Guide
Choosing a connecting hub: which airport to route through
12.1% of O'Hare departures landed an hour or more late, against 4.9% at Salt Lake City. Which hub to connect through depends on where you start and when.
A trip from Boston to Los Angeles with one stop can go through at least eight hubs. The fares are often within a few dollars of each other. The records are not. Over September 2025 to August 2026, Boston to Minneapolis arrived on time 82.0% of the time and Boston to O'Hare 71.9%. On the second leg, Minneapolis to Los Angeles ran 81.5% and O'Hare to Los Angeles 72.0%. Same trip, same number of flights, very different odds.
The missed-connection guide ranks the big hubs by how often a connection fails there. This guide starts from the other end: you know where you are flying from and to, and you want the hub that gives the whole trip the best chance. Three things decide it: the inbound leg, which depends on your origin; the hub's own record for departures; and the season.
What the hub itself contributes
US average 8.3%
0.0%15.0%
Departures from each hub. Lower is better. The line is the national figure. Source: US DOT Bureau of Transportation Statistics, September 2025 to August 2026.
A missed connection usually comes from one long delay, not from a short one. A 20-minute delay rarely breaks a 75-minute connection; an hour does. That makes the share of flights arriving an hour or more late the most useful single measure of a hub. Salt Lake City is the standout at 4.9%, and O'Hare and Dallas-Fort Worth the weakest at 12.1% and 10.4%. Nationally the figure is 8.3%. Given a free choice between Salt Lake City and O'Hare for a tight connection, I would take Salt Lake City without looking at anything else.
Cancellations point the same way at most hubs. Denver cancelled only 0.78% of departures and Salt Lake City 0.77%; O'Hare cancelled 2.80%, Dallas-Fort Worth 2.61% and Newark 3.44%. A cancelled onward flight at a big hub can usually be rebooked the same day. A cancelled inbound flight at your origin often cannot.
The inbound leg matters more than the hub
The connection risk data behind the site's connection risk calculator measures flights arriving at each hub, route by route. Read that way, the biggest factor in whether you make your connection is not the hub. It is the flight that takes you there, and that depends on where you start.
Of everything in the connection data, that was the finding I least expected.
From the Northeast. Every inbound leg from LaGuardia, Newark and Boston carries the Northeast's congestion and its high cancellation rates, whichever hub it goes to. Among them, the legs into Minneapolis hold up best, with Charlotte and Dulles strong from Boston, and the legs into O'Hare and Dallas-Fort Worth are the worst: LaGuardia to O'Hare ran 66.7% on time and cancelled 5.45% of its flights, while LaGuardia to Minneapolis ran 81.6%. Boston to Charlotte, at 82.0%, is one of the strongest first legs out of New England. In the calculator's terms, a one-hour connection at O'Hare from LaGuardia fails nearly twice as often as one at Minneapolis.
From the Southeast and the Ohio Valley. Atlanta is the answer, and not because of Atlanta's own record. The short Delta hops into it are among the most punctual busy routes in the country: Pittsburgh to Atlanta ran 89.2%, Raleigh-Durham to Atlanta 86.5% and Indianapolis to Atlanta 87.9%. From Columbus, Detroit does just as well: Columbus to Detroit ran 85.6%, against 75.4% for Columbus to O'Hare.
From Florida. Florida departures are weak everywhere in the afternoon, so the inbound leg is the risk. Going west, Houston, Denver and Salt Lake City have the best inbound records: Orlando to Houston Intercontinental ran 83.5% and Orlando to Denver 80.3%, against 71.1% for Orlando to O'Hare.
From the West. Eastbound trips have the easiest first leg. Flights from the West Coast into Salt Lake City and Minneapolis are some of the best inbound legs anywhere: Los Angeles to Salt Lake City ran 87.2% and Seattle to Minneapolis 87.2%. The risk moves to the second leg. Almost every hub's flights into Boston and the New York airports run behind that hub's average, and a Northeast arrival in the evening is the weakest part of the trip.
The destination can overrule the hub
Some destinations are hard to reach on time from anywhere, and then the hub choice is really a choice of second leg. San Francisco is the clearest case. Dallas-Fort Worth to San Francisco ran 60.8%, Denver to San Francisco 63.2% and O'Hare to San Francisco 66.2%, while Houston Intercontinental to San Francisco managed 78.2% and Dulles to San Francisco 77.5%. Both are United hubs, and on a United itinerary to San Francisco they are the ones to choose. Part of the weakness is recent: from April to July 2026 several routes into San Francisco ran roughly 35 to 50% on time. The drop is in the DOT files, and the data does not say why.
