MUSCAT (Reuters) - Oman plans to spend 119 million rials ($310 million) on expansions of an airport and sea port in the south of the Gulf state, its economy minister said on Wednesday.

The extension of the Salalah airport will cost 91 million rials while the Salalah port, including the constructions of four berths and a goods terminal, are valued at 28 million rials, the minister, Ahmad Mekki, said in a statement.

Firms including Bechtel, India's Nagarjuna, and a Turkey's joint venture of CCC and TAV Construction made bids for the tender for the expansion of Salalah airport last month.

Salalah airport currently handles only domestic and regional flights. Oman wants to expand it and turn it into an international terminal.

The expansion of the Salalah port would raise its capacity by 20 percent, a Salalah port official said, adding that the tenders for the port projects are under evaluation.

(Reporting by Saleh al-Shaibany)