Which Cork flights to the UK actually arrives on time? 60 days of data has the answer

Cork Airport handled 3.46 million passengers in 2025 — its busiest year on record. Of those, nearly 1.5 million were travelling to or from Great Britain, up 11% on the previous year according to daa's official December 2025 statistics. London Heathrow remains the single busiest route from Cork, with Manchester and Bristol among the fastest growing UK routes. With that volume of passengers flying to the UK every year, knowing which flights are most likely to arrive on time is worth knowing.

I assumed the Cork to UK flight options were limited enough that punctuality probably didn't vary much between them. The data says otherwise — and the gaps are bigger than I expected.

The data behind this analysis

60 days of historical data
11 flights across five UK destinations: London Heathrow (LHR), London Gatwick (LGW), London Luton (LTN), Manchester (MAN) and Bristol (BRS)
Flights are classified as on-time if they arrive within 15 minutes of scheduled arrival
Only flights with at least 30 tracked journeys are included to ensure the results are statistically meaningful

The most punctual Cork flights

Rank	Route	Approx. Departure	On-Time %	Flights Analysed
1	Cork → Heathrow	4:05pm	98.3%	60
2	Cork → Heathrow	5:35pm	96.2%	53
3	Cork → Gatwick	4:10pm	95.2%	62
4	Cork → Heathrow	11:55am	88.7%	62
5	Cork → Bristol	5:50pm	83.0%	53

The afternoon Cork to Heathrow departure at 4:05pm is the standout performer — arriving on time 98.3% of the time across 60 tracked flights. If punctuality is your priority flying out of Cork, this is your flight.

Second place goes to the 5:35pm Heathrow departure at 96.2%, making the late afternoon window on this route remarkably reliable overall. Cork to Gatwick's afternoon Ryanair service at 4:10pm rounds out the top three at 95.2% — a strong result for a budget carrier and worth considering if Gatwick suits your onward journey better than Heathrow.

What surprised me in the data

The morning penalty is stark. The 7:40am Cork to Heathrow departure arrives on time just 80.7% of the time — nearly 18 percentage points behind the same route's afternoon flight. If you're booking an early Cork to London trip hoping to maximise your day in the city, factor in a realistic chance of a delay eating into those plans.

Cork to Manchester tells a different story entirely. Both Ryanair services on this route — the 7:25am and the 10:40pm — sit at around 80-82% on-time. Neither is terrible, but neither stands out either. If you're flexible on timing for a Cork to Manchester trip, there isn't a clear "safe" choice the way there is on the Heathrow route.

The late night Cork to Manchester departure at 10:40pm is worth flagging specifically — an 80% on-time rate on a late flight means roughly one in five passengers is arriving even later than planned. Something to consider if you have an early start the next morning.

What this means for your next Cork flight

The gap between the best and worst performing Cork flights is significant — nearly 18 percentage points separates the most and least punctual options on the Heathrow route alone.

Afternoon departures consistently outperform morning ones across all routes out of Cork. The pattern is clear enough that it's worth checking before you book rather than just picking whatever time suits your schedule.

The full Cork on-time rankings are live and updated daily at routeranking.com — check them before you book.

What's next Cork to Manchester and Cork to Bristol will get their own deep dives as more data accumulates. Shannon and Belfast routes are also in the pipeline.

Source: daa Monthly Statistics — December 2025. Available at daa.ie.