Carrier route record
WNLBB→DEN
Southwest Airlines · Lubbock to Denver
- Flights
- 282
- Period
- September 2025 to August 2026
- Share of route
- 29%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Southwest Airlines.
Southwest on LBB to DEN earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 282 flights, with a median arrival 9 minutes early.
Set against the rest of the country, Southwest's LBB to DEN record is 13 points better than the US average of 77.3%. That gap is worth roughly 130 fewer late arrivals for every thousand flights.
Key figures
On time
90.3%
Arrivals under 15 minutes late, of 278 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
1.42%
National rate is 1.89%
Whole route
77.1%
Every carrier on LBB to DEN, 983 flights
These figures cover 282 flights between September 2025 and August 2026. The median arrival is 9 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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Carrier by carrier
Southwest against every carrier on LBB to DEN
Southwest flew 282 of the 983 flights on LBB to DEN, about 29% of it. Its 90.3% on time is 13 points better than the route as a whole, which runs 77.1%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Southwest at 90.3% to SkyWest at 71.8%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines (this page)thin sample | 282 | 90.3% | 74 min | 1.42% | A |
| SkyWest Airlines | 701 | 71.8% | 98 min | 1.57% | C |
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.
Departure window
When Southwest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 points, against half a point between the best and worst carrier.
- 5am–8am190 flights95.2%
- 8am–11am4 flights—
- 11am–2pm48 flights84.8%
- 2pm–5pm38 flights73.0%
- 5pm–8pm2 flights—
- 8pm–5am—
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 95.2% of the time, against 73.0% for the afternoon window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 190 flights scheduled in it.
Across the year
Southwest on LBB to DEN through the year
- Jul–Sep 202521 flights—
- Oct–Dec 202559 flights87.7%
- Jan–Mar 202658 flights87.5%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202653 flights86.8%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 90.3% on time across 282 flights.
Quarter by quarter Southwest on LBB to DEN held fairly steady: 87.7% in Oct–Dec 2025, 87.5% in Jan–Mar 2026, 96.7% in Apr–Jun 2026 and 86.8% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Saturday is the strongest day at 97.9% on time and Friday the weakest at 83.0%, a spread of 15 points.
Arrival by arrival
How late Southwest on LBB to DEN runs when it is late
The 27 late arrivals split 11 under half an hour, 7 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early60 flights21.6%
- Within 15 min191 flights68.7%
- 15–29 min late11 flights4.0%
- 30–59 min late7 flights2.5%
- 1–2 hours late5 flights1.8%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 278 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 21 departures that left 15 minutes late or more, only 2 made it up before arrival. 8 flights left on time and still arrived late.
The worst days
Worst days for Southwest on LBB to DEN
The latest arrival of the period was on 8 June 2026, 5 hours 3 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 June 2026 | 5 hours 3 minutes | Carrier |
| 14 August 2026 | 4 hours 43 minutes | National Airspace System |
| 17 July 2026 | 3 hours 46 minutes | Carrier |
| 9 July 2026 | 3 hours 16 minutes | Carrier |
| 17 February 2026 | 1 hour 58 minutes | Extreme weather |
Delay causes
Why Southwest runs late on this route
Carrier accounts for 52% of the 2,008 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 27%National Airspace System
- 16%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,040 of the 2,008 delay minutes reported here. The split is drawn from 2,008 reported delay minutes.
Cancellations sit at 1.42% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.2% 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.
At 456 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 60.4% on time across 280 flights, 30 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 30 points of difference.
One caution: this is a thin sample. 282 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 Southwest on LBB to DEN
Put together: treat all of this as provisional. 282 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 90.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 278 completed flights over 12 months sit behind that.
Related
Where to go next
- LBB to DEN, every carrier
- Southwest on DEN to LBB, the return leg
- SkyWest Airlines on LBB to DEN71.8%
- Southwest Airlines network-wide record
- Denver International (DEN) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- How to read this site: grades, sample sizes, and honest caveats
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.