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Seoul to Ulaanbaatar in December 2026 GMP, ICN → UBN

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

For departures in December 2026, the cheapest return found recently is $310 with Jeju Air, 8 Dec – 15 Dec, found today.

Return

In December 2026, the cheapest return fare on each of 15 departure dates is usually $417 to $452. Across all 27 departure dates we hold on this route, it is usually $386 to $450. Of the 3 months with enough return fares to compare, 1 is usually cheaper than December 2026.

Cheapest return found recently

$310

8 Dec – 15 Dec · Jeju Air

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

out nonstop, back nonstop

found today

See prices for these datesCheck today's price

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

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
8 Dec – 15 Dec$310Jeju Airout nonstop, back nonstopfound todaySee prices for these dates
1 Dec – 31 Dec$364Jeju Airout nonstop, back nonstopfound 3 days agoSee prices for these dates
6 Dec – 13 Dec$401Jeju Airout nonstop, back nonstopfound todaySee prices for these dates
26 Dec – 31 Dec$413Aero Mongoliaout nonstop, back nonstopfound 3 days agoSee prices for these dates
20 Dec – 11 Jan 2027$421Jeju Airout nonstop, back nonstopfound 3 days agoSee prices for these dates

Every date we hold

15 departure dates

1 Dec – 31 Dec: $364, found 3 days ago4 Dec – 4 Dec: $450, found 6 days ago5 Dec – 5 Dec: $442, found today6 Dec – 13 Dec: $401, found today8 Dec – 15 Dec: $310, found today15 Dec – 22 Dec: $538, found 6 days ago17 Dec – 18 Dec: $453, found today18 Dec – 19 Dec: $490, found 3 days ago19 Dec – 9 Jan 2027: $422, found yesterday20 Dec – 11 Jan 2027: $421, found 3 days ago21 Dec – 9 Jan 2027: $429, found 3 days ago25 Dec – 4 Jan 2027: $492, found 5 days ago26 Dec – 31 Dec: $413, found 3 days ago28 Dec – 13 Jan 2027: $429, found 5 days ago29 Dec – 9 Jan 2027: $425, found 2 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec – 31 Dec$364Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
4 Dec – 4 Dec$450Korean AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
5 Dec – 5 Dec$442Korean AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound todaySee prices for these dates
6 Dec – 13 Dec$401Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound todaySee prices for these dates
8 Dec – 15 Dec$310Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound todaySee prices for these dates
15 Dec – 22 Dec$538Air ChinaGimpo International Airport (GMP) → Chinggis Khaan International Airport (UBN)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
17 Dec – 18 Dec$453Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back 1 stopfound todaySee prices for these dates
18 Dec – 19 Dec$490MIAT Mongolian AirlinesIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
19 Dec – 9 Jan 2027$422Aero MongoliaIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound yesterdaySee prices for these dates
20 Dec – 11 Jan 2027$421Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
21 Dec – 9 Jan 2027$429Aero MongoliaIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
25 Dec – 4 Jan 2027$492Korean AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
26 Dec – 31 Dec$413Aero MongoliaIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
28 Dec – 13 Jan 2027$429Aero MongoliaIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
29 Dec – 9 Jan 2027$425Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 2 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $310.

October 2026From $3873 departure dates25 Oct – 24 Nov · found 3 days agoSee prices for these dates
November 2026From $3466 departure dates26 Nov – 31 Dec · found 2 days agoSee prices for these dates
December 2026From $310Cheapest seen15 departure dates8 Dec – 15 Dec · found todaySee prices for these dates
February 2027From $4501 departure date7 Feb 2027 – 23 Feb 2027 · found 2 days agoSee prices for these dates
March 2027From $4381 departure date8 Mar 2027 – 22 Mar 2027 · found 3 days agoSee prices for these dates
July 2027From $4611 departure date5 Jul 2027 – 19 Jul 2027 · found todaySee prices for these dates

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