Two flights which were due to land at Ireland West Airport Knock on Saturday morning were diverted to Shannon due to low hanging fog.
Flight FR8142 from Luton, which was due to arrive at 10:30am, and flight FR9813 from Tenerife, due in at 10:35am were both diverted.
As a result, Flight FR8143 to Luton, due off at 10.55am was delayed.
While Flight RK890 from Edinburgh's arrival was delayed until 12:30pm.