After spending much of Saturday meeting with King Salman and other members of the royal family, Trump was to end the day at a banquet dinner at the Murabba Palace.
The host of the event declared that Trump was being honored for "his quest to enhance security and stability in the region and around the world".
The honour has also been bestowed to Russian President Vladimir Putin, Prime Minister Theresa May and Mr Trump's predecessor, Barack Obama.
Trump can expect a warm reception when he arrives in the oil-rich kingdom for talks with King Salman, but the domestic mood was grim following news that the FBI's investigation into his campaign's ties with Russian Federation extends to a current senior White House official.
Some have already commentated that Donald Trump is an unusual choice to deliver such a message but for now, Saudi officials are giving him the benefit of the doubt.
Trump and his wife Melania, who did not cover her hair, walked to the tarmac where they were received by King Salman bin Abdulaziz Al Saud.
Foreign Office officials earlier had confirmed to a leading daily that efforts were underway to arrange a maiden bilateral meeting between Trump and Nawaz at the sidelines of the summit. The trip is a key test of the president's diplomatic skills and a chance to add substance to a foreign policy he has described broadly as "America First".
Melania Trump's decision not to wear a headscarf in the Middle East is drawing attention and a mixed reaction on social media.
First lady Melania Trump emerged from the front of the plane with the president, for their first public appearance overseas, dressed in a black long-sleeved pantsuit and an oversized gold belt, her brown hair hanging down over her shoulders.
In January 2015, Mr Trump criticised then-First Lady Michelle Obama for doing the same.
The eight-day tour, including four countries in the Middle East and Europe, comes hours after Donald said he was the victim of the "greatest political witch-hunt in USA history".
Pakistan Prime Minister Nawaz Sharif will leave for Saudi Arabia tomorrow to attend an global Islamic conference where he is likely to meet US President Donald Trump.
Shortly after taking office, Trump sought to block people from several Muslim-majority nations from entering the United States, but the travel ban has been blocked by federal courts.
President Donald Trump arrived in the Saudi Arabian capital of Riyadh Saturday morning, marking the kick-off of his first foreign trip as president.
Trump waved as he stood atop stairs that had been rolled to the side of the official presidential aircraft as it landed at Riyadh's airport.
Melania is not the first one among Western female dignitaries to forgo the traditional head scarf or a hijab.
Anthony said that there has been a shift from Trump's presidential campaign, when he was seen as being openly hostile toward the Muslim world and Kingdom.
"I'll speak with Muslim leaders and challenge them to fight hatred and extremism, and embrace a peaceful future for their faith", Trump said ahead of his visit. A military brass band played, cannons boomed and seven Saudi jets flew over in V-formation, trailing red, white and blue smoke. White House aides view the address as a counter to Obama's 2009 speech to the Muslim world, which Trump criticized as too apologetic for US actions in the region.
For a president who campaigned on an "America First" platform, the trip is a crucial moment for US allies to size up Trump's commitment to decades-long partnerships while trying to move behind his previous controversial statements.
Trump's visit is aimed at building stronger partnerships to combat terrorism in the region.
Trump remains popular in the Gulf, where leaders hope he'll take a harder line on Iran than Obama did.