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Ulaanbaatar to Seoul in December 2026 UBN → GMP, ICN

Chinggis Khaan International Airport (UBN) → Gimpo International Airport (GMP), Incheon International Airport (ICN)

For departures in December 2026, the cheapest return found recently is $282 with Jeju Air, 8 Dec – 15 Dec, found 7 hours ago. The cheapest one-way found recently is $133 with Jeju Air, 8 Dec, found 4 hours ago.

Return

In December 2026, the cheapest return fare on each of 23 departure dates is usually $380 to $419. Across all 116 departure dates we hold on this route, it is usually $398 to $421. Of the 10 months with enough return fares to compare, 1 is usually cheaper than December 2026.

Cheapest return found recently

$282

8 Dec – 15 Dec · Jeju Air

Chinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)

out nonstop, back nonstop

found 7 hours ago

See prices for these datesCheck today's price

It is also the cheapest return we hold, of any age.

FareTell may earn a commission when you book through a partner.

The cheapest dates in December 2026

DatesFromAirlineStopsFound
8 Dec – 15 Dec$282Jeju Airout nonstop, back nonstopfound 7 hours agoSee prices for these dates
1 Dec – 15 Dec$291Jeju Airout nonstop, back nonstopfound 5 days agoSee prices for these dates
15 Dec – 22 Dec$293Jeju Airout nonstop, back nonstopfound 6 days agoSee prices for these dates
31 Dec – 5 Jan 2027$348Jeju Airout nonstop, back nonstopfound 6 days agoSee prices for these dates
29 Dec – 5 Jan 2027$368Jeju Airout nonstop, back nonstopfound 6 days agoSee prices for these dates

Every date we hold

23 departure dates

1 Dec – 15 Dec: $291, found 5 days ago2 Dec – 10 Dec: $379, found 6 days ago3 Dec – 11 Dec: $400, found 3 days ago5 Dec – 13 Dec: $405, found 2 days ago6 Dec – 15 Dec: $380, found today7 Dec – 15 Dec: $383, found 2 days ago8 Dec – 15 Dec: $282, found 7 hours ago9 Dec – 16 Dec: $393, found 2 days ago10 Dec – 14 Dec: $388, found 5 days ago12 Dec – 27 Dec: $444, found yesterday13 Dec – 25 Dec: $429, found yesterday15 Dec – 22 Dec: $293, found 6 days ago17 Dec – 28 Dec: $401, found 4 days ago20 Dec – 26 Dec: $433, found 4 days ago21 Dec – 26 Dec: $416, found 4 days ago22 Dec – 9 Jan 2027: $410, found 6 days ago23 Dec – 9 Jan 2027: $392, found 6 days ago24 Dec – 7 Jan 2027: $421, found 4 days ago27 Dec – 9 Jan 2027: $507, found 5 days ago28 Dec – 9 Jan 2027: $390, found 6 days ago29 Dec – 5 Jan 2027: $368, found 6 days ago30 Dec – 10 Jan 2027: $458, found 5 days ago31 Dec – 5 Jan 2027: $348, found 6 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec – 15 Dec$291Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
2 Dec – 10 Dec$379Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
3 Dec – 11 Dec$400MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
5 Dec – 13 Dec$405MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
6 Dec – 15 Dec$380MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound todaySee prices for these dates
7 Dec – 15 Dec$383Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
8 Dec – 15 Dec$282Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 hours agoSee prices for these dates
9 Dec – 16 Dec$393Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
10 Dec – 14 Dec$388Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
12 Dec – 27 Dec$444MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound yesterdaySee prices for these dates
13 Dec – 25 Dec$429MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound yesterdaySee prices for these dates
15 Dec – 22 Dec$293Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
17 Dec – 28 Dec$401Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates
20 Dec – 26 Dec$433Asiana AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates
21 Dec – 26 Dec$416Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates
22 Dec – 9 Jan 2027$410Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
23 Dec – 9 Jan 2027$392Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
24 Dec – 7 Jan 2027$421Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates
27 Dec – 9 Jan 2027$507Air ChinaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
28 Dec – 9 Jan 2027$390Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
29 Dec – 5 Jan 2027$368Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
30 Dec – 10 Jan 2027$458Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
31 Dec – 5 Jan 2027$348Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $282.

