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Ulaanbaatar to Seoul flights in December 2026 from $150 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 $416 with Air China, 30 Dec – 20 Jan 2027, found 2 days ago. The cheapest one-way found recently is $150 with Jeju Air, 3 Dec, found 2 days ago.

Return

In December 2026, the cheapest return fare on each of 20 departure dates is usually $376 to $430. Across all 89 departure dates we hold on this route, it is usually $378 to $416. Of the 11 months with enough return fares to compare, 7 are usually cheaper than December 2026.

Cheapest return found recently

$416

30 Dec – 20 Jan 2027 · Air China

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

out 1 stop, back 1 stop

found 2 days ago

See prices for these datesCheck today's price

Cheapest we hold, of any age

$308

10 Dec – 13 Dec · Jeju Air

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

out nonstop, back nonstop

found 7 days ago

See prices for these datesCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
10 Dec – 13 Dec$308Jeju Airout nonstop, back nonstopfound 7 days agoSee prices for these dates
3 Dec – 10 Dec$337Jeju Airout nonstop, back nonstopfound 5 days agoSee prices for these dates
8 Dec – 19 Dec$357Asiana Airlinesout nonstop, back nonstopfound 7 days agoSee prices for these dates
1 Dec – 8 Dec$365Jeju Airout nonstop, back nonstopfound 4 days agoSee prices for these dates
7 Dec – 13 Dec$373Korean Airout nonstop, back nonstopfound 7 days agoSee prices for these dates

Every date we hold

20 departure dates

1 Dec – 8 Dec: $365, found 4 days ago3 Dec – 10 Dec: $337, found 5 days ago7 Dec – 13 Dec: $373, found 7 days ago8 Dec – 19 Dec: $357, found 7 days ago9 Dec – 14 Dec: $377, found 5 days ago10 Dec – 13 Dec: $308, found 7 days ago11 Dec – 18 Dec: $411, found 7 days ago12 Dec – 19 Dec: $404, found 7 days ago14 Dec – 17 Dec: $402, found 4 days ago17 Dec – 17 Dec: $406, found 6 days ago18 Dec – 21 Dec: $412, found 7 days ago19 Dec – 21 Dec: $430, found 7 days ago20 Dec – 30 Dec: $460, found 3 days ago21 Dec – 29 Dec: $444, found 7 days ago24 Dec – 5 Jan 2027: $417, found 5 days ago26 Dec – 9 Jan 2027: $492, found 2 days ago28 Dec – 17 Jan 2027: $436, found 2 days ago29 Dec – 17 Jan 2027: $430, found 2 days ago30 Dec – 20 Jan 2027: $416, found 2 days ago31 Dec – 5 Jan 2027: $411, found 4 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec – 8 Dec$365Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates
3 Dec – 10 Dec$337Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
7 Dec – 13 Dec$373Korean AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
8 Dec – 19 Dec$357Asiana AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
9 Dec – 14 Dec$377Korean AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
10 Dec – 13 Dec$308Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
11 Dec – 18 Dec$411MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
12 Dec – 19 Dec$404Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
14 Dec – 17 Dec$402Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates
17 Dec – 17 Dec$406Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 6 days agoSee prices for these dates
18 Dec – 21 Dec$412Air ChinaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 7 days agoSee prices for these dates
19 Dec – 21 Dec$430MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
20 Dec – 30 Dec$460Asiana AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 3 days agoSee prices for these dates
21 Dec – 29 Dec$444MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 7 days agoSee prices for these dates
24 Dec – 5 Jan 2027$417Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 5 days agoSee prices for these dates
26 Dec – 9 Jan 2027$492Aero MongoliaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
28 Dec – 17 Jan 2027$436Air ChinaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out 1 stop, back nonstopfound 2 days agoSee prices for these dates
29 Dec – 17 Jan 2027$430Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 2 days agoSee prices for these dates
30 Dec – 20 Jan 2027$416Air ChinaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
31 Dec – 5 Jan 2027$411MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)out nonstop, back nonstopfound 4 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $308.

