Saudi state airline Saudia also announced Monday that it would suspend flights to and from Toronto starting August 13. The state airline operates at least two routes flying from Toronto.
Officials said they would cover cancellation fees, issue refunds and find alternative flights for stranded travellers, according to a story on the CBC National website.
Saudi Arabia's main state wheat-buying agency has told grains exporters it will no longer buy Canadian wheat and barley in its worldwide tenders, European traders said on Tuesday.
A spokesman said: "The Kingdom of Saudi Arabia...will not accept interference in its internal affairs or imposed diktats from any country".
Canada plans to seek help from United Arab Emirates and Britain to defuse an escalating diplomatic dispute with Saudi Arabia, sources said on Tuesday, as traders revealed the Arab state would no longer buy Canadian wheat and barley.
Canada has said it's alarmed by the move out of Saudi Arabia, but has not walked back the comments that apparently prompted the row in the first place.
Last Tuesday, the Office of the UN High Commissioner for Human Rights said at least 15 human rights defenders and women's rights activists critical of the Saudi government had been arrested or detained arbitrarily since 15 May.
A Reuters report, quoting a State Department official, said the USA has urged the Saudis to respect due process, in the first comments by Washington since the dispute erupted between Riyadh and Ottawa over the arrest of rights campaigners.
Star witness ends testimony in fraud trial of ex-Trump campaign chief
Gates testified that Manafort asked him to float Calk, who was on Trump's economic advisory council, for Secretary of the Army. Gates pleaded guilty in February and agreed to cooperate with prosecutors under a deal that could lead to a reduced sentence.
The European Commission also struck a neutral tone in its response, saying it is seeking clarification about the arrest of activists, but avoided being drawn into the dispute between Riyadh and Canada. She was given the US International Women of Courage Award in 2012.
A number of countries in the region have defended Saudi Arabia. "Crown Prince Mohammad bin Salman is trying to pull off a very delicate process in which he liberalizes some aspects of Saudi society, which is extremely conservative, but also retains virtually absolute power over that society", Kliment said.
Infographic KSA, a pro-government Saudi Twitter account, shared the image on Monday, hours after Riyadh announced it had expelled the Canadian ambassador and suspended new trade and investment with Ottawa.
In recent months, Saudi Arabia has reacted more aggressively against countries that it perceives as intervening in its internal affairs. "We urge the Saudi authorities to immediately release them and all other peaceful #humanrights activists".
"This particular case regarding Canada - we have raised that with the government of Saudi Arabia". Some 327 students from Saudi Arabia were enrolled at the university during the previous academic year.
Along with throwing out the Canadian ambassador and suspending air service between the two countries, Saudi Arabia is demanding thousands of its students leave Canada for new locations.
"We will always speak up for human rights, we will always speak up for women's rights around the world", she told reporters in Vancouver.