How much is a round-trip ticket to Vietnam usually?

pu1. I think it's because it's the peak season in Vietnam because it's winter, but if it's cheap, it's around 400,000 won

2017-12-13

OK

pu2. I made a reservation for 390,000 won in February

2017-12-13

OK

pu3. I went there in November, but I paid 250,000 won for a round trip

2017-12-13

OK