Bahrain said on Wednesday it had reopened its airspace, which had been closed since the start of the Middle East war, after Iran and the US agreed a two-week ceasefire.
Iraq had earlier announced it was reopening its airspace.
Civil aviation authorities have "announced the reopening of airspace over the Kingdom of Bahrain", the Bahrain News Agency reported.
It added that the operator of Bahrain International Airport, near the capital Manama, "confirms the gradual resumption of flights" and is working "to ensure the efficient and smooth return of operational activities, while safeguarding the safety and security of travellers".
Gulf nations have borne the brunt of Iran's retaliatory attacks since the United States and Israel launched strikes in late February that ignited a regional war.
The United States and Iran agreed to a two-week ceasefire on Tuesday in an 11th-hour bid to avert all-out destruction threatened by US President Donald Trump.