Italy’s Defence Ministry said army experts worked to safely remove the bombs from Ciampino airport.
The three bombs weighed around 150kg (330lbs) in total – including 75kg (165lbs) of gunpowder.
They were discovered during maintenance work on the tarmac on Thursday, according to airport operator Aeroporti di Roma.
Flights to Ciampino were being diverted to Rome’s larger Fiumicino airport during the closure, which lasted several hours.
The airport, which is situated southeast of central Rome, is an important hub for many low-cost carriers including Ryanair.
Passengers were evacuated from the airport following the discovery, with many claiming on social media that they had not been told what was going on.
Authorities say the airport has now reopened after the explosives were made safe.