which airport? I'm not sure if you can take a train, try busses
for sabiha gökçen, there are E9 E10 E11 and more, they go into the airport. same for the new airport but I have never been there.
"How much is it from the airport to Istanbul by taxi?" question is not valid, btw. airports are already in istanbul, depends on where you want to go. there's no 'istanbul city centre' or something, everywhere is centre :)
for busses, you can visit iett's site for taxi, download "bi' taksi" app, you can see approximate prices there, and you can call a taxi
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