I used HTS for both ways airport transfer services. I booked on the day and still has cars available.
You just need to send the email, and they will respond back quick. Then just payment online, USD 12 for 4 seaters, or USD18 for 7 seaters. They will confirm right away after received the online payment.
You can WhatsApp them anytime, the respond time is quick also.
Nice clean cars, good drivers, and be at the place on time.
Highly recommend for airport transportation, especially Hanoi taxi meter is more like "human control" ones. You never know how much a taxi charge you.
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