in third place.
BBC: SPORT | Motorsport | Rallying | Dominant Loeb extends winning run
Henning Solberg, elder brother of Petter, saw his hopes of a top-three finish dashed when he was forced to stop on stage nine with mechanical problems.
BBC: Marcus Gronholm had won four of the six stages on day one
Spain's Dani Sordo took another solid third for Citroen with Norwegian Petter Solberg once again impressing by taking fourth place in his dated 2006 model Citroen Xsara.
Celtic made it 3-0 before half-time when Moravcik teased his way past Thomas Solberg before crashing the ball into the roof of the net with Leighton powerless.
Evgeny Novikov (Citroen Junior) finished the day in fifth place after rivals Henning Solberg (Stobart Ford), Dani Sordo (Citroen) and Mads Ostberg (Adapta Subaru) all hit problems.
Loeb had no need to push himself on the final day and started with a pair of second-place finishes behind the Subaru of 2003 world champion Petter Solberg.
BBC: SPORT | Motorsport | Rallying | Loeb makes it five wins in a row
Loeb took over at the front when he and Solberg dead-heated on the eighth stage and then stretched his lead by winning the penultimate stage of the day.
Norway's Petter Solberg is in second, 26.3 seconds behind Gronholm.
BBC: SPORT | Motorsport | Rallying | Loeb frustrated as Gronholm stars
Solberg also crashed his Peugeot at high speed on the same stage while Britain's Matthew Wilson was forced to retire after hitting a rock and losing a wheel on stage one.
Norwegian Solberg, who started the day in eighth overall, won two stages on the third leg to go into the final stage just 10.7 seconds behind sixth-placed Jussi Valimaki.
BBC: SPORT | Motorsport | Rallying | Loeb makes it five wins in a row
Petter Solberg, chasing his fourth consecutive win in Wales, did not win a single stage on Friday but finds himself in second after staying with the pace of Loeb.
BBC: SPORT | Motorsport | Rallying | Penalised Loeb remains on course
For the second year running the rally had turned into a two-man duel between Solberg and his French rival, who were both far faster than the rest through the Welsh forests.
BBC: SPORT | Motorsport | World Rally | Solberg wins in Wales
They particularly worry about the rise of judges such as Noam Solberg, a religious-nationalist from Alon Shvut, a Jewish settlement in the West Bank, whom right-wingers want appointed to the Supreme Court.
The Citroen driver, bidding for his sixth win in a row, will begin the leg in fourth, 74 seconds behind the leader but just two seconds behind the Citroen of third-placed Petter Solberg.
Latvala was on course for third but an electrical problem pegged him back eight minutes this morning and he ended up sixth, behind Henning Solberg in third, fourth-placed Federico Villagra and Matthew Wilson in fifth position.
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