October 2026From $39611 departure dates23 Oct – 8 Dec · found todaySee prices for these datesEvery date in October 2026
November 2026From $29120 departure dates26 Nov – 29 Nov · found 5 days agoSee prices for these datesEvery date in November 2026
December 2026From $282Cheapest seen23 departure dates8 Dec – 15 Dec · found 7 hours agoSee prices for these dates
January 2027From $39013 departure dates20 Jan 2027 – 30 Jan 2027 · found 3 days agoSee prices for these datesEvery date in January 2027
February 2027From $4017 departure dates1 Feb 2027 – 3 Mar 2027 · found 3 days agoSee prices for these datesEvery date in February 2027
March 2027From $39712 departure dates8 Mar 2027 – 23 Mar 2027 · found todaySee prices for these datesEvery date in March 2027
April 2027From $4039 departure dates24 Apr 2027 – 3 May 2027 · found 5 days agoSee prices for these datesEvery date in April 2027
May 2027From $4109 departure dates27 May 2027 – 27 Jun 2027 · found 4 days agoSee prices for these datesEvery date in May 2027
June 2027From $4034 departure dates1 Jun 2027 – 2 Jul 2027 · found 5 days agoSee prices for these dates
July 2027From $4095 departure dates14 Jul 2027 – 26 Jul 2027 · found 5 days agoSee prices for these datesEvery date in July 2027
August 2027From $4111 departure date27 Aug 2027 – 1 Sept 2027 · found 5 days agoSee prices for these dates
September 2027From $4012 departure dates16 Sept 2027 – 30 Sept 2027 · found 5 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 12 departure dates is usually $179 to $232. Across all 51 departure dates we hold on this route, it is usually $197 to $235. Of the 7 months with enough one-way fares to compare, 1 is usually cheaper than December 2026.

Cheapest one-way found recently

$133

8 Dec · Jeju Air

Chinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)

nonstop

found 4 hours ago

Open this tripCheck today's price

It is also the cheapest one-way we hold, of any age.

FareTell may earn a commission when you book through a partner.

The cheapest dates in December 2026

DatesFromAirlineStopsFound
8 Dec$133Jeju Airnonstopfound 4 hours agoOpen this trip
31 Dec$154Jeju Airnonstopfound 6 days agoOpen this trip
1 Dec$164Jeju Airnonstopfound 2 days agoOpen this trip
17 Dec$183Jeju Airnonstopfound 4 days agoOpen this trip
22 Dec$217Jeju Airnonstopfound 4 days agoOpen this trip

Every date we hold

12 departure dates

1 Dec: $164, found 2 days ago7 Dec: $232, found 2 days ago8 Dec: $133, found 4 hours ago9 Dec: $228, found today11 Dec: $232, found 6 days ago17 Dec: $183, found 4 days ago22 Dec: $217, found 4 days ago23 Dec: $230, found 4 days ago28 Dec: $232, found 2 days ago29 Dec: $238, found 4 days ago30 Dec: $253, found 2 days ago31 Dec: $154, found 6 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec$164Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
7 Dec$232Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
8 Dec$133Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 4 hours agoOpen this trip
9 Dec$228Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound todayOpen this trip
11 Dec$232MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 6 days agoOpen this trip
17 Dec$183Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 4 days agoOpen this trip
22 Dec$217Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 4 days agoOpen this trip
23 Dec$230Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 4 days agoOpen this trip
28 Dec$232Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
29 Dec$238Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 4 days agoOpen this trip
30 Dec$253Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
31 Dec$154Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 6 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $133.

October 2026From $2061 departure date27 Oct · found 6 days agoOpen this tripEvery date in October 2026
November 2026From $14313 departure dates26 Nov · found yesterdayOpen this tripEvery date in November 2026
December 2026From $133Cheapest seen12 departure dates8 Dec · found 4 hours agoOpen this trip
January 2027From $2293 departure dates16 Jan 2027 · found 5 days agoOpen this tripEvery date in January 2027
February 2027From $2273 departure dates27 Feb 2027 · found yesterdayOpen this tripEvery date in February 2027
March 2027From $1877 departure dates9 Mar 2027 · found 6 days agoOpen this tripEvery date in March 2027
April 2027From $2304 departure dates3 Apr 2027 · found todayOpen this tripEvery date in April 2027
June 2027From $2401 departure date21 Jun 2027 · found 2 days agoOpen this trip
July 2027From $2317 departure dates22 Jul 2027 · found todayOpen this tripEvery date in July 2027

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work