Via Seoul

Watchful 64 /100

London → Tokyo

Near a warning area, but does not cross it

Getting old 8 to 30 days old. May still be right — double-check before you book.

Near a warning area · Weak reroute options · via Seoul · ~13h 10m

Route assessed 12d ago

Why book

Strong alternative to Via Istanbul. ICN hub scores 0/3 (world-class) and the ICN→NRT second leg is only 2.5 hours over clean Pacific airspace — much shorter than IST→NRT. First leg uses the Central Asian corridor.

The catch

Very few backup paths if this route is disrupted

Worth knowing

LHR→ICN uses the Central Asian corridor — check Eurocontrol ATFM status before departure. ICN→NRT transits Korean and Japanese airspace: clean, uncongested, no active advisories.

Watchful 64

London → Tokyo

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Getting old

8 to 30 days old. May still be right — double-check before you book.

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Route strength 57

Other paths · Stop quality

Problems now 71

Closed areas · Flight options

Ranks above Istanbul because ICN hub quality (0/3) beats IST (1/3), and the short second leg creates a cleaner risk profile than the 9-hour IST→NRT segment. Both options share the Central Asian corridor on the first leg.

ICN hub rated 0/3 (world-class) — Incheon is one of the world's most resilient transit hubs with excellent onward connections throughout Northeast Asia.
The ICN→NRT second leg is only ~2.5 hours over clean Korean/Japanese airspace — dramatically shorter and less corridor-exposed than IST→NRT (~9 hours through Central Asia).
LHR→ICN first leg uses the Central Asian corridor. This is the same exposure as the Istanbul option on the first leg — but the hub break at Seoul provides recovery optionality.
Korean Air operates 2 daily LHR→ICN departures with 10+ daily ICN→NRT frequencies — strong second-leg rebooking depth.
Total journey with a normal layover runs approximately 14.5 hours. On a clear day the direct BA/JAL flight is slightly faster; via Seoul offers a better hub.

Other options for this trip

Scores are based on official airspace warnings, added flight time, and how many reroute options exist. This is not a safety rating. Always check with your airline before you book.

For reference only · Verify before booking.

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