It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) used to give only one salam in prayer, turning his face slightly to the right side.
Zuhayr bin Muhammad is alone in narrating it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2985
(a) Al-Qasim reports from Sayyidah Aishah (may Allah be pleased with her) that she used to give only one salam, and that too facing forward, and she would say: 'As-salamu alaykum' (Peace be upon you).
(b) It is also reported from Anas bin Malik, Samurah bin Jundub and Salamah bin al-Akwa' (may Allah be pleased with them), and all of them narrate it from the Prophet (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2986
It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to give one salam in prayer, facing forward, and when he gave the salam to his right, he would then give it to his left as well.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2988
(a) It is narrated from Sayyiduna Salamah bin al-Akwa' (may Allah be pleased with him) that he said: I saw the Messenger of Allah (peace and blessings be upon him); he performed ablution and wiped his head once, and he prayed and gave only one salam.
(b) And it is reported from a large group of the Companions that they used to give only one salam.
(c) This is permissible, that is, confining oneself to one is also allowed. And success is from Allah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2989