The honest answer to when you should fly Osaka to Philadelphia is mostly about weather and demand at the far end. On three years of daily observations at the arrival airport, Apr-May, Sep-Oct gives the most comfortable combination of temperature and rainfall in Philadelphia.
Averages below come from three full years of daily readings at Philadelphia’s main airport, not from a seasonal generalisation. The warmest month is July (average high 31°C), the coolest is January (average low -4°C), and the wettest is March (132 mm).
| Month | Avg high | Avg low | Rainfall | Wet days | Osaka high |
|---|---|---|---|---|---|
| January | 3°C | -4°C | 85 mm | 8 | 9°C |
| February | 6°C | -3°C | 64 mm | 9 | 10°C |
| March | 14°C | 3°C | 132 mm | 9 | 13°C |
| April good | 19°C | 8°C | 92 mm | 9 | 19°C |
| May good | 23°C | 13°C | 119 mm | 14 | 23°C |
| June | 30°C | 19°C | 77 mm | 10 | 26°C |
| July | 31°C | 22°C | 125 mm | 14 | 32°C |
| August | 29°C | 19°C | 116 mm | 12 | 32°C |
| September good | 26°C | 16°C | 85 mm | 10 | 30°C |
| October good | 21°C | 10°C | 52 mm | 6 | 23°C |
| November | 14°C | 4°C | 68 mm | 8 | 17°C |
| December | 7°C | -1°C | 117 mm | 9 | 12°C |
Climate data: Open-Meteo reanalysis archive.
Philadelphia runs 13 hours behind Osaka. 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 Osaka–Philadelphia, the weekday breakdown appears further down this page; where we do not, we leave it out rather than estimate it.
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