Heathrow → Seattle (Tacoma) flight delays
HEATHROW → SEATTLE-TACOMA · all airlines · 2,583 flights · May 2025 – April 2026 · source: UK CAA
This route is delayed
19%of the time, by +45 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
81%
Delayed 3h+
0.2%
Cancelled
0.6%
Avg when late
+45m
Were you delayed 3+ hours on this route?
About 0.2% 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 → SEATTLE-TACOMA run late?
21
7
11
11
22
18
22
17
28
18
21
21
J
F
M
A
M
J
J
A
S
O
N
D
Delays peak in September (28% late).
Which airline is most punctual on HEATHROW → SEATTLE-TACOMA?
Frequently asked
How often is the Heathrow to Seattle (Tacoma) flight delayed?
About 19% of HEATHROW → SEATTLE-TACOMA flights arrive late (15+ minutes), by an average of 45 minutes when they do, based on 2,583 flights in May 2025 – April 2026.
Which airline is most punctual on HEATHROW → SEATTLE-TACOMA?
Virgin Atlantic Airways Ltd, delayed 10% of the time — the best of the 3 airlines flying this route.
What is the worst month for delays on HEATHROW → SEATTLE-TACOMA?
September is the worst, with 28% of flights delayed, while February is the most reliable at 7%.
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