The 10 biggest airline hubs in the US

The 10 biggest airline hubs in the USThe 10 biggest airline hubs in the USThe cards we feature here are from partners who compensate us when you are approved through our site, and this may impact how or where these products appear. We don’t cover all available credit cards, but our analysis, reviews, and opinions are entirely from our editorial team. Terms apply to the offers listed on this page. Please view our advertising policy and product review methodology for more information.For years, Hartsfield-Jackson Atlanta International Airport (ATL) has held the title of the world's busiest airport.A big reason for its dominance: the massive Delta Air Lines operates from there.It's why frequent Delta flyers know all too well, a Delta flight often involves a connection in Atlanta.But each of the nation's "Big Three" legacy airlines have a hub-and-spoke setup that filters millions of flyers through a handful of really big airports.Flying American Airlines? You'll often find yourself in Dallas or Charlotte. If you're a regular United Airlines customer, there's a good chance you're a regular at Chicago's O'Hare International Airport (ORD).So what are the biggest airline hubs in the U.S.?Let's run down the top 10.The biggest airline hubs in the US by departuresHere's how the biggest airline hubs in the U.S. stacked up in 2025 when it came to the total number of departing flights last year, per data from aviation analytics firm Cirium.Not surprisingly, Delta's presence in Atlanta held the top spot.Reward your inbox with the TPG Daily newsletterJoin over 700,000 readers for breaking news, in-depth guides and exclusive deals from TPG’s expertsBy signing up, you will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy. You may unsubscribe at any time.RankingAirportAirline1AtlantaDelta2Dallas Fort Worth International Airport (DFW)American3Charlotte Douglas International Airport (CLT)American4Chicago-O'HareUnited5Denver International Airport (DEN)United6Houston's George Bush Intercontinental Airport (IAH)United7Chicago-O'HareAmerican8Newark Liberty International Airport (EWR)United9Miami International Airport (MIA)American10Detroit Wayne County Metropolitan Airport (DTW)DeltaSource: Cirium; airlines ranked by total 2025 departing flightsOne thing that's obvious, looking at this list, is that airports in some of the nation's busiest cities don't appear. For instance, there's no sign of New York City's John F. Kennedy International Airport (JFK) or Los Angeles International Airport (LAX), which routinely rank among the world's busiest airports.That's due, in part, to the scarcity of gate space and takeoff and landing rights created by the many domestic and international carriers that fly to those hubs; no one airline is dominant. (At some big-city airports, flight schedules are tightly regulated by the federal government.)So, for instance, even though Delta is a major player at JFK, the total flights it offers there pale in comparison to what it flies in Atlanta.O'Hare appears twiceOne airport, meanwhile, makes the list twice: O'Hare in Chicago. Hometown carrier United has long been the market leader there, but American added flights at a fast pace over the past year, fueling a turf war.Terminal 1 at Chicago's O'Hare International Airport (ORD). SEAN CUDAHY/THE POINTS GUYUS airline hubs ranked by total seatsThe list looks a little different if you look at how many total seats airlines offered at their hubs in 2025.The airlines and airports that rank higher on this list are hubs where a carrier prioritizes larger planes — rather than using a ton of regional jets.US airline hubs ranked by scheduled seatsDelta at ATLAmerican at DFWAmerican at CLTUnited at DENUnited at ORDUnited at IAHAmerican at MIAUnited at EWRAmerican at ORDUnited at SFOSource: Cirium 2025 dataUnited's SFO operation makes this top 10 list thanks to the large planes that fly in and out on transcontinental routes — including the widebody aircraft that fuel its large transpacific operation out of the Bay Area.SEAN CUDAHY/THE POINTS GUYHonorable mentions that landed just outside the top 10 were Delta's hub at Minneapolis-St. Paul International Airport (MSP), Southwest Airlines' operation at DEN and Alaska Airlines' home base at Seattle-Tacoma International Airport (SEA).Related reading:When is the best time to book flights for the cheapest airfare?The best airline credit cardsWhich US airline is best? TPG's 2026 rankingsFlight delayed or canceled? Here's what to doThe best credit cards to reach elite statusWhat are points and miles worth? TPG's monthly valuationsWas the 'fast, free' Wi-Fi really slow on your flight, too? Here's what's going onFeatured image by SEAN CUDAHY/THE POINTS GUYEditorial disclaimer: Opinions expressed here are the author’s alone, not those of any bank, credit card issuer, airline or hotel chain, and have not been reviewed, approved or otherwise endorsed by any of these entities.