MADRID (Reuters) -The final opinion polls allowed under Spanish law before the July 23 general election showed the conservative People's Party (PP) well ahead of the ruling Socialists on Monday, but at the very least needing the support of far-right Vox to govern.
According to the main Spanish pollsters, which are barred from publishing surveys from Tuesday, PP would garner 131-151 seats in the 350-member lower house, falling short of an outright majority of 176.
While some polls showed that even with Vox the right could struggle to achieve a joint majority, the average of all surveys released on Monday by pollsters GAD3, 40db, IMOP, Sigma 2 and Simple Logica shows PP and Vox getting 140 and 36 seats, respectively - just on the line.
Prime Minister Pedro Sanchez's Spanish Socialist Workers' Party (PSOE) would get 98-115 seats, according to the surveys whose projections work out at an average of 108 seats.
A hypothetical alliance between PP and the anti-immigration, anti-feminist Vox could lead to PP leader Alberto Nunez Feijoo becoming premier, but much will depend on who comes third in a number of provinces, and how many lawmakers a few regional parties, who have supported Sanchez's minority coalition over the last four years, elect.
A national PP-Vox alliance would give the far-right a role in government for the first time since the current constitution was approved in 1978 after the four decades of Francisco Franco's dictatorship.
Vox is almost neck and neck with Sumar, a new alliance of far-left groups that includes Podemos, the junior ruling coalition partner. Sumar would fetch 25-39 seats, polls show.
In many electoral districts, the third spot is crucial as the fourth placed party generally fails to elect legislators.
Sanchez, who still hopes to have enough support in parliament to form a government, cancelled part of his agenda in Brussels on Monday to join a campaign rally in the northeastern town of Huesca, where the PSOE is fighting to get an extra seat.
Sumar and PSOE have said they intend to recreate the ruling coalition.
Feijoo has been coy about whether he would seal a post-election alliance with Vox even though the two have teamed up in several regions and many municipalities after local elections on May 28, in which the ruling coalition was routed.
Sanchez called the snap election on May 29, apparently hoping to out-manoeuvre the PP and force it to campaign while also negotiating uncomfortable coalition deals with Vox in the regions.
(Reporting by Inti Landauro; Editing by Andrei Khalip, Mike Harrison and Barbara Lewis)