i
Photo: Unsplash.
Seattle from Seoul
8,322 km, about 11h 04m in the air. Every month scored for the weather at Seattle and for the holidays that crowd it out at both ends.
- JanJSeattle in January: avoid
- FebFSeattle in February: avoid
- MarMSeattle in March: ok
- AprASeattle in April: ok
- MayMSeattle in May: good, busy
- JunJSeattle in June: sweet spot, busy
- JulJSeattle in July: sweet spot, busy
- AugASeattle in August: sweet spot, busy
- SepSSeattle in September: ok, busy
- OctOSeattle in October: ok
- NovNSeattle in November: avoid
- DecDSeattle in December: avoid
- Sweet spot
- Good
- OK
- Avoid
- Busy
Plan this trip
Each site opens on its own search: choose your dates there. A few open on their home page, where you type the place too.
Flights from Seoul
Book with the airline
Where to stay
Book direct
Luxury
Things to do
Car hire
Rent direct
Travel insurance
Check whether your bank card or home insurance already covers this trip.
If the trip needs a visa, the travel agent or visa centre usually sells the cover it asks for.
Mobile data (eSIM)
Your own plan's EU roaming may already cover this.
Renting a pocket Wi-Fi is the other common way to stay connected.
These are sites people in book with. Each opens in a new tab, on the site's own pages. Some pay us a commission if you book, at no extra cost to you; most pay nothing, and what a site pays never decides whether it is listed or where.
Month by month from Seoul
No fare history on ICN–SEA yet, so this ranking is climate and crowds only. The price column fills in as the scanner collects.
| Month | Max °C | Rain days | Crowds | Verdict | Why |
|---|---|---|---|---|---|
| Jan | 8° | 16d | 80 | avoid | monsoon: 16 rainy days, 188mm |
| Feb | 7° | 13d | 80 | avoid | 7C max, 13 rainy days |
| Mar | 11° | 14d | 100 | ok | 11C max, 14 rainy days |
| Apr | 14° | 12d | 100 | ok | 14C max, 12 rainy days |
| May | 18° | 9d | 62 | goodbusy | busier than usual |
| Jun | 21° | 7d | 65 | sweet spot busy | busier than usual |
| Jul | 25° | 2d | 65 | sweet spot busy | busier than usual |
| Aug | 25° | 4d | 65 | sweet spot busy | busier than usual |
| Sep | 21° | 8d | 55 | okbusy | busier than usual |
| Oct | 15° | 11d | 80 | ok | 15C max, 11 rainy days |
| Nov | 10° | 16d | 80 | avoid | monsoon: 16 rainy days, 189mm |
| Dec | 8° | 17d | 80 | avoid | monsoon: 17 rainy days, 213mm |
Rain days are the days with at least 2 mm of rain.
Crowds is a score out of 100 where higher is quieter. It counts public-holiday clusters in KR as well as at Seattle, which is why this table differs from the same one read from another country. A busy month is a crowded one, not a bad one — usually it is crowded because the weather is good. Crowds alone never make a month “avoid”: that is reserved for weather worth skipping.
How busy it gets
Getting there
| Nonstop flight | 4 airlines |
|---|
Nonstop routes from Wikipedia's airport articles (CC BY-SA 4.0), roads from OpenRouteService, ferries from OpenStreetMap contributors (ODbL). Times are typical, not a schedule, and none of this is a fare — the searches below are where prices live.
Seattle from anywhere · everywhere from Seoul
Some links above are affiliate links: if you book through one, we may earn a commission at no extra cost to you. It does not affect the scores on this page, which are computed from climate, holiday and fare data before any link is built.