The honest answer to when you should fly Kathmandu to Phoenix is mostly about weather and demand at the far end. On three years of daily observations at the arrival airport, Feb-Mar, Nov-Dec gives the most comfortable combination of temperature and rainfall in Phoenix.
Averages below come from three full years of daily readings at Phoenix’s main airport, not from a seasonal generalisation. The warmest month is July (average high 42°C), the coolest is January (average low 6°C), and the wettest is October (45 mm).
| Month | Avg high | Avg low | Rainfall | Wet days | Kathmandu high |
|---|---|---|---|---|---|
| January | 19°C | 6°C | 28 mm | 4 | 18°C |
| February good | 23°C | 10°C | 23 mm | 3 | 20°C |
| March good | 27°C | 13°C | 31 mm | 4 | 22°C |
| April | 30°C | 16°C | 3 mm | 1 | 26°C |
| May | 35°C | 21°C | 3 mm | 1 | 26°C |
| June | 41°C | 27°C | 9 mm | 2 | 27°C |
| July | 42°C | 30°C | 35 mm | 5 | 27°C |
| August | 42°C | 30°C | 20 mm | 3 | 27°C |
| September | 38°C | 25°C | 37 mm | 4 | 27°C |
| October | 33°C | 18°C | 45 mm | 2 | 24°C |
| November good | 24°C | 11°C | 30 mm | 4 | 21°C |
| December good | 21°C | 8°C | 18 mm | 2 | 18°C |
Climate data: Open-Meteo reanalysis archive.
Phoenix runs 12.8 hours behind Kathmandu. Travelling west is generally the easier direction, and you gain usable hours on the day you fly out.
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–Phoenix, the weekday breakdown appears further down this page; where we do not, we leave it out rather than estimate it.
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