Seoul vs Tokyo Marathon — Side-by-Side Guide

Compare the Seoul and Tokyo Marathons — two of Asia's premier races. Course speed, weather, entry process, and cultural experience compared.

Quick Comparison

Feature 2026 Seoul Marathon - Mar 15 2027 Tokyo Marathon - Mar 7
Country/RegionSouth KoreaJapan
MonthMarchMarch
Avg Temperature5-12°C8-12°C
Course TypeFlatFlat
Elevation~30m~40m
Field Size25,00038,000
EntryOpen EntryLottery
World MajorNoYes
BQ CourseYesYes
Crowd SupportGoodExcellent

Detailed Comparison

Seoul and Tokyo are both March marathons in East Asia, offering cool conditions ideal for fast racing. The critical difference is accessibility: Seoul has open entry while Tokyo requires a competitive lottery. For runners who cannot win Tokyo's ballot, Seoul is an excellent alternative in the same region and season.

Seoul's flat course along the Han River and through downtown is consistently fast, with conditions similar to Tokyo. The field is smaller (25,000 vs 38,000), which means less congestion. Tokyo has the prestige of a World Marathon Major, superior organization, and larger, more enthusiastic crowds. Seoul's crowd support has improved significantly in recent years but does not yet match Tokyo's sustained kilometer-by-kilometer encouragement.

For runners collecting World Marathon Majors, Tokyo is essential. For runners who want a fast Asian spring marathon without the lottery gamble, Seoul delivers a comparable racing experience at a fraction of the entry difficulty.

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Frequently Asked Questions

Which is faster, the Seoul or Tokyo Marathon?

Both are fast Asian spring marathons, but Tokyo's course is slightly flatter with ~40m of elevation versus Seoul's ~50m. Tokyo also attracts a deeper elite field as a World Marathon Major. Seoul's course along the Han River is largely flat and capable of producing fast times. Use our Pace Calculator to set your target splits for either race.

Is it easier to get into the Seoul or Tokyo Marathon?

Seoul is significantly easier. It uses open registration with time-qualifying tiers, and international runners with a proven marathon time can generally secure a spot. Tokyo's international lottery has roughly 10:1 odds with no guaranteed entry path for most runners. If securing a spot is important, Seoul is the more accessible choice.

How does the weather compare at Seoul vs Tokyo in March?

Both race in March, but Seoul is noticeably colder at 4-12°C compared to Tokyo's 8-12°C. Seoul's continental climate means mornings can dip near freezing, while Tokyo's maritime influence keeps temperatures milder. Runners who prefer cold conditions may favor Seoul, while those seeking moderate cool weather will prefer Tokyo. Plan your race-day gear with our What to Wear tool.

Is the Seoul Marathon a World Marathon Major?

No, Seoul is not a World Marathon Major, while Tokyo is one of the seven WMM races. However, Seoul has been growing rapidly in international reputation and quality. Both courses are BQ-eligible, and Seoul's fast, flat profile makes it a strong alternative for runners who cannot get into Tokyo's lottery. Check your BQ target with our Boston Qualifying Calculator.

Which offers a better race experience, Seoul or Tokyo?

Tokyo is widely considered one of the best-organized marathons in the world, with legendary aid stations offering local snacks, impeccable crowd support, and a course that showcases the city's iconic landmarks. Seoul offers a modern, scenic route along the Han River with enthusiastic Korean crowds and excellent post-race celebration. Tokyo edges ahead on prestige, but Seoul delivers exceptional value with easier entry.

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