Wales and Asia don't share a border—or a direct route. The shortest practical air corridor connects London Heathrow (LHR) to Beijing Capital (PEK), serving as the de facto Wales–Asia distance proxy.
Asia spans from Istanbul (2,500 mi from London) to Tokyo (5,950 mi). "Distance to Asia" is meaningless without a destination. The LHR–PEK route is simply the highest-frequency long-haul corridor from the UK to East Asia.
For Welsh travelers, the journey begins with a 45-minute hop to London—or a 3-hour drive to Birmingham/Manchester for alternative long-haul departures.