Flight number record
DL 2735
Delta Air Lines · Atlanta to Hartford
- Route
- ATL → BDL
- Departs
- 15:40
- Flights
- 307
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2735, check with Delta Air Lines.
DL 2735 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land roughly 50 minutes behind schedule. That rests on 307 flights, with a median arrival right on schedule.
Key figures
On time
74.7%
Arrivals under 15 minutes late, of 300 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
1.95%
National rate is 1.89%
1 hour+ late
8.3%
National rate is 8.3%
These figures cover 307 flights between September 2025 and August 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2735 flies
DL 2735 flies ATL to BDL without a single fixed slot. Its most common scheduled departure was 15:40, used on 36 of 307 flights, with 15:39 (33 flights) and 15:49 (31 flights) next.
- Departs 15:4036 flights11.7%
- Departs 15:3933 flights10.7%
- Departs 15:4931 flights10.1%
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 15:40 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2735 runs 3 points better at 74.7%. 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 2735 next to ATL to BDL
Every carrier on ATL to BDL combined arrived on time 79.6% of the time across 2,310 flights, so DL 2735 is 5 points behind it. Delta flew 2,218 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2735thin sample | 307 | 74.7% | 52 min | 1.95% | C |
| All Delta Air Lines on ATL–BDL | 2,218 | 79.7% | 57 min | 1.98% | B |
| All carriers on ATL–BDL | 2,310 | 79.6% | 58 min | 1.99% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2735 quarter by quarter
DL 2735 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.4% on time and its weakest Jul–Sep 2026 at 58.1%, a swing of 27 points on roughly 77 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 flights—
- Oct–Dec 202588 flights74.4%
- Jan–Mar 202644 flights73.2%
- Apr–Jun 202683 flights85.4%
- Jul–Sep 202662 flights58.1%
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2735 did best on Monday at 84.8% on time and worst on Tuesday at 61.7%. Each day rests on about 44 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2735 runs when it is late
The 76 late arrivals split 28 under half an hour, 23 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early25 flights8.3%
- Within 15 min199 flights66.3%
- 15–29 min late28 flights9.3%
- 30–59 min late23 flights7.7%
- 1–2 hours late20 flights6.7%
- 2+ hours late5 flights1.7%
Scale runs 0% to 100%.
Share of 300 completed flights by arrival against schedule.
9 of 65 late departures made up the time and arrived on time, 14% of them. In the other direction, 20 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 BDL.
The worst days
Worst days for DL 2735
The latest arrival of the period was on 26 May 2026, 2 hours 52 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across May, November, April, June and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 May 2026 | 2 hours 52 minutes | Carrier |
| 8 November 2025 | 2 hours 48 minutes | National Airspace System |
| 28 April 2026 | 2 hours 34 minutes | Late-arriving aircraft |
| 18 June 2026 | 2 hours 32 minutes | National Airspace System |
| 4 August 2026 | 2 hours 17 minutes | Carrier |
Delay causes
Why DL 2735 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,912 reported delay minutes.
- 34%Carrier
- 30%National Airspace System
- 28%Late-arriving aircraft
- 7%Extreme weather
- 1%Security
No single cause dominates. carrier at 34%, national airspace system at 30% and late-arriving aircraft at 28% split the 3,912 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around. The split is drawn from 3,912 delay minutes reported on DL 2735.
Cancellations sit at 1.95% against a national 1.89%, which is ordinary. Diversions add another 0.33%.
Connections and routes
What a delay on this flight costs
8.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.
The 859 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.
The same number turns up on one other city pair in the data, including BDL to ATL (187), but none flew often enough under DL 2735 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to BDL only.
One caution: this is a thin sample. 307 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 2735
For a booking, read DL 2735 as 74.7% on time with 1.95% cancelled over 307 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to BDL, every carrier and departure
- BDL to ATL, the return direction
- Delta Air Lines 1011 on the same route73.7%
- Delta Air Lines 2951 on the same route90.4%
- Delta Air Lines 1082 on the same route88.3%
- Delta Air Lines 2765 on the same route74.0%
- Delta Air Lines 2739 on the same route83.7%
- Hartsfield-Jackson Atlanta International (ATL) 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
- Connecting flights: how much buffer the data says you need
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.