| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Sep 14 | CJJ | UBN | 21:39 | 00:14 |
En-Route
|
Track > |
| Sep 11 | CJJ | UBN | 21:45 | 00:06 |
Landed
|
Track > |
| Sep 07 | CJJ | UBN | 21:37 | 23:56 |
Landed
|
Track > |
| Sep 04 | CJJ | UBN | 21:46 | 23:57 |
Landed
|
Track > |
| Aug 31 | CJJ | UBN | 21:39 | 23:58 |
Landed
|
Track > |
| Aug 28 | CJJ | UBN | 21:42 | 23:58 |
Landed
|
Track > |
| Aug 26 | CJJ | UBN | 22:06 | 00:32 |
Delayed
|
Track > |
| Aug 24 | CJJ | UBN | 21:54 | 00:19 |
En-Route
|
Track > |
| Aug 23 | CJJ | UBN | 21:51 | 00:03 |
Landed
|
Track > |
| Aug 21 | CJJ | UBN | 21:50 | 00:03 |
Landed
|
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 19 minutes. The flight distance is 2082 km / 1294 miles and the average flight speed is 184 km/h / 114 mph.
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, September 15th, 2026 with the flight status being En-Route on 00:14.
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, 40% 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: QW938, TW25, 3U3704
Other flights arriving at Ulan Bator UBN: OM2972, OM62, LJ781, XF202
All flights connecting Cheongju CJJ to Ulan Bator UBN.
