Ronald Reagan Washington National Airport is 7:30 hours behind Mehrabad International Airport.

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• How far is Washington from Tehran?

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Current time

Mehrabad International Airport   12:37 AM on Tuesday, Jul 1, 2025

Ronald Reagan Washington National Airport   5:07 PM on Monday, Jun 30, 2025

Map from THR to DCA

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Meeting planner for Mehrabad International Airport and Ronald Reagan Washington National Airport

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 8:00 AM to 6:00 PM your time (THR).

To schedule a conference call or plan a meeting at the best time for both parties, you should try between 3:30 PM and 6:00 PM your time in THR. That will end up being between 8:00 AM and 10:30 AM in DCA. The chart below shows overlapping times.

Schedule a phone call from THR to DCA

If you are at THR and you want to call a friend at DCA, you can try calling them between 2:30 PM and 6:30 AM your time. This will be between 7AM - 11PM their time, since Ronald Reagan Washington National Airport is 7 hours and 30 minutes behind Mehrabad International Airport.

If you're available any time, but you want to reach someone in DCA at work, you may want to try between 4:30 PM and 12:30 AM 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.