Flight number record
DL 726
Delta Air Lines · Atlanta to Boston
- Route
- ATL → BOS
- Departs
- 13:45
- Flights
- 353
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 726, check with Delta Air Lines.
DL 726 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 353 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so DL 726 runs 11 points behind the country as a whole. Across a thousand flights that is about 110 extra late arrivals.
Key figures
On time
66.3%
Arrivals under 15 minutes late, of 347 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
1.42%
National rate is 1.89%
1 hour+ late
11.0%
National rate is 8.3%
These figures cover 353 flights between September 2025 and August 2026. Beyond the headline rate, 11.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 726 flies
DL 726 flies ATL to BOS without a single fixed slot. Its most common scheduled departure was 13:45, used on 102 of 353 flights, with 13:59 (62 flights) and 13:58 (52 flights) next.
- Departs 13:45102 flights28.9%
- Departs 13:5962 flights17.6%
- Departs 13:5852 flights14.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 726 runs 12 points worse at 66.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 726 next to ATL to BOS
Every carrier on ATL to BOS combined arrived on time 72.8% of the time across 5,054 flights, so DL 726 is 7 points behind it. Delta flew 3,731 flights on the same city pair under all its flight numbers, including this one, and those ran 74.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 726thin sample | 353 | 66.3% | 56 min | 1.42% | C |
| All Delta Air Lines on ATL–BOS | 3,731 | 74.4% | 61 min | 1.82% | C |
| All carriers on ATL–BOS | 5,054 | 72.8% | 66 min | 2.30% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 726 quarter by quarter
DL 726 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.1% on time and its weakest Jul–Sep 2025 at 50.0%, a swing of 32 points on roughly 71 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights50.0%
- Oct–Dec 202592 flights59.8%
- Jan–Mar 202682 flights82.1%
- Apr–Jun 202687 flights69.8%
- Jul–Sep 202662 flights59.0%
Scale runs 40% to 90%.
By weekday, DL 726 ranged from 61.7% on Sunday to 73.1% on Wednesday. With about 50 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 726 runs when it is late
The 117 late arrivals split 40 under half an hour, 39 between 30 and 60 minutes, and 38 an hour or more.
- 15+ min early62 flights17.9%
- Within 15 min168 flights48.4%
- 15–29 min late40 flights11.5%
- 30–59 min late39 flights11.2%
- 1–2 hours late27 flights7.8%
- 2+ hours late11 flights3.2%
Scale runs 0% to 100%.
Share of 347 completed flights by arrival against schedule.
29 of 124 late departures made up the time and arrived on time, 23% of them. In the other direction, 22 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BOS.
The worst days
Worst days for DL 726
The latest arrival of the period was on 13 October 2025, 4 hours 18 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in October 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 October 2025 | 4 hours 18 minutes | National Airspace System |
| 14 October 2025 | 4 hours 16 minutes | National Airspace System |
| 12 February 2026 | 2 hours 42 minutes | Carrier |
| 20 October 2025 | 2 hours 36 minutes | National Airspace System |
| 18 July 2026 | 2 hours 32 minutes | National Airspace System |
Delay causes
Why DL 726 runs late
National Airspace System accounts for 62% of the 6,541 delay minutes carriers reported here, and the remaining four split what is left.
- 62%National Airspace System
- 25%Carrier
- 11%Late-arriving aircraft
- 2%Extreme weather
62% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,035 minutes out of 6,541, against a national NAS share of 21%. The split is drawn from 6,541 delay minutes reported on DL 726.
Cancellations sit at 1.42% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
11.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 946 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 353 flights under DL 726 in the data flew ATL to BOS. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 353 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 726
For a booking, DL 726 is one of the weaker ways to fly ATL to BOS: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- ATL to BOS, every carrier and departure
- BOS to ATL, the return direction
- Delta Air Lines 855 on the same route85.2%
- Delta Air Lines 865 on the same route80.2%
- Delta Air Lines 821 on the same route69.2%
- Delta Air Lines 987 on the same route89.9%
- Delta Air Lines 350 on the same route74.6%
- Delta Air Lines 2595 on the same route62.5%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Boston Logan International (BOS) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.