The latest OAG Megahubs report for 2025 reveals shifts in airport connectivity across the United States and globally, which could impact event logistics and attendee travel experiences.
Domestic Hubs
Chicago O’Hare International Airport (ORD) has reclaimed its position as the most connected airport for domestic travel in the U.S. On July 18, 2025—the busiest day for U.S. domestic air travel—ORD offered more potential connections than any other airport in the country. The airport now serves 214 domestic destinations, an increase of nine compared to the previous year.
Atlanta Hartsfield-Jackson International Airport (ATL) closely follows in second place. Home to Delta Air Lines, which consistently achieves high on-time performance in OAG’s monthly analysis, ATL remains a crucial connecting point for travelers. The airport has expanded its reach, adding eight new destinations and seeing a 14 percent increase in potential connections compared to 2024.
Dallas/Fort Worth International Airport (DFW) maintains its strong position, holding onto third place in the rankings. As American Airlines’ largest hub, DFW continues to play a top role in connecting travelers across the country.
Denver International Airport (DEN) has made progress, climbing from fifth to fourth place. This upward movement reflects Denver’s growing importance as a connecting hub for domestic flights, particularly for United Airlines, which operates 54 percent of flights at the airport.
Charlotte Douglas International Airport (CLT) rounds out the top five, dropping one position from the previous year. Despite this shift, CLT remains a key hub for American Airlines, which operates 88 percent of flights at the airport.
U.S. – International Connectivity
When it comes to international connections, U.S. airports also feature prominently in the global rankings. The OAG report highlights several U.S. airports among the world’s most internationally connected hubs:
Chicago O’Hare (ORD) ranks 7th globally for international connectivity, highlighting its significance not only as a domestic hub but also as a key gateway for international travel. United Airlines dominates at ORD, operating 49 percent of flights.
Atlanta (ATL) follows closely, ranking 8th globally. Delta Air Lines, operating 79 percent of flights, makes a significant contribution to ATL’s international connectivity.
Other U.S. airports featuring in the top 25 global rankings include:
- #13 Dallas/Fort Worth (DFW)
- #14 New York John F. Kennedy (JFK)
- #18 Houston George Bush Intercontinental (IAH)
- #20 Miami (MIA)
According to the report, JFK stands out as a unique case, ranking 14th globally for international connections, and is the only North American airport in the top 25 Low-Cost Carrier (LCC) Megahubs, where it ranks 12th. This shows JFK’s importance as both a full-service and budget-friendly international gateway.
Global Connectivity
The OAG report highlights the world’s most internationally connected airports, showcasing the global leaders in air travel connectivity:
- London Heathrow Airport (LHR) is still the world’s most connected airport for the third consecutive year. On the busiest day for global aviation in 2025, LHR offered over 59,000 possible connections to 226 destinations. British Airways dominates at LHR, operating 51 percent of flights.
- Istanbul Airport (IST) has risen from 8th position last year to 2nd place in 2025. This jump is due to a 25 percent year-on-year increase in potential connections. Turkish Airlines is the dominant carrier, operating 79 percent of flights at IST.
- Amsterdam Schiphol Airport (AMS) is now in 3rd place, up from 4th last year. KLM-Royal Dutch Airlines operates 55 percent of flights at AMS.
- Kuala Lumpur International Airport (KUL) and Frankfurt Airport (FRA) share the 4th position. KUL is the highest-ranking Asian airport in the top 10, with AirAsia operating 36 percent of flights. FRA has seen a significant rise from 10th position last year, driven by a 21 percent increase in potential connections year-on-year. Deutsche Lufthansa AG operates 56 percent of flights at FRA.
- Incheon International Airport (ICN) in South Korea rounds out the top 5. Korean Air is the dominant carrier at ICN, operating 22 percent of flights.
U.S. Airports in the Global Rankings
Several U.S. airports feature prominently in the global rankings for international connectivity:
- #7 – Chicago O’Hare (ORD)
- #8 – Atlanta (ATL)
- #13 – Dallas/Fort Worth (DFW)
- #14 – New York John F. Kennedy (JFK)
- #18 – Houston George Bush Intercontinental (IAH)
- #20 – Miami (MIA)
Cities with highly connected airports, such as Chicago, Atlanta, and Dallas/Fort Worth, present advantages for hosting large-scale events with attendees from diverse locations. Meanwhile, the strong international connections of airports like New York’s JFK and Miami International open up possibilities for events with a global audience. As you plan your next conference or corporate gathering, consider how these airport rankings might influence attendee travel convenience and overall event accessibility.
Download a copy of the 2025 OAG Megahubs report here.