The hour at the hub
5am–8am5pm–8pm
55.0%95.0%
On-time percentages for departures scheduled 5am–8am and 5pm–8pm, ranked by the evening figure. Source: US DOT Bureau of Transportation Statistics, September 2025 to August 2026.
Every hub is good in its first wave. The difference is the evening. Salt Lake City's 5pm to 8pm departures ran 79.4% on time; O'Hare's 61.1%, Dallas-Fort Worth's 65.1% and Denver's 66.5%. Denver's record is a lesson in averages: its low cancellation rate makes it a good hub for a morning connection, but its evening falls further than its reputation suggests. Minneapolis and Houston Intercontinental hold their evenings better than most.
If your only option is an evening connection, the choice of hub is worth more than it is in the morning. The connection buffer guide covers how much time to add.
Summer hubs and winter hubs
On-time percentage. Darker means more delays; the best cell in each row is outlined.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ATL | 78 | 80 | 75 | 82 | 77 | 80 | 67 | 74 | 87 | 82 | 80 | 73 |
| CLT | 81 | 79 | 76 | 79 | 77 | 72 | 64 | 67 | 84 | 81 | 81 | 73 |
| DFW | 75 | 79 | 73 | 74 | 73 | 64 | 66 | 74 | 77 | 75 | 74 | 72 |
| ORD | 67 | 74 | 66 | 70 | 76 | 71 | 71 | 65 | 79 | 75 | 73 | 61 |
| DTW | 65 | 76 | 72 | 81 | 81 | 79 | 74 | 78 | 87 | 85 | 78 | 62 |
| MSP | 73 | 80 | 77 | 84 | 83 | 78 | 78 | 80 | 86 | 85 | 82 | 63 |
Each month is one month of one year: August to December 2025, January to July 2026. Source: US DOT Bureau of Transportation Statistics, September 2025 to August 2026.
The hubs split into two groups by season. Atlanta, Charlotte and Dallas-Fort Worth have their worst months in summer, when afternoon thunderstorms break their evening banks: Charlotte's July ran 63.8%. Detroit and Minneapolis had their worst month in December, and in summer they were among the better hubs in the country: Minneapolis ran 77.7% in July, against 66.5% at Atlanta. O'Hare is weak in both seasons.
Winter needs one caveat. The southern hubs kept better on-time rates in December and January, but when a rare winter storm reached them in January 2026 they cancelled far more than they delayed: January at Charlotte and January at Atlanta both carried cancellation rates well above Minneapolis's in the same month. The national picture agrees. January 2026 had the highest cancellation rate of the year, and it was concentrated at Charlotte, Dallas-Fort Worth and Washington National rather than in the snow belt. A northern hub equipped for snow can be the steadier choice in a storm week, even when its monthly on-time figure is lower.
One year holds one summer and one winter, so read the months as tendencies. But the mechanisms behind them do not change: Southeast convection every summer afternoon, snow and de-icing every northern winter. The airport guides for Atlanta and Minneapolis show both patterns month by month.
How I would route it
Northeast to the West Coast: Minneapolis or Charlotte first, Houston for San Francisco, and avoid O'Hare and Dallas-Fort Worth when an alternative costs little more.
Southeast or Ohio Valley to anywhere: Atlanta, on the morning Delta hops. Detroit is the Midwest alternative.
Florida going west: Houston, Denver or Salt Lake City, before noon.
West Coast going east: Salt Lake City or Minneapolis, and book the earliest second leg that makes sense, because the Northeast arrival is the weak link.
In summer, favour the northern hubs. Minneapolis or Detroit in July beats Atlanta or Charlotte. In December and January the southern hubs run late less often, but check the forecast: when snow reaches them, they cancel.
Whatever the hub, connect in the morning. The first wave is strong at almost every hub. The evening is where they separate.
Compare the hubs: Atlanta (ATL) · Minneapolis (MSP) · Salt Lake City (SLC) · Chicago O'Hare (ORD) · Houston (IAH) · Connection risk calculator