| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jul 06 | CJJ | UBN | 21:45 | 23:57 |
Landed
|
Track > |
| Jul 05 | CJJ | UBN | 21:33 | 23:47 |
Landed
|
Track > |
| Jul 03 | CJJ | UBN | 21:48 | 23:57 |
Landed
|
Track > |
| Jul 01 | CJJ | UBN | 22:02 | 00:16 |
Landed
|
Track > |
| Jun 29 | CJJ | UBN | 21:46 | 23:59 |
En-Route
|
Track > |
| Jun 28 | CJJ | UBN | 21:45 | 23:57 |
Landed
|
Track > |
| Jun 26 | CJJ | UBN | 21:48 | 23:52 |
Landed
|
Track > |
| Jun 24 | CJJ | UBN | 22:06 | 00:28 |
Delayed
|
Track > |
| May 10 | CJJ | UBN | 21:47 | 00:08 |
En-Route
|
Track > |
| May 06 | CJJ | UBN | 21:35 | 00:05 |
En-Route
|
Track > |
Aero K Airlines Flight RF421 connects Cheongju, South Korea to Ulan Bator, Mongolia, taking off from Cheongju International Airport CJJ and landing at Chinggis Khaan Ulaanbaatar International Airport UBN.
How long is the RF421 flight from Cheongju to Ulan Bator?
The average flight time from Cheongju to Ulan Bator is 11 hours and 13 minutes. The flight distance is 2082 km / 1294 miles and the average flight speed is 185 km/h / 115 mph.
How many RF421 flights are operated per week?
4 flights per week. The flight RF421 is operated on Monday, Wednesday, Friday and Sunday.
What is the On-Time Performance (OTP) of Aero K Airlines Flight RF421 Cheongju to Ulan Bator?
The Airportia On-Time Performance Rating for Aero K Airlines Flight RF421 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest RF421 flight?
The latest flight took off on Tuesday, July 7th, 2026 with the flight status being Landed on 23:57.
How else can the flight RF421 be referenced as?
This Aero K Airlines flight can also be referenced as EOK421, RF0421, RF 421, EOK 421.
How often is flight RF421 delayed?
On average, 30% of all RF421 flights are delayed. The average delay is 12 minutes.
See our RF421 Flight Tracker above for more details.
Other flights departing from Cheongju CJJ: ZE715, OZ8239, ZE781, RF332
Other flights arriving at Ulan Bator UBN: OM2972, OM510, LJ781, MR802
All flights connecting Cheongju CJJ to Ulan Bator UBN.
