As I checked, flight tickets are not as cheap as flights between other Turk cities (for example, 16$ from Istanbul to Kayseri). So I'd like to know what other options are available. I did a quick Google search and bus tickets seemed pricy to me (around 30 Euro). A short trip around 2 or 3 hours would be ideal.
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A cheaper trip from Istanbul to Van doesn't seem possible.
However Van is a selectable stop on TCDD (Turkish State Railways) website, there is no train between Istanbul and Van.
Van is one of the furthest cities from Istanbul, so it is likely to be more expensive than Kayseri.
- Istanbul-Kayseri: 611 km.
- Istanbul-Van: 1295 km.