Heathrow → Chicago (O'Hare) flight delays
HEATHROW → CHICAGO-O-HARE · all airlines · 5,853 flights · May 2025 – April 2026 · source: UK CAA
This route is delayed
26%of the time, by +69 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
74%
Delayed 3h+
1.7%
Cancelled
1.9%
Avg when late
+69m
Were you delayed 3+ hours on this route?
About 1.7% 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 → CHICAGO-O-HARE run late?
24
15
16
20
29
28
33
33
23
30
26
32
J
F
M
A
M
J
J
A
S
O
N
D
Delays peak in July (33% late).
Which airline is most punctual on HEATHROW → CHICAGO-O-HARE?
Frequently asked
How often is the Heathrow to Chicago (O'Hare) flight delayed?
About 26% of HEATHROW → CHICAGO-O-HARE flights arrive late (15+ minutes), by an average of 69 minutes when they do, based on 5,853 flights in May 2025 – April 2026.
Which airline is most punctual on HEATHROW → CHICAGO-O-HARE?
United Airlines, delayed 22% of the time — the best of the 3 airlines flying this route.
What is the worst month for delays on HEATHROW → CHICAGO-O-HARE?
July is the worst, with 33% of flights delayed, while February is the most reliable at 15%.
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