Flights from Seoul(SEL) to Chinggis Khaan International Airport(ULN)

At the moment, you can catch a nonstop flight from Seoul to Ulaanbaatar with the following airlines, including: Jeju Air Miat Mongolian Airlines Asiana Airlines Korean Air T'Way Air Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

It takes about 3 hours 40 minutes to fly from Seoul to Ulaanbaatar.

By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seoul to Ulaanbaatar is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

Based on Trip.com data in the past 4 weeks, there is 26 flight per week flying from Seoul to Ulaanbaatar. You can check the weekly schedule for popular airlines on this route below: Miat Mongolian Airlines: -/M/T/W/T/F/S -- OM308 (23:49) Korean Air: S/M/T/W/T/F/S -- KE5867 (13:51) Korean Air: -/M/T/W/T/F/S -- KE5649 (23:49)

The cheapest months to fly from Seoul to Ulaanbaatar is September, when demand for travel is lower.

After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Seoul to Ulaanbaatar on December 7, 2025 with Jeju Air, with prices starting at US$161.

You can land at any one of the following hubs in Ulaanbaatar, with Incheon International Airport to Chinggis Khaan International Airport (ICN-UBN) is by far the most common option on this route: Chinggis Khaan International Airport (UBN) Buyant-Ukhaa International Airport (ULN).

The time difference between Ulaanbaatar and Seoul is 1h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.