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Ulaanbaatar to Bangkok flights in December 2026 from $683 UBN → BKK, DMK

Chinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK), Don Mueang International Airport (DMK)

For departures in December 2026, the cheapest return found recently is $683 with Aero Mongolia, 19 Dec – 13 Jan 2027, found 2 days ago.

Return

In December 2026, the cheapest return fare on each of 19 departure dates is usually $659 to $816. Across all 46 departure dates we hold on this route, it is usually $615 to $768. Of the 5 months with enough return fares to compare, December 2026 is usually the most expensive.

Cheapest return found recently

$683

19 Dec – 13 Jan 2027 · Aero Mongolia

Chinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)

out 2 stops, back 1 stop

found 2 days ago

See prices for these datesCheck today's price

Cheapest we hold, of any age

$525

27 Dec – 14 Jan 2027 · MIAT Mongolian Airlines

Chinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)

out 2 stops, back 2 stops

found 3 days ago

See prices for these datesCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
27 Dec – 14 Jan 2027$525MIAT Mongolian Airlinesout 2 stops, back 2 stopsfound 3 days agoSee prices for these dates
2 Dec – 7 Dec$549Air Chinaout 1 stop, back 1 stopfound 6 days agoSee prices for these dates
7 Dec – 28 Dec$549Air Chinaout 1 stop, back 1 stopfound 8 days agoSee prices for these dates
3 Dec – 15 Dec$565MIAT Mongolian Airlinesout 1 stop, back 1 stopfound 4 days agoSee prices for these dates
15 Dec – 15 Jan 2027$634Air Chinaout 1 stop, back 2 stopsfound 3 days agoSee prices for these dates

Every date we hold

19 departure dates

2 Dec – 7 Dec: $549, found 6 days ago3 Dec – 15 Dec: $565, found 4 days ago7 Dec – 28 Dec: $549, found 8 days ago11 Dec – 11 Jan 2027: $698, found 2 days ago15 Dec – 15 Jan 2027: $634, found 3 days ago17 Dec – 16 Jan 2027: $761, found 3 days ago18 Dec – 22 Dec: $702, found 4 days ago19 Dec – 13 Jan 2027: $683, found 2 days ago20 Dec – 15 Jan 2027: $791, found 5 days ago21 Dec – 16 Jan 2027: $815, found 5 days ago22 Dec – 14 Jan 2027: $685, found 5 days ago23 Dec – 10 Jan 2027: $688, found 3 days ago24 Dec – 16 Jan 2027: $826, found 3 days ago25 Dec – 17 Jan 2027: $919, found 3 days ago26 Dec – 15 Jan 2027: $817, found 5 days ago27 Dec – 14 Jan 2027: $525, found 3 days ago28 Dec – 18 Jan 2027: $918, found 3 days ago30 Dec – 18 Jan 2027: $823, found 5 days ago31 Dec – 11 Jan 2027: $760, found 2 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
2 Dec – 7 Dec$549Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
3 Dec – 15 Dec$565MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
7 Dec – 28 Dec$549Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 8 days agoSee prices for these dates
11 Dec – 11 Jan 2027$698Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 2 days agoSee prices for these dates
15 Dec – 15 Jan 2027$634Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 2 stopsfound 3 days agoSee prices for these dates
17 Dec – 16 Jan 2027$761Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 3 days agoSee prices for these dates
18 Dec – 22 Dec$702Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
19 Dec – 13 Jan 2027$683Aero MongoliaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 2 days agoSee prices for these dates
20 Dec – 15 Jan 2027$791Asiana AirlinesChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
21 Dec – 16 Jan 2027$815Air ChinaChinggis Khaan International Airport (UBN) → Don Mueang International Airport (DMK)out 2 stops, back 1 stopfound 5 days agoSee prices for these dates
22 Dec – 14 Jan 2027$685Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
23 Dec – 10 Jan 2027$688Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 2 stops, back 2 stopsfound 3 days agoSee prices for these dates
24 Dec – 16 Jan 2027$826MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 2 stops, back 1 stopfound 3 days agoSee prices for these dates
25 Dec – 17 Jan 2027$919Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 3 days agoSee prices for these dates
26 Dec – 15 Jan 2027$817Spring AirlinesChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
27 Dec – 14 Jan 2027$525MIAT Mongolian AirlinesChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 2 stops, back 2 stopsfound 3 days agoSee prices for these dates
28 Dec – 18 Jan 2027$918Air ChinaChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 2 stops, back 2 stopsfound 3 days agoSee prices for these dates
30 Dec – 18 Jan 2027$823Air ChinaChinggis Khaan International Airport (UBN) → Don Mueang International Airport (DMK)out 2 stops, back 1 stopfound 5 days agoSee prices for these dates
31 Dec – 11 Jan 2027$760Korean AirChinggis Khaan International Airport (UBN) → Suvarnabhumi Airport (BKK)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $525.

November 2026From $5473 departure dates22 Nov – 22 Dec · found 4 days agoSee prices for these dates
December 2026From $525Cheapest seen19 departure dates27 Dec – 14 Jan 2027 · found 3 days agoSee prices for these dates
January 2027From $58014 departure dates8 Jan 2027 – 22 Jan 2027 · found 7 days agoSee prices for these datesEvery date in January 2027
February 2027From $6213 departure dates1 Feb 2027 – 8 Feb 2027 · found 7 days agoSee prices for these dates
March 2027From $5934 departure dates13 Mar 2027 – 25 Mar 2027 · found 3 days agoSee prices for these dates
April 2027From $6731 departure date1 Apr 2027 – 12 Apr 2027 · found 5 days agoSee prices for these dates
July 2027From $7771 departure date30 Jul 2027 – 8 Aug 2027 · found 6 days agoSee prices for these dates
October 2027From $6191 departure date19 Oct 2027 – 1 Nov 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