BY JAMES ANGELOS

BERLIN—Greek Prime Minister Antonis Samaras plans to undertake a delicate diplomatic mission on Sunday—to Bavaria.

The southern German province has been a hotbed of opposition to extending Greece more time and money to overcome its debt troubles. Hoping to convince Bavaria’s powerful conservative political establishment that saving Greece is worth the money, Mr. Samaras and Greece’s finance minister are scheduled to have dinner with Bavarian Premier Horst Seehofer.

Mr. Samaras and Mr. Seehofer, who also heads the Christian Social Union, the Bavarian sister-party to German Chancellor Angela Merkel’s Christian Democrats, will “exchange political views,” according to the Bavarian state government.