Flight number record
WN 1628
Southwest Airlines · Dallas to Houston
- Route
- DAL → HOU
- Departs
- 06:00
- Flights
- 283
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s WN 1628, check with Southwest Airlines.
WN 1628 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 45 minutes. That rests on 283 flights, with a median arrival 10 minutes early.
Set against the rest of the country, WN 1628's record is 17 points better than the US average of 77.3%. That gap is worth roughly 166 fewer late arrivals for every thousand flights.
Key figures
On time
93.9%
Arrivals under 15 minutes late, of 279 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
1.06%
National rate is 1.89%
1 hour+ late
1.4%
National rate is 8.3%
These figures cover 283 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When WN 1628 flies
WN 1628 is scheduled to leave Dallas (DAL) at 06:00 local time and reach Houston (HOU) at 07:10. That slot held for 257 of the 283 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00257 flights90.8%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and WN 1628 runs 5 points better at 93.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
WN 1628 next to DAL to HOU
Every carrier on DAL to HOU combined arrived on time 74.8% of the time across 4,044 flights, so WN 1628 is 19 points ahead of it. Across its whole network Southwest Airlines managed 75.7%, which this flight beats by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| WN 1628thin sample | 283 | 93.9% | 44 min | 1.06% | A |
| All Southwest Airlines on DAL–HOU | 4,044 | 74.8% | 54 min | 1.95% | C |
| All carriers on DAL–HOU | 4,044 | 74.8% | 54 min | 1.95% | C |
| Southwest Airlines, whole network | 1,391,794 | 75.7% | 53 min | 0.92% | B+ |
Across the year
WN 1628 quarter by quarter
Quarter by quarter WN 1628 held fairly steady: 94.9% in Oct–Dec 2025, 92.3% in Jan–Mar 2026, 89.9% in Apr–Jun 2026 and 98.2% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202522 flights—
- Oct–Dec 202560 flights94.9%
- Jan–Mar 202653 flights92.3%
- Apr–Jun 202690 flights89.9%
- Jul–Sep 202658 flights98.2%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, WN 1628 ranged from 88.9% on Sunday to 100.0% on Wednesday. With about 40 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 WN 1628 runs when it is late
WN 1628 often beats the schedule: 76 of 279 completed flights, 27%, arrived 15 minutes or more early. The 17 late arrivals split 6 under half an hour, 7 between 30 and 60 minutes, and 4 an hour or more.
- 15+ min early76 flights27.2%
- Within 15 min186 flights66.7%
- 15–29 min late6 flights2.2%
- 30–59 min late7 flights2.5%
- 1–2 hours late3 flights1.1%
- 2+ hours late1 flights0.4%
Scale runs 0% to 100%.
Share of 279 completed flights by arrival against schedule.
Only 14 of 279 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for WN 1628
The latest arrival of the period was on 21 June 2026, 2 hours 2 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 June 2026 | 2 hours 2 minutes | National Airspace System |
| 24 November 2025 | 1 hour 17 minutes | National Airspace System |
| 2 April 2026 | 1 hour 9 minutes | National Airspace System |
| 20 December 2025 | 1 hour 3 minutes | Carrier |
| 21 March 2026 | 56 minutes | Carrier |
Delay causes
Why WN 1628 runs late
National Airspace System accounts for 54% of the 749 delay minutes carriers reported here, and the remaining four split what is left.
- 54%National Airspace System
- 37%Carrier
- 9%Extreme weather
54% 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 408 minutes out of 749, against a national NAS share of 21%. The split is drawn from 749 delay minutes reported on WN 1628.
Cancellations sit at 1.06% against a national 1.89%, which is ordinary. Diversions add another 0.35%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 1.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
Every one of the 283 flights under WN 1628 in the data flew DAL to HOU. 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. 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.
What to do with this
Booking WN 1628
For a booking, WN 1628 has one of the better records a US domestic flight can show: 93.9% on time and 1.06% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DAL to HOU, every carrier and departure
- HOU to DAL, the return direction
- Dallas Love Field (DAL) delay statistics
- William P. Hobby (HOU) delay statistics
- Southwest Airlines on-time record
- Every Southwest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means Southwest Airlines’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.