Heathrow → Shannon flight delays
HEATHROW → SHANNON · all airlines · 2,078 flights · May 2025 – April 2026 · source: UK CAA
This route is delayed
25%of the time, by +43 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
75%
Delayed 3h+
0.1%
Cancelled
0.7%
Avg when late
+43m
Were you delayed 3+ hours on this route?
About 0.1% of these flights land 3h+ late. If yours did, under UK261 you could be owed up to £520 — and you can claim it yourself for free. Check if you're owed →
When does HEATHROW → SHANNON run late?
26
16
19
16
16
20
26
21
38
26
25
45
J
F
M
A
M
J
J
A
S
O
N
D
Delays peak in December (45% late).
Frequently asked
How often is the Heathrow to Shannon flight delayed?
About 25% of HEATHROW → SHANNON flights arrive late (15+ minutes), by an average of 43 minutes when they do, based on 2,078 flights in May 2025 – April 2026.
What is the worst month for delays on HEATHROW → SHANNON?
December is the worst, with 45% of flights delayed, while February is the most reliable at 16%.
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