Major airports in two European countries have been forced to shut for hours due to unauthorised drones flying through their airspace.

Operations at Copenhagen Airport were suspended for about four hours from 8.30pm last night (4.30am today AEST) after two or three "large" and "unidentified" drones were spotted nearby.

According to a spokesperson, the aircraft were still in the area three hours later.

The airport reopened shortly after midnight but travellers to and from the Danish capital were warned of lingering delays more than 13 hours later.

Meanwhile, Oslo Airport was also shut down due to a drone sighting.

Police in the Norwegian capital said they had arrested two foreign nationals for flying drones over a restricted area.

There was no indication that the incident was connected

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