November 2026From $33115 departure dates29 Nov – 8 Dec · found 2 days agoSee prices for these datesEvery date in November 2026
December 2026From $308Cheapest seen20 departure dates10 Dec – 13 Dec · found 7 days agoSee prices for these dates
January 2027From $34214 departure dates24 Jan 2027 – 22 Feb 2027 · found 8 days agoSee prices for these datesEvery date in January 2027
February 2027From $3889 departure dates8 Feb 2027 – 15 Feb 2027 · found 5 days agoSee prices for these datesEvery date in February 2027
March 2027From $3778 departure dates21 Mar 2027 – 1 Apr 2027 · found 6 days agoSee prices for these datesEvery date in March 2027
April 2027From $3435 departure dates1 Apr 2027 – 10 Apr 2027 · found 6 days agoSee prices for these dates
May 2027From $3613 departure dates18 May 2027 – 4 Jun 2027 · found 6 days agoSee prices for these dates
June 2027From $3984 departure dates6 Jun 2027 – 14 Jun 2027 · found 4 days agoSee prices for these dates
July 2027From $4213 departure dates24 Jul 2027 – 6 Aug 2027 · found 3 days agoSee prices for these dates
August 2027From $4124 departure dates17 Aug 2027 – 26 Aug 2027 · found 7 days agoSee prices for these dates
September 2027From $4121 departure date1 Sept 2027 – 12 Sept 2027 · found 2 days agoSee prices for these dates
October 2027From $3983 departure dates16 Oct 2027 – 25 Oct 2027 · found 7 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 7 departure dates is usually $156 to $203. Across all 45 departure dates we hold on this route, it is usually $181 to $231. Of the 7 months with enough one-way fares to compare, December 2026 is usually the cheapest.

Cheapest one-way found recently

$150

3 Dec · Jeju Air

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

nonstop

found 2 days ago

Open this tripCheck today's price

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

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
3 Dec$150Jeju Airnonstopfound 2 days agoOpen this trip
8 Dec$150Jeju Airnonstopfound 2 days agoOpen this trip
10 Dec$162Jeju Airnonstopfound 2 days agoOpen this trip
6 Dec$177Jeju Airnonstopfound 4 days agoOpen this trip
31 Dec$183Jeju Airnonstopfound 7 days agoOpen this trip

Every date we hold

7 departure dates

3 Dec: $150, found 2 days ago6 Dec: $177, found 4 days ago7 Dec: $222, found 5 days ago8 Dec: $150, found 2 days ago10 Dec: $162, found 2 days ago14 Dec: $240, found 4 days ago31 Dec: $183, found 7 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
3 Dec$150Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
6 Dec$177Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 4 days agoOpen this trip
7 Dec$222Korean AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 5 days agoOpen this trip
8 Dec$150Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
10 Dec$162Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 2 days agoOpen this trip
14 Dec$240Air ChinaChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)1 stopfound 4 days agoOpen this trip
31 Dec$183Jeju AirChinggis Khaan International Airport (UBN) → Incheon International Airport (ICN)nonstopfound 7 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $150.

November 2026From $1676 departure dates17 Nov · found 3 days agoOpen this tripEvery date in November 2026
December 2026From $150Cheapest seen7 departure dates3 Dec · found 2 days agoOpen this trip
January 2027From $1558 departure dates19 Jan 2027 · found 6 days agoOpen this tripEvery date in January 2027
February 2027From $1818 departure dates7 Feb 2027 · found 4 days agoOpen this tripEvery date in February 2027
April 2027From $1924 departure dates29 Apr 2027 · found 5 days agoOpen this trip
May 2027From $2074 departure dates2 May 2027 · found 7 days agoOpen this trip
June 2027From $2312 departure dates18 Jun 2027 · found 6 days agoOpen this trip
August 2027From $2483 departure dates6 Aug 2027 · found 4 days agoOpen this trip
September 2027From $2311 departure date16 Sept 2027 · found 7 days agoOpen this trip
October 2027From $2312 departure dates26 Oct 2027 · found 6 days agoOpen this trip

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