The Third-Country Rule for China Transit: A→B→C Explained

The short answer

China’s visa-free transit is for passing through, not for a round trip. Your journey must be A → China → C, where C is different from A, and you must hold a confirmed onward ticket to that third country or region. If you plan to fly home the way you came, the rule does not apply.

The A→B→C rule

Leg	Meaning
A	The country or region you depart from
B	China, where you transit
C	A different country or region you travel on to

The point is that you are genuinely in transit. The onward destination must not be the place you arrived from.

What qualifies, and what does not

Route	Qualifies?	Why
London → Shanghai → Tokyo	Yes	C differs from A
New York → Beijing → Bangkok	Yes	C differs from A
London → Shanghai → Hong Kong	Generally yes	Hong Kong is a separate region
London → Shanghai → London	No	Round trip, C equals A
New York → Beijing → Chicago	No	Return to the same country
Paris → Beijing → Shanghai → Tokyo	Usually yes, with care	Domestic legs are allowed within the permitted areas; your onward international ticket must be to a third country
Tokyo → Shanghai → Taipei	Generally yes	Taiwan is a separate region
Taipei → Beijing → Taipei	No	You return to where you came from
London → Shanghai → Hong Kong, then Hong Kong → London	Generally yes	The leg out of China goes to Hong Kong; where you fly after that does not change it
Hong Kong → Shanghai → Hong Kong	No	C equals A
Seoul → Beijing → Macau	Generally yes	Macau counts separately from Hong Kong and Taiwan

The test is always the same pair of places: where you flew in from and where your ticket out of China goes. A stop somewhere else afterwards, such as Hong Kong on the way home to London, does not turn the trip into a round trip.

Do Hong Kong, Macau, and Taiwan count?

Generally yes, each as a separate region. The NIA’s own wording is transit “to third countries or regions”, and Hong Kong, Macau, and Taiwan each count independently. Routes like Shanghai → Hong Kong or Beijing → Macau are commonly used to satisfy the onward-leg requirement.

• Taiwan: Tokyo → Shanghai → Taipei generally qualifies. Taipei → Shanghai → Taipei does not.
• Hong Kong: London → Shanghai → Hong Kong generally qualifies, even if Hong Kong is a stop on your way home. Hong Kong → Shanghai → Hong Kong does not.
• Macau: an onward flight to Macau generally qualifies, unless Macau is where you flew in from.

Because this is decided by border officers and airline check-in staff, confirm your exact itinerary with your airline and the NIA before you rely on it.

Separate tickets are fine

You do not need one single booking. A separate onward ticket works, but you must be able to show it: a booking confirmation with a date and flight number. Keep a screenshot on your phone, since airport Wi-Fi may need an SMS code you cannot receive. Airlines check carefully because they are penalized if they board an ineligible passenger.

The related requirement: permitted areas

Satisfying A→B→C is necessary but not sufficient. You must also:

• Enter and exit through a designated port.
• Stay within the permitted areas for the participating provinces.
• Depart within the allowed time (240 hours for the transit policy).

See the ports and permitted areas reference for the details.

Bottom line

A→B→C is the rule that trips up the most travelers: it is not enough to have a long stop, your onward ticket must go to a different country or region. If you are returning the same way you came, use 30-day visa-free entry if you qualify, or apply for a visa.