Louisville International Airport is 1 hour ahead of St. Louis Regional Airport.

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• How far is Louisville from Alton?

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Current time

St. Louis Regional Airport   6:14 AM on Monday, Jun 9, 2025

Louisville International Airport   7:14 AM on Monday, Jun 9, 2025

Map from ALN to SDF

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Meeting planner for St. Louis Regional Airport and Louisville International Airport

To schedule a conference call or plan a meeting at the best time for both parties, you should try between 9:00 AM and 4:00 PM your time in ALN. That will end up being between 10:00 AM and 5:00 PM in SDF. The chart below shows overlapping times.

Schedule a phone call from ALN to SDF

If you are at ALN and you want to call a friend at SDF, you can try calling them between 6:00 AM and 10:00 PM your time. This will be between 7AM - 11PM their time, since Louisville International Airport is 1 hour ahead of St. Louis Regional Airport.

If you're available any time, but you want to reach someone in SDF at work, you may want to try between 8:00 AM and 4:00 PM your time. This is the best time to reach them from 9AM - 5PM during normal working hours.

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.