How reliable is Belfast International?
Flights from BFS avoided significant airline-controlled delay in 76% of 173,859 flights in official UK CAA history — and weather is calmest in Apr. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the airline-controlled delay record at BFS looks like
Avoided 15+ min controlled delay
across 173,859 flights
Source: UK CAA. Origin-grouped, cause-attributed operational history; it is not a direct departure-punctuality measure or a guarantee for any flight.
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Weather by month
When the weather works for you at Belfast
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 97/100 favorability
Roughest month
Most disruptive — low visibility & fog, high winds · 92/100 favorability
The read on BFS
What the numbers say about flying through Belfast International
Across official performance history, flights from Belfast avoided significant airline-controlled delay about 76% of the time over 173,859 flights. That's a respectable but unspectacular operational record. Pair it with a low cancellation rate of 0.7%, so flights here rarely vanish outright. When a departure does run late, the typical delay is around 14 minutes.
On weather, Belfast is an unusually calm-weather airport year-round. April is the calmest stretch for flying, scoring 97 out of 100 for favorable conditions, while January is the most disruptive at 92, driven mainly by low visibility & fog and high winds. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Belfast, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about BFS
- How reliable is Belfast International (BFS)?
- Flights from Belfast avoided significant airline-controlled delay roughly 76% of the time across 173,859 flights of official history — a respectable but unspectacular operational record. The cancellation rate runs about 0.7%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from BFS for good weather?
- April has the calmest flying weather at Belfast International. January is the most disruptive, mainly from low visibility & fog and high winds.
Planning a trip through Belfast?
Score real flights to and from BFS on reliability, weather, and connection safety — not just price.