The honest answer to when you should fly Helsinki to Seoul is mostly about weather and demand at the far end. On three years of daily observations at the arrival airport, May-Jun, Sep-Oct gives the most comfortable combination of temperature and rainfall in Seoul.
Averages below come from three full years of daily readings at Seoul’s main airport, not from a seasonal generalisation. The warmest month is August (average high 29°C), the coolest is January (average low -5°C), and the wettest is July (332 mm).
| Month | Avg high | Avg low | Rainfall | Wet days | Helsinki high |
|---|---|---|---|---|---|
| January | 1°C | -5°C | 20 mm | 4 | -4°C |
| February | 4°C | -2°C | 27 mm | 5 | -3°C |
| March | 9°C | 2°C | 42 mm | 7 | 5°C |
| April | 15°C | 8°C | 71 mm | 6 | 9°C |
| May good | 19°C | 13°C | 115 mm | 9 | 17°C |
| June good | 24°C | 18°C | 99 mm | 7 | 20°C |
| July | 27°C | 23°C | 332 mm | 18 | 23°C |
| August | 29°C | 25°C | 222 mm | 17 | 20°C |
| September good | 26°C | 21°C | 201 mm | 11 | 18°C |
| October good | 19°C | 13°C | 90 mm | 10 | 9°C |
| November | 12°C | 5°C | 60 mm | 6 | 4°C |
| December | 4°C | -2°C | 45 mm | 7 | 1°C |
Climate data: Open-Meteo reanalysis archive.
Seoul runs 6 hours ahead of Helsinki. 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 Helsinki–Seoul, 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 Seoul, ranked by traveller rating. Prices are per person and change with date and group size.
Nightly rates in Seoul 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.
| Airline | Code | Role |
|---|---|---|
| Finnair | AY | Operates |
