Best way to travel between Seoul, South Korea and Jeju si

A: Seoul, South Korea

B: Jeju si

Travel Modes: Price; Distance; Duration; CO2

bus: $64.0; 549.12 km; 10h 30mins; 16.47 kgs

train: $91.0; 571.2 km; 10h 51mins; 30.27 kgs

drive: $106.0; 534.29 km; 7h 51mins; 68.39 kgs

flight: $149.0; 515.55 km; 5h 23mins; 55.68 kgs

Tranport	Distance	Time(hrs)	Cost(local)	Cost(usd)
Bus	549.12 km	10h 30mins	67,908 KRW	64.0
Train	571.2 km	10h 51mins	96,556 KRW	91.0
Drive	534.29 km	7h 51mins	112,472 KRW	106.0
Flight	515.55 km	5h 23mins	158,098 KRW	149.0

Take Train from Euljiro 4-ga Station to Terminal Express Bus Station: Time: 17mins Cost: 1,061 KRW; $ 0.9 - 1.1 USD CO2 Emission: 0.47 kgs
Take Bus from Seoul Central City Bus Terminal to Wando Bus Terminal: Time: 5h 12mins Cost: 29,710 KRW; $ 25.2 - 30.8 USD CO2 Emission: 13.42 kgs
Take Ferry from Wando to Jeju: Time: 2h 57mins Cost: 37,137 KRW; $ 31.5 - 38.5 USD CO2 Emission: 12.02 kgs

Source: Rome2rio

Mode of travel comparision chart

The best and cheapest way to get from Seoul, South Korea and Jeju si is to travel by bus, which will cost about 67,908 KRW or 57.60 USD.