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Seoul to Ulaanbaatar flights in December 2026 from $403 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 $403 with Jeju Air, 6 Dec – 6 Dec, found 2 days ago.

Return

In December 2026, the cheapest return fare on each of 7 departure dates is usually $358 to $421. Across all 25 departure dates we hold on this route, it is usually $403 to $432. Of the 5 months with enough return fares to compare, December 2026 is usually the cheapest.

Cheapest return found recently

$403

6 Dec – 6 Dec · Jeju Air

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

out nonstop, back nonstop

found 2 days ago

See prices for these datesCheck today's price

Cheapest we hold, of any age

$325

8 Dec – 10 Dec · Jeju Air

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

out nonstop, back nonstop

found 6 days ago

See prices for these datesCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
8 Dec – 10 Dec$325Jeju Airout nonstop, back nonstopfound 6 days agoSee prices for these dates
7 Dec – 8 Dec$345Asiana Airlinesout nonstop, back nonstopfound 7 days agoSee prices for these dates
12 Dec – 13 Dec$370Asiana Airlinesout nonstop, back nonstopfound 6 days agoSee prices for these dates
22 Dec – 29 Dec$390Jeju Airout nonstop, back nonstopfound 8 days agoSee prices for these dates
6 Dec – 6 Dec$403Jeju Airout nonstop, back nonstopfound 2 days agoSee prices for these dates

Every date we hold

7 departure dates

6 Dec – 6 Dec: $403, found 2 days ago7 Dec – 8 Dec: $345, found 7 days ago8 Dec – 10 Dec: $325, found 6 days ago12 Dec – 13 Dec: $370, found 6 days ago20 Dec – 8 Jan 2027: $453, found 7 days ago22 Dec – 29 Dec: $390, found 8 days ago27 Dec – 3 Jan 2027: $438, found 6 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
6 Dec – 6 Dec$403Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
7 Dec – 8 Dec$345Asiana AirlinesIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
8 Dec – 10 Dec$325Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
12 Dec – 13 Dec$370Asiana AirlinesIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
20 Dec – 8 Jan 2027$453Korean AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
22 Dec – 29 Dec$390Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 8 days agoSee prices for these dates
27 Dec – 3 Jan 2027$438Jeju AirIncheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)out nonstop, back nonstopfound 6 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $325.

November 2026From $3803 departure dates21 Nov – 3 Dec · found 5 days agoSee prices for these dates
December 2026From $325Cheapest seen7 departure dates8 Dec – 10 Dec · found 6 days agoSee prices for these dates
January 2027From $3735 departure dates12 Jan 2027 – 24 Jan 2027 · found 2 days agoSee prices for these dates
February 2027From $4062 departure dates27 Feb 2027 – 8 Mar 2027 · found 5 days agoSee prices for these dates
March 2027From $4251 departure date5 Mar 2027 – 14 Mar 2027 · found 2 days agoSee prices for these dates
April 2027From $4244 departure dates5 Apr 2027 – 9 Apr 2027 · found 8 days agoSee prices for these dates
June 2027From $4293 departure dates8 Jun 2027 – 10 Jun 2027 · found 7 days agoSee 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