score:2
I just tried it from my recent trip from Narita to Shanghai Pudong via Incheon transit. I first asked Asiana Airline via email if it is possible, and they answered I must call by phone to cancel the flight.
Then I called, and the operator said I should cancel the flight at the check-in counter. They seemed to not cancel my flight at that time.
Then at the time of check-in, I asked again and the staff there said I can, as long as I book another return ticket and show him the ticket. I didn't have another ticket, so I immediately tried to search for and booked my return ticket, which is from Incheon to Narita in 6 days after.
He accepted it, but during him checking my (original) ticket, he said that I can change the date of the ticket!. According to his explanation, I didn't have to book another return ticket; I should just change the date of the ticket of the only Incheon to Narita part.
Hmmm... it's too stressful. It meant that I replaced my Asiana ticket with the cheap LCC one and also lost my US$100. Sigh... My ignorance...
But if you want to ditch only the last part of your return flight, it is possible!.
Because I just booked my flight shortly before the departure, and hadn't booked my hotel, I got myself into the investigation room at immigration. You shall be better off expecting a slightly more demanding, scrutinizing inspection.
Upvote:4
Can you do this, yes, but the airline will reprice your ticket based on the new routing and will charge you any difference if the new airfare is higher plus a change fee.
If you try to avoid re-ticketing by not informing the airline, traveling with only carry-on bags and then leave the flight in Beijing, you may have issues with Chinese Immigration, as airlines provide them with advance lists of who is disembarking and who is transiting. Now whether the Immigration officers check each person against that list, I am not certain, which is why I said 'may'.