Domestic vs. Outbound International Layovers (60 to 90 Minutes)
When connecting within the same terminal or airside concourse in the US (such as Atlanta ATL, Dallas DFW, Denver DEN, or Charlotte CLT), 60–75 minutes is sufficient for domestic connections and 90 minutes is recommended before a long-haul international departure.
Arriving in the US from Abroad: Why You Need 2 to 3 Hours
At almost every US gateway (JFK, LAX, ORD, MIA, SFO, IAH, EWR, ATL), arriving international passengers—even those connecting onward—must clear US Customs & Border Protection, claim checked bags, walk through customs, re-drop bags at the transfer belt, and clear TSA security again. Budget 2 to 2.5 hours (or 90+ minutes with Global Entry / Mobile Passport Control).
European Schengen vs. Non-Schengen Transfers (FRA, AMS, CDG, LHR)
If flying from the US to Rome via Frankfurt (FRA), Amsterdam (AMS), Munich (MUC), or Paris (CDG), you enter the Schengen zone at your first European hub and pass through EU passport control before boarding your intra-European flight. Budget at least 90–120 minutes.
Frequently Asked Questions
Do I have to recheck my bags when connecting in Europe or Asia?
When connecting between two international flights on a single ticket via London LHR, Frankfurt FRA, Amsterdam AMS, Tokyo HND/NRT, Seoul ICN, or Doha DOH, checked bags normally transfer automatically to your final destination.
What happens if I arrive from Dublin (DUB), Nassau (NAS), Aruba (AUA), or Toronto (YYZ)?
Those airports feature US CBP Preclearance before takeoff, meaning your flight lands in the US as a domestic arrival with no customs wait on landing.