Flight number record
DL 2644
Delta Air Lines · Minneapolis to Houston
- Route
- MSP → IAH
- Departs
- 14:45
- Flights
- 296
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2644, check with Delta Air Lines.
DL 2644 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 296 flights, with a median arrival 7 minutes early.
Key figures
On time
79.0%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.68%
National rate is 1.89%
1 hour+ late
8.3%
National rate is 8.3%
These figures cover 296 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 2644 flies
DL 2644 flies MSP to IAH without a single fixed slot. Its most common scheduled departure was 14:45, used on 56 of 296 flights, with 12:50 (36 flights) next.
- Departs 14:4556 flights18.9%
- Departs 12:5036 flights12.2%
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 14:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2644 runs 7 points better at 79.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2644 next to MSP to IAH
Every carrier on MSP to IAH combined arrived on time 82.2% of the time across 1,940 flights, so DL 2644 is 3 points behind it. Delta flew 1,278 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 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2644thin sample | 296 | 79.0% | 63 min | 0.68% | B+ |
| All Delta Air Lines on MSP–IAH | 1,278 | 79.7% | 62 min | 0.94% | B+ |
| All carriers on MSP–IAH | 1,940 | 82.2% | 62 min | 0.88% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2644 quarter by quarter
DL 2644 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 70.5%, a swing of 23 points on roughly 59 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 flights93.3%
- Oct–Dec 202582 flights70.5%
- Jan–Mar 202661 flights83.3%
- Apr–Jun 202674 flights78.1%
- Jul–Sep 202649 flights79.6%
Scale runs 60% to 100%.
By weekday, DL 2644 did best on Wednesday at 87.5% on time and worst on Sunday at 60.0%. Each day rests on about 42 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2644 runs when it is late
DL 2644 often beats the schedule: 80 of 290 completed flights, 28%, arrived 15 minutes or more early. The 61 late arrivals split 24 under half an hour, 13 between 30 and 60 minutes, and 24 an hour or more.
- 15+ min early80 flights27.6%
- Within 15 min149 flights51.4%
- 15–29 min late24 flights8.3%
- 30–59 min late13 flights4.5%
- 1–2 hours late19 flights6.6%
- 2+ hours late5 flights1.7%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
14 of 58 late departures made up the time and arrived on time, 24% of them. In the other direction, 17 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 IAH.
The worst days
Worst days for DL 2644
The latest arrival of the period was on 31 July 2026, 5 hours 50 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 |
|---|---|---|
| 31 July 2026 | 5 hours 50 minutes | Carrier |
| 8 March 2026 | 5 hours 20 minutes | Carrier |
| 11 March 2026 | 3 hours 54 minutes | National Airspace System |
| 27 November 2025 | 3 hours 6 minutes | Carrier |
| 5 April 2026 | 2 hours 6 minutes | Carrier |
Delay causes
Why DL 2644 runs late
Carrier accounts for 49% of the 3,859 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 34%National Airspace System
- 16%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,909 of the 3,859 delay minutes reported here. The split is drawn from 3,859 delay minutes reported on DL 2644.
Cancellations are rare at 0.68%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
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 about an hour, which a normal layover absorbs.
The 1,034 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 two other city pairs in the data, including IAH to MSP (16) and DTW to BHM (3), but none flew often enough under DL 2644 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MSP to IAH only.
One caution: this is a thin sample. 296 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 2644
For a booking, read DL 2644 as 79.0% on time with 0.68% cancelled over 296 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MSP to IAH, every carrier and departure
- IAH to MSP, the return direction
- Delta Air Lines 2683 on the same route72.7%
- Delta Air Lines 2656 on the same route86.8%
- Minneapolis-St Paul International (MSP) delay statistics
- George Bush Intercontinental (IAH) 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.