A hot summer is coming in the lowland provinces of northern Vietnam. In order to avoid the early summer heat up to 37-39 degrees, travelers can go back to the Northwest of Vietnam to enjoy the cool air during the flood season in Sapa on terraced fields.
We have the schedule for trains title SP3/SP4 from/to Sapa as below:

SP3 departs at Tran Quy Cap Station (Hanoi Station Gate B) at 22:00 p.m every Friday and arrives at Lao Cai at 06:05 a.m

SP4 departs at Lao Cai Station at 21:40 p.m every Sunday and arrives in Hanoi at 05:30 a.m