Business Class Flights from San Francisco to Seoul

Seoul (SEL) ranges from cold, dry winters (January −1°C/30°F with 23 mm) to hot, humid summers (August 26°C/79°F with 290 mm).

The monsoon peaks in July (360 mm) and August (290 mm); for outdoor-heavy itineraries, May (98 mm) or October (60 mm) are safer bets.

Comfortable sightseeing lines up with fare shoulders: April–May average 12–17°C (54–63°F) with 82–98 mm of rain, while September–October average 21–14.5°C (70–58°F) with 170–60 mm.

Winter is driest but brisk; January–February bring 23–28 mm of precipitation and near-freezing temperatures, matching some of the lowest fare months if you pack for the cold.

If traveling in July–August, plan buffer time for airport transfers and consider morning arrivals to cushion for weather-related delays.

For San Francisco (SFO) to Seoul (SEL), prices typically bottom out 60–90 days before departure; at 75 days the index is 85, about 15% cheaper than booking on day 1 (100).

Buying very early is rarely optimal here: 150 days out averages 104, which is 19 points higher than the 75-day low.

Inside 30 days, fares firm up: 30 days 94, 14 days 99, and day 1 at 100; last-minute upgrades may appear, but base fares usually rise.

BusinessClass.com’s premium traveler community often purchases 45–60 days out to balance better seat maps with roughly 10–15% savings versus day-of pricing.

Set alerts near 110–100 days out, then aim to buy as prices dip into the 90–60 day band; avoid purchasing more than four months ahead unless dates are inflexible.

For San Francisco (SFO) to Seoul (SEL), the priciest months are June–August and December at roughly 105–107, while January sits at 90; that’s a 17-point gap between July (107) and January (90).

Cherry blossom travel in April averages 106, about 6% above the yearly norm; shifting to late May (102) can trim around 4 points while keeping spring weather.

Shoulder months September–October run just under average at 98–96 and usually offer better seat availability than summer peaks.

Mid-winter is soft: January 90, February 92, and November 94; moving a summer trip to November cuts the price level by about 13 points versus July (107).

If you must fly during school holidays or year-end, budget for a 5–7% uplift versus the annual average and start monitoring fares earlier to avoid late spikes.