Carrier route record
UABNA→IAH
United Airlines · Nashville to Houston
- Flights
- 1,051
- Period
- September 2025 to August 2026
- Share of route
- 74%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on BNA to IAH lands a B+, 3 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 a little over an hour on average. That rests on 1,051 flights, with a median arrival 10 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate United on BNA to IAH from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.7%
Arrivals under 15 minutes late, of 1,041 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.76%
National rate is 1.89%
Whole route
82.3%
Every carrier on BNA to IAH, 1,428 flights
These figures cover 1,051 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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Carrier by carrier
United against every carrier on BNA to IAH
United flew 1,051 of the 1,428 flights on BNA to IAH, most of the route. Its 80.7% on time is 2 points worse than the route as a whole, which runs 82.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 86.9% to United at 80.7%.
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 |
|---|---|---|---|---|---|
| SkyWest Airlines | 377 | 86.9% | 96 min | 1.06% | A |
| United Airlines (this page) | 1,051 | 80.7% | 73 min | 0.76% | B+ |
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Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am226 flights87.2%
- 8am–11am193 flights91.6%
- 11am–2pm177 flights84.1%
- 2pm–5pm255 flights70.4%
- 5pm–8pm198 flights72.4%
- 8pm–5am2 flights—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 91.6% of the time, against 70.4% for the afternoon window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 255 flights scheduled in it.
Across the year
United on BNA to IAH through the year
June is the worst month at 63.1% on time, 33 points below September, the best at 96.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. August was the busiest month here, with 109 flights.
Across the week, Tuesday is the strongest day at 87.4% on time and Friday the weakest at 75.4%, a spread of 12 points.
Arrival by arrival
How late United on BNA to IAH runs when it is late
United on BNA to IAH often beats the schedule: 437 of 1,041 completed flights, 42%, arrived 15 minutes or more early. The 201 late arrivals split 77 under half an hour, 57 between 30 and 60 minutes, and 67 an hour or more.
- 15+ min early437 flights42.0%
- Within 15 min403 flights38.7%
- 15–29 min late77 flights7.4%
- 30–59 min late57 flights5.5%
- 1–2 hours late36 flights3.5%
- 2+ hours late31 flights3.0%
Scale runs 0% to 100%.
Share of 1,041 completed flights by arrival against schedule.
46 of 187 late departures made up the time and arrived on time, 25% of them. In the other direction, 60 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 United on BNA to IAH
The latest arrival of the period was on 6 March 2026, 18 hours 22 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 |
|---|---|---|
| 6 March 2026 | 18 hours 22 minutes | Carrier |
| 16 March 2026 | 15 hours 40 minutes | Extreme weather |
| 17 October 2025 | 5 hours 47 minutes | Carrier |
| 10 July 2026 | 5 hours 25 minutes | Carrier |
| 30 April 2026 | 4 hours 42 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 15,000 reported delay minutes.
- 35%Late-arriving aircraft
- 34%Carrier
- 23%National Airspace System
- 8%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 15,000 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 14,666 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 91.6% on time here.
Cancellations are rare at 0.76%, 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 stage length
What a delay here costs
6.4% 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 a little over an hour, which a normal layover absorbs.
The 657 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 return leg is a different operation and performs like one: it runs 74.7% on time across 1,053 flights, 6 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 6 points of difference.
One caution: this is a thin sample. 1,051 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 United on BNA to IAH
Put together: treat all of this as provisional. 1,051 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 80.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,041 completed flights over 12 months sit behind that.
Related
Where to go next
- BNA to IAH, every carrier
- United on IAH to BNA, the return leg
- SkyWest Airlines on BNA to IAH86.9%
- United Airlines network-wide record
- Nashville International (BNA) delay statistics
- George Bush Intercontinental (IAH) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.