Flight number record
DL 2620
Delta Air Lines · Tulsa to Atlanta
- Route
- TUL → ATL
- Departs
- 12:41
- Flights
- 283
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2620, check with Delta Air Lines.
DL 2620 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 2.3 hours on average. That rests on 283 flights, with a median arrival 17 minutes early.
Set against the rest of the country, DL 2620's record is 6 points better than the US average of 77.3%. That gap is worth roughly 61 fewer late arrivals for every thousand flights.
Key figures
On time
83.4%
Arrivals under 15 minutes late, of 277 completed flights
Avg delay
135 min
Across delayed arrivals only, not all flights
Cancelled
1.41%
National rate is 1.89%
1 hour+ late
9.7%
National rate is 8.3%
These figures cover 283 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2620 flies
DL 2620 flies TUL to ATL without a single fixed slot. Its most common scheduled departure was 12:41, used on 52 of 283 flights, with 13:56 (48 flights) and 13:51 (32 flights) next.
- Departs 12:4152 flights18.4%
- Departs 13:5648 flights17.0%
- Departs 13:5132 flights11.3%
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 12:41 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 2620 runs 5 points better at 83.4%. 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 2620 next to TUL to ATL
Every carrier on TUL to ATL combined arrived on time 87.7% of the time across 1,573 flights, so DL 2620 is 4 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2620thin sample | 283 | 83.4% | 135 min | 1.41% | B |
| All Delta Air Lines on TUL–ATL | 1,573 | 87.7% | 122 min | 2.42% | A |
| All carriers on TUL–ATL | 1,573 | 87.7% | 122 min | 2.42% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2620 quarter by quarter
DL 2620 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.6% on time and its weakest Jan–Mar 2026 at 77.8%, a swing of 11 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.
- Oct–Dec 202566 flights84.6%
- Jan–Mar 202683 flights77.8%
- Apr–Jun 202680 flights88.6%
- Jul–Sep 202654 flights82.7%
Scale runs 70% to 95%.
By weekday, DL 2620 did best on Wednesday at 95.2% on time and worst on Sunday at 71.4%. Each day rests on about 40 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2620 runs when it is late
DL 2620 often beats the schedule: 161 of 277 completed flights, 58%, arrived 15 minutes or more early. When DL 2620 is late it tends to be very late: 27 of its 46 late arrivals were an hour or more behind, and 16 were two hours or more.
- 15+ min early161 flights58.1%
- Within 15 min70 flights25.3%
- 15–29 min late10 flights3.6%
- 30–59 min late9 flights3.2%
- 1–2 hours late11 flights4.0%
- 2+ hours late16 flights5.8%
Scale runs 0% to 100%.
Share of 277 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 49 departures that left 15 minutes late or more, only 5 made it up before arrival. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 2620
The latest arrival of the period was on 25 August 2026, 10 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 August 2026 | 10 hours 35 minutes | Carrier |
| 27 August 2026 | 10 hours 31 minutes | Carrier |
| 11 January 2026 | 8 hours 51 minutes | Carrier |
| 10 January 2026 | 5 hours 57 minutes | Carrier |
| 17 March 2026 | 5 hours 26 minutes | Late-arriving aircraft |
Delay causes
Why DL 2620 runs late
Carrier accounts for 56% of the 6,219 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 38%Late-arriving aircraft
- 6%National Airspace System
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,219 reported delay minutes here, that single category outweighs weather by 38 to one. The split is drawn from 6,219 delay minutes reported on DL 2620.
Cancellations sit at 1.41% against a national 1.89%, which is ordinary. Diversions add another 0.71%.
Connections and routes
What a delay on this flight costs
9.7% 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 674 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.
DL 2620 is not only a TUL to ATL flight. It also flew ATL to TUL (279 flights, 84.6% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 283 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ATL to TULthin sample | 279 | 84.6% | 85 min | 2.15% | B |
What to do with this
Booking DL 2620
For a booking, read DL 2620 as 83.4% on time with 1.41% cancelled over 283 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- TUL to ATL, every carrier and departure
- ATL to TUL, the return direction
- Delta Air Lines 1259 on the same route93.1%
- Delta Air Lines 2754 on the same route93.2%
- Delta Air Lines 1186 on the same route83.8%
- 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
- Why the first flight of the morning is statistically safest
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.