Seoul to Ulaanbaatar GMP, ICN → UBN
Gimpo International Airport (GMP), Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)
The cheapest return found recently is $310 with Jeju Air, 8 Dec – 15 Dec, found today. The cheapest one-way found recently is $239 with MIAT Mongolian Airlines, 1 Sept 2027, found 4 days ago.
Return
The cheapest return fare on each of 27 departure dates is usually $386 to $450.
Cheapest return found recently
$310
8 Dec – 15 Dec · Jeju Air
Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)
Leaves 11:30 a.m. · Return leaves 3:15 p.m. · 6 h 55 min of travel, both ways together
out nonstop, back nonstop
found today
Cheapest nonstop return
$310
8 Dec – 15 Dec · Jeju Air
Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)
Leaves 11:30 a.m. · Return leaves 3:15 p.m. · 6 h 55 min of travel, both ways together
out nonstop, back nonstop
found today
Found recently, and the cheapest we hold
$310 8 Dec – 15 Decfound todaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $270 to $351.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 27 departure dates from 23 Oct to 5 Jul 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
No. We hold 7-night return fares on 1 other departure date within 3 days of 8 Dec, and it is not cheaper.
Every date we hold
90 fares on 27 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 23 Oct – 29 Oct | $547 | Korean Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 25 Oct – 24 Nov | $387 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 30 Oct – 8 Nov | $444 | Korean Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 3 Nov – 1 Dec | $387 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 15 Nov – 15 Dec | $362 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 2 days ago | See prices for these dates |
| 17 Nov – 29 Nov | $381 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 19 Nov – 1 Dec | $351 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 4 days ago | See prices for these dates |
| 24 Nov – 6 Dec | $384 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found today | See prices for these dates |
| 26 Nov – 31 Dec | $346 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 2 days ago | See prices for these dates |
| 1 Dec – 31 Dec | $364 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 4 Dec – 4 Dec | $450 | Korean Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 5 Dec – 5 Dec | $442 | Korean Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found today | See prices for these dates |
| 6 Dec – 13 Dec | $401 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found today | See prices for these dates |
| 8 Dec – 15 Dec | $310 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found today | See prices for these dates |
| 15 Dec – 22 Dec | $538 | Air China | Gimpo International Airport (GMP) → Chinggis Khaan International Airport (UBN) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
| 17 Dec – 18 Dec | $453 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back 1 stop | found today | See prices for these dates |
| 18 Dec – 19 Dec | $490 | MIAT Mongolian Airlines | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 19 Dec – 9 Jan 2027 | $422 | Aero Mongolia | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found yesterday | See prices for these dates |
| 20 Dec – 11 Jan 2027 | $421 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 21 Dec – 9 Jan 2027 | $429 | Aero Mongolia | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 25 Dec – 4 Jan 2027 | $492 | Korean Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 26 Dec – 31 Dec | $413 | Aero Mongolia | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 28 Dec – 13 Jan 2027 | $429 | Aero Mongolia | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 29 Dec – 9 Jan 2027 | $425 | Jeju Air | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 2 days ago | See prices for these dates |
| 7 Feb 2027 – 23 Feb 2027 | $450 | MIAT Mongolian Airlines | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 2 days ago | See prices for these dates |
| 8 Mar 2027 – 22 Mar 2027 | $438 | MIAT Mongolian Airlines | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found 3 days ago | See prices for these dates |
| 5 Jul 2027 – 19 Jul 2027 | $461 | Aero Mongolia | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | out nonstop, back nonstop | found today | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $310.
Airlines on the cheapest dates: Jeju Air, Korean Air, Aero Mongolia, MIAT Mongolian Airlines, Air China.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$239
1 Sept 2027 · MIAT Mongolian Airlines
Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)
Leaves 2:20 p.m. · 3 h 40 min trip
nonstop
found 4 days ago
Cheapest nonstop one-way
$239
1 Sept 2027 · MIAT Mongolian Airlines
Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN)
Leaves 2:20 p.m. · 3 h 40 min trip
nonstop
found 4 days ago
Found recently, and the cheapest we hold
$239 1 Sept 2027found 4 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 21 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $198 to $359.
21 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Not enough comparable prices yet: we hold one-way fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 1 Sept 2027 to compare.
Every date we hold
2 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 1 Sept 2027 | $239 | MIAT Mongolian Airlines | Incheon International Airport (ICN) → Chinggis Khaan International Airport (UBN) | nonstop | found 4 days ago | Open this trip |
Airlines on the cheapest dates: MIAT Mongolian Airlines.
Premium cabin fares from Seoul to Ulaanbaatar
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 8 Dec – 15 Dec in another cabin: Premium economy · Business · First
Today's prices for 1 Sept 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Seoul to Ulaanbaatar?
Return
Fares 30 to 59 days before departure were typically 30% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $446 | $373 | +43% | 18 |
| 7–13 days | $387 | $358 | +24% | 19 |
| 14–29 days | $332 | $295 | +7% | 25 |
| 30–59 days | $311 | $270 | Cheapest seen | 25 |
| 60–89 days | $388 | $348 | +25% | 23 |
| 90–179 days | $417 | $360 | +34% | 25 |
| 180+ days | $424 | $384 | +36% | 22 |
One-way
Not enough history yet: in 21 days of one-way prices, 24 Sept to 18 Oct, fewer than 3 booking ranges had prices on 7 days or more.
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
One-way
Cheongju → Ulaanbaatar
112 km from Seoul
$259
$20 more than flying from Seoul
15 Nov · CJJ → UBN · 1 stop
found 5 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 8 Dec – 15 Dec. A live search on this page shows what those dates cost now, for one adult in economy.
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