This only applies for cities the airport serve.
The furthest I’ve tried was KUL. It’s around 60km from KL Sentral and taking a car would take 1 hour, which makes the flight there (for me) shorter than the car ride.
I have to say, KUL is a great airport. If you’re not going to KL, you can choose to stay in Sepang (the hotel is not at all fabulous). It’s still MUCH better than SZB.
Anyone has tried an airport as far as KUL-KL or further? (The airport MUST primarily serve the city).