MADRID, June 19 (Reuters) - Spain's conservative People's Party is set to win the most seats in the lower house of parliament in next month's national election, far ahead of the ruling Socialist Workers' Party (PSOE), a poll released by El Pais newspaper showed on Monday. The survey, carried out between June 12 and 14, showed the PP widening its lead over Prime Minister Pedro Sanchez' PSOE, pollster 40DB said. The poll, commissioned by El Pais newspaper, estimated that the PP would get between 128 and 142 seats in the 350-member lower house, up from 131 in the previous poll held between May 31 and June 1. The PSOE would get between 99 and 109 seats, it showed, compared with 107 in the previous such survey. The previous poll carried out between May 31 and June 1 had attributed 41 seats to Sumar.

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Persons: Pedro Sanchez, pollster 40DB, Sanchez, Podemos, 40DB, Gareth Jones Organizations: People's Party, Socialist Workers ' Party, PSOE, El, El Pais, Vox, Inti, Thomson Locations: MADRID, El Pais