Which US Airports Are Best for Connecting Flights?

Portland (PDX) and Salt Lake City (SLC) are the most reliable major hubs for a connecting flight, both departing on time about 84% of the time, with Washington Dulles (IAD) close behind at 83%. Honolulu (HNL) posts the nation's highest on-time rate (86%), but it's mostly an island origin/destination airport, not a real connecting hub.

• Portland (PDX) and Salt Lake City (SLC) are the most reliable real-world connecting hubs, both departing on time 84.3% of the time; Washington Dulles (IAD) is close behind at 83.2%.
• Honolulu (HNL) has the best on-time rate of any major US airport, 86.3%, but almost all its traffic starts or ends in Hawaii, so it's a poor stand-in for "best connecting airport."
• Dallas/Fort Worth (DFW) is the least reliable major airport for a connection, on time only 72.3% of the time with a 21.0-minute average arrival delay.
• PDX and SLC also cancel the fewest flights among major airports, just 0.7% each, versus 2.5% at DFW — the worst cancellation rate of the group.
• A reliable hub lowers your odds of a rough layover, but it doesn't guarantee one — your specific inbound flight's own on-time history still matters.

What makes an airport good for connecting flights?

A good connecting airport is one where your inbound flight is statistically likely to land on time and your outbound flight is statistically likely to leave on time, so the layover you booked actually holds up in practice. FlightRecord measures this across 37 major US airports — each handling at least 50,000 departures a year — using each airport's on-time departure rate, average arrival delay, and cancellation rate, per the US DOT, drawn from 14.1 million US flights tracked from June 2024 through May 2026. The on-time departure rate matters most for a layover, because a late departure is what turns a comfortable connection into a sprint through the terminal.

The best major airports for connecting flights

Among airports that see real connecting traffic — meaning multiple airlines route meaningful volumes of passengers through them, not just to and from the local metro — three stand out.

• Portland (PDX): 84.3% on time, an 11.0-minute average arrival delay, 0.7% cancelled.
• Salt Lake City (SLC): 84.3% on time, an 11.6-minute average arrival delay, 0.7% cancelled — Delta's western regional hub, so it carries genuine connecting volume despite a mid-size metro.
• Washington Dulles (IAD): 83.2% on time, a 14.9-minute average arrival delay, 1.2% cancelled — United's primary East Coast international gateway.

Honolulu (HNL) technically posts the best on-time rate of any major US airport, 86.3%, with just a 9.0-minute average delay and 0.8% cancellations, driven by long-haul schedules built with extra slack and consistently mild weather. But HNL is a poor model for "best connecting airport": most passengers start or end their trip on Oahu rather than connecting onward, so its excellent numbers describe an origin/destination airport, not a hub built around tight banks of connections. Sacramento (SMF), at 82.0% on time, falls in the same category — a strong on-time record built on point-to-point traffic rather than multi-airline connections.

Airports where a tight connection is riskier

At the other end, five major airports depart on time less than 75% of the time, and a short layover there is a meaningfully bigger gamble. Dallas/Fort Worth (DFW) is the least reliable major airport in the country for a connection — 72.3% on time, a 21.0-minute average arrival delay, and 2.5% of flights cancelled outright, the highest cancellation rate among major airports.

• Dallas Love Field (DAL): 72.9% on time, a 16.2-minute average delay, 1.3% cancelled.
• Fort Lauderdale (FLL): 73.2% on time, a 20.0-minute average delay, 1.9% cancelled.
• Baltimore/Washington (BWI): 73.3% on time, a 17.0-minute average delay, 1.5% cancelled.
• Miami (MIA): 74.3% on time, a 20.2-minute average delay, 1.7% cancelled.

Booking a tight 45-minute connection at any of these five airports is a meaningfully worse bet than the same layover at PDX or SLC — the on-time gap between the best and worst major airports is more than 12 percentage points.

Reliability and hub size don't move together, either. DFW and MIA are genuine mega-hubs — American's largest hub and a primary Latin America gateway, respectively — so a low on-time rate there affects far more connecting passengers than the same rate would at a smaller airport. PDX and SLC handle a fraction of that volume, but the flights they do run tend to land and depart close to schedule, which is exactly the trait that matters when you're timing a connection rather than just booking the cheapest fare.

Why the hub you connect through matters so much

Connecting hubs schedule tight banks of flights that all depend on the same aircraft, crews, and gates arriving on schedule, so a single late-arriving aircraft can cascade through an entire afternoon. Nationally, late-arriving aircraft cause roughly 39% of all US flight delay-minutes — more than weather or air traffic control — which is exactly why the airport you connect through matters as much as the layover length you book. See how much layover time you need for a connecting flight for the specific buffer math by connection type.

How to choose a safer connection

If your itinerary lets you choose, routing through PDX, SLC, or IAD instead of DFW, FLL, or BWI is worth a small fare difference — that 12-point on-time gap is the difference between a routine layover and regularly sprinting to a gate. The complete ranking of all 37 major airports, built from the same DOT data, is on FlightRecord's most reliable airports ranking. Whichever hub you connect through, pair the airport's track record with your specific inbound flight's own on-time history — an airport's average doesn't guarantee any single flight's outcome.

See our head-to-head comparison of O'Hare vs. Midway on-time performance for more on how Chicago’s two airports stack up.

Frequently asked questions

Which US airport is best for connecting flights?

Among airports that see real connecting traffic, Portland (PDX) and Salt Lake City (SLC) are the most reliable, both departing on time 84.3% of the time, with Washington Dulles (IAD) close behind at 83.2%. All three cancel well under 2% of departures, which matters for a layover since a cancellation is worse than a delay.

Is Honolulu a good airport to connect through?

Not really, despite having the best on-time rate of any major US airport at 86.3%. Almost all HNL traffic starts or ends in Hawaii rather than connecting onward, so its strong numbers describe an origin/destination airport rather than a hub built for tight connecting banks. Treat its on-time rate as a fact about Honolulu, not a recommendation to route a connection through it.

What's the worst major airport for a tight connection?

Dallas/Fort Worth (DFW), on time only 72.3% of the time with a 21.0-minute average arrival delay and a 2.5% cancellation rate — the highest of any major US airport. Dallas Love Field, Fort Lauderdale, Baltimore/Washington, and Miami are close behind, all under 75% on time.

How much extra buffer should I add at a less reliable hub?

At least 30 to 45 minutes more than you would at a reliable hub like PDX or SLC. See how much layover time you need for a connecting flight for the full breakdown by connection type.

Do smaller or less-known airports have better on-time rates than big hubs?

Sometimes, but check what kind of airport it is. Sacramento (SMF) posts a strong 82.0% on-time rate, but like Honolulu, it handles mostly point-to-point traffic rather than the tight connecting banks that drive delays at true hubs, so its numbers aren't directly comparable to a connecting airport like IAD.

Does airport size affect how risky a connection is?

Not directly. Some of the busiest hubs, like DFW and MIA, have below-average on-time rates, while some of the most reliable hubs, like PDX and SLC, handle a fraction of the traffic. What matters for a layover is the on-time rate itself, not how many flights the airport handles overall.