Morning vs. Evening Flights: Which Has Fewer Delays? The Data Explains
DelayGuard Research Team. Published February 5, 2026. Updated October 15, 2026. 6 min read.
Figures checked against DelayGuard BTS tables on 2026-10-15.
Travel advice has long favored morning flights, and the BTS data supports it. Across US domestic flights from January 2023 to December 2025, 11.0% of flights scheduled to depart before 8 AM arrived 15 or more minutes late. For flights scheduled after 8 PM the figure was 28.7%, about 2.6 times as high. The network-wide rate for the period was 21.2%.
This article explains the pattern, which airports show the biggest gap, and how to use it when booking.
Short Answers
Are morning flights less likely to be delayed? Yes. In BTS data for January 2023 to December 2025, 11.0% of flights scheduled before 8 AM arrived 15+ minutes late, against 28.7% of flights scheduled after 8 PM.
Are evening flights more likely to be delayed? Yes. Flights scheduled after 8 PM arrived 15+ minutes late 28.7% of the time in BTS data for January 2023 to December 2025, against 21.2% across all flights.
Is the first flight of the day less likely to be delayed? Usually, yes. The aircraft has spent the night at the airport, so there is no late inbound flight to wait for. Flights scheduled before 6 AM arrived late 9.8% of the time.
What is the best time of day to fly to avoid delays? Early morning (about 5-8 AM) had the lowest late-arrival rate in the data. Delays build through the day as aircraft and crews carry earlier problems forward.
Does the time of day matter for connecting flights? Yes. A late first leg can cost you the connection. Flying the first leg early gives you more later flights to rebook onto if something goes wrong.
What Is the Best Time of Day to Fly?
Short answer: early morning (about 5-8 AM). Departures before 6 AM are the lowest row in the table below, at 9.8%. Red-eye flights from midnight to 5 AM run late about 19–22% of the time, so earlier than that bank is not better. (Based on BTS data, Jan 2023 to Dec 2025.)
Why, from a pilot's seat: the first flight of the day usually starts with an aircraft that sat at the gate overnight and a crew that has just started duty. Nothing earlier in the day can make it late. By evening, the same aircraft may already have flown several legs, so a thunderstorm in one city or a slow turnaround in another adds up, and each delay passes to the next flight. Late flights also have fewer options when something goes wrong: fewer spare aircraft, crews close to their duty limits, and fewer later flights to rebook onto.
How to use it:
- Book an early-morning departure (about 5-8 AM), especially in summer thunderstorm season and on peak holiday days.
- On a connecting trip, put the riskiest leg first. That's the leg into a busy hub or a weather-prone airport, and an early start leaves you more ways to recover.
- If an evening flight is your only option, give the connection extra time and check your flight's risk before you go.
- Check the specific flight, not just the hour. Airport, airline, route and season all matter. DelayGuard's predictor scores flights across 80 US airports and 14 US airlines.
The Time-of-Day Delay Data
The table shows the share of flights that arrived 15 or more minutes late, by scheduled departure window, for all flights reported to BTS between January 2023 and December 2025 (about 20.6 million flights).
| Scheduled departure | Share of flights arriving 15+ min late |
|---|---|
| Before 6 AM | 9.8% |
| 6 AM to 8 AM | 11.2% |
| 8 AM to 10 AM | 14.7% |
| 10 AM to noon | 17.4% |
| Noon to 2 PM | 20.7% |
| 2 PM to 4 PM | 24.9% |
| 4 PM to 6 PM | 28.3% |
| 6 PM to 8 PM | 30.1% |
| After 8 PM | 28.7% |
Source: BTS On-Time Reporting, January 2023 to December 2025, local scheduled departure time. Cancelled and diverted flights are excluded.
The rate climbs through the day from 9.8% before 6 AM to a peak of 30.1% between 6 PM and 8 PM. It then eases slightly after 8 PM (28.7%). Before 10 AM, delay rates stay below 15%. After 2 PM they are above 24%.
These are network averages across all airports and airlines. They do not compare the same route at different times.
Why Mornings Are More Reliable: Schedule Propagation
Every aircraft flies several legs a day, and each leg depends on the one before. BTS records late-arriving aircraft as one of its delay causes: the previous flight with the same aircraft arrived late, so the next departure is late. A disruption in the morning, such as a mechanical issue, a weather ground stop or a late crew, carries forward through the aircraft's remaining legs.
The first flight of the day breaks that chain. The aircraft has spent the night at the airport and there is no inbound flight to wait for. This is the structural advantage of early departures, and it is consistent with the steady climb in the table above.
Airports Where Morning Matters Most
The gap between early and late flights differs by airport. The table compares flights scheduled before 10 AM with flights scheduled after 4 PM.
| Airport | Scheduled before 10 AM | Scheduled after 4 PM | Gap |
|---|---|---|---|
| Newark Liberty (EWR) | 14.2% | 32.5% | 18.3 points |
| Chicago O'Hare (ORD) | 16.5% | 31.7% | 15.2 points |
| LaGuardia (LGA) | 11.5% | 28.6% | 17.1 points |
| John F. Kennedy (JFK) | 15.3% | 30.2% | 14.9 points |
| Miami (MIA) | 12.4% | 34.4% | 22.0 points |
| Phoenix (PHX) | 10.9% | 25.0% | 14.2 points |
| Seattle-Tacoma (SEA) | 15.3% | 23.9% | 8.6 points |
Source: BTS On-Time Reporting, January 2023 to December 2025. Per-airport figures are on each airport page.
At every airport shown, the later window runs late far more often. Miami has the widest gap in this table (22.0 points), followed by Newark (18.3) and LaGuardia (17.1). Seattle has the narrowest (8.6), though the direction is the same.
The Connection Multiplier
A connection gives a delay two chances to happen, and a missed connection costs far more than a late arrival. Allow more buffer for afternoon and evening connections, and more again at the airports with the highest delay rates in the airport rankings. The right minimum connection time depends on the airline, the airport and whether you rebook on the same ticket, so check your airline's published minimums. How often inbound flights at ORD, ATL, DFW, DEN and CLT arrived late is in the tight connection guide.
How to Apply This When Booking
Book the first departure of the day when you have a hard arrival time such as a cruise, an international connection or a meeting, or when you are flying through an airport with a high delay rate.
Morning is not a guarantee. An 8 AM departure on a day with a forecast storm can carry more risk than a clear-weather 4 PM flight. Time of day is a strong prior, and current conditions take precedence.
Knowing Your Specific Flight's Risk
The time-of-day data gives you a prior. Your airline, route, date and the weather change it. DelayGuard combines these into a flight-specific risk estimate.
Related Delay Data
- Most delayed US airports
- Airline on-time rankings
- AI flight delay prediction tool
- How DelayGuard predicts flight delays
- Which Bay Area airport to fly from
Data: BTS On-Time Reporting, January 2023 to December 2025. Delay means arriving 15 or more minutes after scheduled arrival.