There were 16 cases of ambulances taking over an hour to reach life-threatening emergencies across Cavan and Monaghan in the first six months of 2021.
The figures are part of a national total of 300 emergency calls that took 60 minutes or more for services to arrive on the scene.
Long distance travel was the reason given for the delays facing the majority of the national and local call-outs.
Cavan faced the highest levels of delay in the region, with ambulances arriving at 12 life-threatening incidents over an hour after they were called.
In one case, an ambulance attended the scene almost two hours after the call, due to the original service being re-routed to a more serious emergency.
Four incidents in Monaghan saw a waiting time of over an hour for emergency services to arrive, with long distances and higher priority calls responsible.
According to Freedom of Information figures from RighttoKnow.ie, other reasons given for lengthy delays in reaching patients included bad weather conditions, decontaminating an ambulance, and problems with accurate directions.
