I am wondering how much it should cost from Hanoi- Noi Bai international airport to Hanoi Hilton Opera Hotel. I contact the Noibai Airport Taxi at and they quote me $ 17 usd for a 4 seats car or $ 19 usd if i choose a 7 seats car. Is it reasonable price please advise. Their online service is very good, i got confirmation voucher from them within 1 hour time. Thank you!