Flight number record

WN 1628

Southwest Airlines · Dallas to Houston

Route: DAL → HOU
Departs: 06:00
Flights: 273
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 16 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 273 flights, with a median arrival 11 minutes early.

Set against the rest of the country, WN 1628's record is 16 points better than the US average of 77.6%. That gap is worth roughly 157 fewer late arrivals for every thousand flights.

On time

93.3%

Arrivals under 15 minutes late, of 270 completed flights

Avg delay

47 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

1.9%

National rate is 8.1%

These figures cover 273 flights between July 2025 and June 2026. The median arrival is 11 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.

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 250 of the 273 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 06:00250 flights91.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 4 points better at 93.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

WN 1628 next to DAL to HOU

Every carrier on DAL to HOU combined arrived on time 74.1% of the time across 4,063 flights, so WN 1628 is 19 points ahead of it. Across its whole network Southwest Airlines managed 76.6%, which this flight beats by 17 points.

WN 1628 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
WN 1628thin sample	273	93.3%	47 min	1.10%	A
All Southwest Airlines on DAL–HOU	4,063	74.1%	57 min	1.82%	C
All carriers on DAL–HOU	4,063	74.1%	57 min	1.82%	C
Southwest Airlines, whole network	1,390,634	76.6%	54 min	0.89%	B+

Across the year

WN 1628 quarter by quarter

Quarter by quarter WN 1628 held fairly steady: 97.1% in Jul–Sep 2025, 94.9% in Oct–Dec 2025, 92.3% in Jan–Mar 2026 and 89.9% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202570 flights97.1%
Oct–Dec 202560 flights94.9%
Jan–Mar 202653 flights92.3%
Apr–Jun 202690 flights89.9%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, WN 1628 ranged from 87.1% on Sunday to 97.7% on Thursday. With about 39 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.

Delay causes

Why WN 1628 runs late

One category carries most of the weight here. National Airspace System accounts for 56% of the 851 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
56%
Carrier
36%
Extreme weather
8%

56% 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 477 minutes out of 851, against a national NAS share of 21%. The split is drawn from 851 delay minutes reported on WN 1628.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.9% land an hour or more behind schedule, against 8.1% 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 273 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. 273 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: 93.3% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures