The best price found from United States to Daejeon is on August 12th, 2017, travelling with Hainan Airlines. See more options, compare prices and book: search flights.
The nearest airport is at Cheongju, 40km north. Trains (₩3900, one hour) run 11 times a day from Daejeon station to Cheongju Airport station. Buses run from Dongdaejeon intercity bus terminal to the airport (₩3700, 45 minutes, five daily). There are also buses to Incheon International Airport (₩15,900, three hours, every 20 minutes).