A look at what the Department of Transportation’s on-time performance numbers say about when, where, and with whom you’re most likely to arrive on time.
If you’ve ever been told to “book the first flight of the day,” you’ve heard a real piece of advice backed by real data — just one that’s usually delivered without the underlying numbers. The U.S. Department of Transportation publishes a monthly Air Travel Consumer Report with detailed on-time statistics by airline, by airport, and by time of day. The patterns in that data are consistent enough that a few simple booking habits can meaningfully change your odds of arriving on time.
Here’s what the numbers actually say, based on the most recent DOT reporting.
What “on time” officially means
The DOT counts a flight as on time if it arrives at the gate within 15 minutes of its scheduled time. That’s a generous definition — a flight that lands 14 minutes late still counts as “on time” — but it’s the standard used across every airline and airport in the report, so the comparisons are apples to apples.
In October 2025, the most recent full month reported, the industry average was 79.5 percent on-time arrivals across all U.S. airlines. Year-to-date through October 2025, it was 76.8 percent. In other words, about one in four flights nationally misses that 15-minute window over the course of a year.
The airline ranking, by the numbers
The DOT’s October 2025 report ranks the major U.S. carriers by on-time performance. The top and bottom look like this, year-to-date through October 2025:
The most reliable:
- Hawaiian Airlines: 83.2% on-time
- Delta Air Lines Network: 80.0%
- Spirit Airlines: 78.2%
- Southwest Airlines: 78.0%
- Alaska Airlines Network: 77.6%
The least reliable:
- JetBlue Airways: 73.4%
- American Airlines Network: 73.6%
- Frontier Airlines: 70.7%
- Allegiant Air: 75.0%
Worth noting: the network-level numbers for American, Delta, United, and Alaska include flights operated by their branded codeshare partners (regional carriers like SkyWest, Envoy, and Republic), which is how most travelers actually experience those airlines. The operating-carrier rankings tell a slightly different story — among operating carriers in October 2025, SkyWest (82.4%) and Envoy (81.0%) both outperformed most major airlines.
The practical takeaway isn’t that you should boycott any particular airline. The gap between the best and worst performers is roughly ten percentage points over the year. But if you have a truly time-sensitive trip and multiple airline options at similar prices, the difference between an 83 percent on-time airline and a 71 percent one is real.
Time of day matters more than airline choice
This is the clearest pattern in the data, and it’s why the “first flight of the day” advice persists. On-time performance declines steadily through the day as delays propagate forward — a plane that leaves Los Angeles late at 10 a.m. arrives in Chicago late at 4 p.m. and then leaves for New York late at 5 p.m. The problem compounds.
Analysis of DOT data by the flight-tracking firm Cirium (via Thrifty Traveler) found that during summer 2024’s worst-performing months, the earliest morning flights were about 30 percent more likely to depart on time compared with afternoon or evening flights. The worst five-hour stretch for on-time performance was 7 p.m. to midnight.
Why morning flights do better:
- The aircraft that operates the first flight of the day almost always arrived at the airport the night before, so there’s no upstream delay to inherit.
- Crews are starting fresh and aren’t close to their federally mandated maximum duty hours.
- Summer afternoon thunderstorms typically develop between 2 and 4 p.m. in much of the U.S. — a 6:30 a.m. flight beats them.
The trade-off is real: an early-morning flight means an early-morning alarm. But if the stakes are a wedding, a cruise departure, or a non-refundable reservation, the data favors the first flight of the day by a wide margin.
Worst months to fly
Summer and December consistently produce the highest delay rates. From the DOT’s October 2025 report, here are the 2025 year-to-date monthly numbers for the industry:
- January 2025: 78.4% on-time
- February: 77.8%
- March: 79.4%
- April: 79.6%
- May: 75.3%
- June: 70.1%
- July: 69.2%
- August: 76.8%
- September: 83.1%
- October: 79.5%
June and July were the worst months of the year so far, with fewer than 7 in 10 flights arriving on time. September was the best month. The pattern repeats most years: summer peak travel overloads the system, weather disruptions are most frequent, and schedules are tightest. Late September through early November, and the first two weeks of December before holiday rush, tend to be the sweet spots.
If your travel dates are flexible and you’re trying to minimize delay risk, shifting a late-June trip to early September does more for your odds than any airline or airport choice.
Worst airports, by the numbers
Some hubs consistently run below the national average. In October 2025, among the 30 largest U.S. airports, these ran notably below the 79.5% industry on-time rate:
- Boston Logan (BOS): 63.5%
- Newark Liberty (EWR): 70.9%
- Reagan National (DCA): 74.4%
- Nashville (BNA): 75.5%
- Las Vegas (LAS): 77.4%
Meanwhile, these were above average:
- Atlanta (ATL): 85.8%
- Charlotte (CLT): 86.0%
- Detroit (DTW): 86.4%
- Washington Dulles (IAD): 85.6%
- Houston Intercontinental (IAH): 82.9%
Newark and Boston have been below-average for years, driven by a combination of congested Northeast airspace, weather, and runway constraints. If you can substitute JFK or LaGuardia for Newark — or Providence or Manchester for Boston — the data suggests it’s usually a better bet for arrival reliability, though the DOT cautions that conditions vary significantly by route and season.
Practical booking strategy, based on the data
Four things the numbers actually support:
- First flight of the day beats afternoon or evening flights. This is the single biggest controllable factor. The 6-10 a.m. window has the best on-time rates; 7 p.m. to midnight has the worst.
- September beats July. If you can shift a summer trip by a few weeks, you’ll face dramatically fewer delays. January through April also performs well, outside of major winter storms.
- Nonstop beats connecting. A delayed nonstop still arrives the same day. A delayed first leg on a connecting itinerary can turn into an overnight stay. The DOT data on individual flight delays doesn’t capture missed connections, but the math is obvious: each flight has about a 20-25 percent chance of being late, so a two-flight itinerary roughly doubles the chance of a disruption somewhere.
- Check your airport, not just your airline. Newark’s 71 percent on-time rate in October 2025 applies to every airline operating there. If you have a choice of hubs for a connection, the underlying airport often matters more than which airline you pick.
Where to check the current numbers yourself
The DOT publishes a new Air Travel Consumer Report about the middle of every month, covering data from two months prior (so mid-April’s report covers February data). You can download the PDFs directly at transportation.gov/airconsumer. The Bureau of Transportation Statistics also runs a flight-specific lookup at transtats.bts.gov that lets you search historical on-time performance for any specific route and flight number — useful if you’re deciding between two similar flights.
None of this makes delays avoidable. Weather, air traffic control, and mechanical issues account for the majority of disruptions, and none of them respect your travel plans. What the data does show is that a few simple choices — earlier departures, off-peak months, nonstop routing, and awareness of your specific airport — materially improve the odds of getting where you’re going on time.
