The honest answer to when you should fly Kathmandu to Vientiane is mostly about weather and demand at the far end. On three years of daily observations at the arrival airport, Jan-Feb, Nov-Dec gives the most comfortable combination of temperature and rainfall in Vientiane.
Averages below come from three full years of daily readings at Vientiane’s main airport, not from a seasonal generalisation. The warmest month is April (average high 36°C), the coolest is January (average low 17°C), and the wettest is September (503 mm).
| Month | Avg high | Avg low | Rainfall | Wet days | Kathmandu high |
|---|---|---|---|---|---|
| January good | 27°C | 17°C | 10 mm | 2 | 18°C |
| February good | 31°C | 20°C | 11 mm | 2 | 20°C |
| March | 33°C | 22°C | 18 mm | 4 | 22°C |
| April | 36°C | 25°C | 62 mm | 7 | 26°C |
| May | 33°C | 25°C | 246 mm | 24 | 26°C |
| June | 32°C | 25°C | 348 mm | 26 | 27°C |
| July | 30°C | 25°C | 452 mm | 27 | 27°C |
| August | 31°C | 25°C | 398 mm | 28 | 27°C |
| September | 30°C | 24°C | 503 mm | 29 | 27°C |
| October | 31°C | 23°C | 199 mm | 16 | 24°C |
| November good | 30°C | 21°C | 35 mm | 5 | 21°C |
| December good | 28°C | 19°C | 5 mm | 0 | 18°C |
Climate data: Open-Meteo reanalysis archive.
Vientiane runs 1.3 hours ahead of Kathmandu. Travelling east is the harder direction to adjust to, so if the trip is short, an early departure that lands in daylight is worth more than a marginally cheaper overnight.
We publish observed fares for this route when we have them, and say nothing when we do not — there is no estimate on this page. What holds regardless of the route:
Midweek departures are consistently cheaper than Friday and Sunday on most routes, because that is where demand sits rather than because of any pricing trick. Where we have observed fares for Kathmandu–Vientiane, the weekday breakdown appears further down this page; where we do not, we leave it out rather than estimate it.
Top-rated tours and experiences in Vientiane, ranked by traveller rating. Prices are per person and change with date and group size.
Nightly rates in Vientiane for a sample two-night stay for two adults from 29 Sep 2026, cheapest first. Rates move with your dates — check availability for a live quote.
