Osaka vs Seoul Marathon — Key Differences
Compare the Osaka and Seoul Marathons side by side — course profile, weather, field size, qualification, and atmosphere to help you choose your next race.
Quick Comparison
| Feature | 2027 Osaka Marathon - Feb 28 | 2026 Seoul Marathon - Mar 15 |
|---|---|---|
| Country/Region | Japan | South Korea |
| Month | February | March |
| Avg Temperature | 4-10°C | 5-12°C |
| Course Type | Flat | Flat |
| Elevation | ~15m | ~30m |
| Field Size | 32,000 | 25,000 |
| Entry | Lottery | Open |
| World Major | No | No |
| BQ Course | Yes | Yes |
| Crowd Support | Excellent | Good |
Detailed Comparison
Osaka and Seoul are both East Asian winter-spring marathons run in similar conditions — Osaka in February (4-10°C) and Seoul in March (4-12°C). Both are flat to mostly flat with large fields of approximately 35,000 runners. The key difference is entry: Osaka requires a time-qualifying standard, making it one of the more selective marathons in Asia, while Seoul offers open registration accessible to all runners.
Osaka's flat course (~25m elevation) through Naniwa and along the Yodo River is a proven fast course favored by Japanese runners chasing personal bests. Seoul's mostly flat route (~50m elevation) follows the Han River with slightly more variation. Both courses are suitable for runners targeting a Boston qualifying time, though Osaka's stricter flatness gives it a marginal advantage for pure speed.
The race-day atmosphere reflects each city's character. Osaka is known as Japan's kitchen and entertainment capital — expect organized, enthusiastic crowds and world-class post-race food. Seoul's marathon winds past historic palaces and modern skyscrapers, with K-pop music stations adding energy along the Han River. If you have a qualifying time and want an elite-caliber flat course, Osaka rewards your fitness. If you want an open-entry marathon with a blend of ancient and modern Korean culture, Seoul is an excellent choice.
Explore Each Marathon
2027 Osaka Marathon - Feb 28
Live countdown, race info, and training tools.
View Countdown →2026 Seoul Marathon - Mar 15
Live countdown, race info, and training tools.
View Countdown →Frequently Asked Questions
Which is faster, Osaka or Seoul Marathon?
Osaka features a flat course while Seoul has a flat profile. The Seoul course is generally well-suited for fast times.
How do I enter the Osaka Marathon vs Seoul Marathon?
Osaka Marathon uses a Lottery entry system with a field of 32,000 runners. Seoul Marathon uses Open with 25,000 spots. Plan your entry strategy using our Marathon Lottery Calculator.
What is the best weather for running, Osaka or Seoul?
Osaka in February averages 4-10°C. Seoul in March averages 5-12°C. Use our Dew Point Calculator and Heat Adjustment Calculator to plan for race-day conditions.
Can I qualify for Boston at Osaka or Seoul?
Both the Osaka and Seoul Marathons are BQ-eligible courses. Use our Pace Calculator to determine your BQ target pace.
Which marathon has better crowd support?
Osaka is known for excellent crowd support, while Seoul offers good spectator atmosphere. Both races create memorable experiences. Plan your spectator strategy with our Spectator Planner.
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