St Augustine is 13 hours behind Cheongju International Airport.
Current time
Cheongju International Airport 1:02 AM on Monday, Jun 30, 2025
St Augustine 12:02 PM on Sunday, Jun 29, 2025
Map from CJJ to UST
More trip calculations
Meeting planner for Cheongju International Airport and St Augustine
Unfortunately, there aren't any times that overlap between your normal working hours and theirs. The best we can do with the meeting planner is to expand the range to cover from 7:00 AM to 7:00 PM your time (CJJ).
To schedule a conference call or plan a meeting at the best time for both parties, you should try between 7:00 AM and 8:00 AM your time in CJJ. That will end up being between 6:00 PM and 7:00 PM in UST. The chart below shows overlapping times.
Schedule a phone call from CJJ to UST
If you are at CJJ and you want to call a friend at UST, you can try calling them between 8:00 PM and 12:00 PM your time. This will be between 7AM - 11PM their time, since St Augustine is 13 hours behind Cheongju International Airport.
If you're available any time, but you want to reach someone in UST at work, you may want to try between 10:00 PM and 6:00 AM your time. This is the best time to reach them from 9AM - 5PM during normal working hours.
| UTC+9 hours | UTC-4 hours |
| CJJ | UST |
| 7:00 AM | 6:00 PM |
| 7:30 AM | 6:30 PM |
| 8:00 AM | 7:00 PM |
Cheongju International Airport
IATA: CJJICAO: RKTU
City: Cheongju
Country: South Korea
Category: airports
Time zone: Asia/Seoul (UTC/GMT +9 hours)
related links
St Augustine
IATA: USTCity: Saint Augustine
State: Florida
Country: United States
Category: airports
Time zone: US/Eastern (UTC/GMT -4 hours)
related links
Time difference
Travelmath provides an online time zone converter for places all over the world. You can enter airports, cities, states, countries, or zip codes to find the time difference between any two locations. The calculator will automatically adjust for daylight saving time (DST) in the summer. You can use it as a meeting planner or a scheduler to find the best time to make international phone calls. World time zones have a positive or negative offset computed from Coordinated Universal Time (UTC), or Greenwich Mean Time (GMT). UTC has uniform seconds defined by International Atomic Time (TAI), with leap seconds announced at irregular intervals to compensate for the Earth's slowing rotation. The tz database or zoneinfo database uses the closest city, rather than the more common Eastern, Central, Mountain or Pacific time zones in the United States. Countries often change their daylight saving rules, so please help us stay current by letting us know if you find any pages that need updates.
