| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jun 03 | ICN | UBN | 10:58 | 12:57 |
Landed
|
Track > |
| Jun 01 | ICN | UBN | 11:16 | 13:30 |
Landed
|
Track > |
| Sep 29 | ICN | UBN | 11:54 | 13:58 |
Landed
|
Track > |
| Sep 28 | ICN | UBN | 11:38 | 13:56 |
Landed
|
Track > |
| Sep 26 | ICN | UBN | 12:15 | 14:12 |
Delayed
|
Track > |
| Sep 24 | ICN | UBN | 14:03 | 16:04 |
Delayed
|
Track > |
| Sep 22 | ICN | UBN | 12:02 | 14:21 |
Delayed
|
Track > |
| Sep 21 | ICN | UBN | 12:03 | 14:14 |
Landed Late
|
Track > |
| Sep 19 | ICN | UBN | 12:00 | 14:06 |
Landed Late
|
Track > |
| Sep 17 | ICN | UBN | 12:07 | 14:26 |
Delayed
|
Track > |
T'way Air Flight TW421 connects Seoul, South Korea to Ulan Bator, Mongolia, taking off from Seoul Incheon International Airport ICN and landing at Chinggis Khaan Ulaanbaatar International Airport UBN.
How long is the TW421 flight from Seoul to Ulan Bator?
The average flight time from Seoul to Ulan Bator is 11 hours and 8 minutes. The flight distance is 1957 km / 1216 miles and the average flight speed is 176 km/h / 109 mph.
How many TW421 flights are operated per week?
2 flights per week. The flight TW421 is operated on Monday and Wednesday.
What is the On-Time Performance (OTP) of T'way Air Flight TW421 Seoul to Ulan Bator?
The Airportia On-Time Performance Rating for T'way Air Flight TW421 is 4.5/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest TW421 flight?
The latest flight took off on Wednesday, June 3rd, 2026 with the flight status being Landed on 12:57.
How else can the flight TW421 be referenced as?
This T'way Air flight can also be referenced as TWB421, TW0421, TW 421, TWB 421.
How often is flight TW421 delayed?
On average, 90% of all TW421 flights are delayed. The average delay is 31 minutes.
See our TW421 Flight Tracker above for more details.
Flight TW421 is code-shared by 1 airline using the flight number H15859
Other flights departing from Seoul ICN: 7C1305, KE37, KE855, KE937
Other flights arriving at Ulan Bator UBN: MR862, OM68, OM302, CA955
All flights connecting Seoul ICN to Ulan Bator UBN.
