The Ryanair flight, which was travelling from Rome to Lisbon, landed at around 8 am this morning, prompting the authorities to take action.
A string of bomb threats targeting flights across Europe continued on Friday, with two more aircraft affected. A Ryanair flight arriving in Lisbon from Rome became the latest to face a security alert.
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According to reports, a warning about a possible explosive device on board was made through an anonymous telephone call to the control tower at Rome's Fiumicino Airport.
Separately, CNN Portugal reported that Portugal's Public Security Police (PSP) received a telephone call from a person described as a "law enforcement officer", warning of a possible explosive device on board. The caller's identity was reportedly verified by the Judicial Police (PJ).
The Ryanair aircraft landed at Lisbon's Humberto Delgado Airport shortly before 8 am. Authorities are investigating the threat, but there has been no confirmation of explosives on board.
When contacted by Euronews, Lisbon Airport referred enquiries to the PSP, which has not yet confirmed the reported incident. Euronews also attempted to contact the PJ but has not received a response.
Another bomb alert was reported on a Wizz Air flight travelling from Prague to Rome. The aircraft was diverted to Venice, where it landed.
The latest incidents follow a wave of bomb scares that affected at least 25 flights across Europe on Thursday. EU officials have said it is too early to determine whether the incidents are linked.