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Route · IAH → TYS · 2020–2025 BTS data

Houston to Knoxville

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to TYS (Houston to Knoxville) ranks #4849 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

91.1%
On-time
+12.1 pts
vs US avg
57 min
Delay when late
560
Flights
#4849 of 4927
Corpus placement

Cancelled

4.5%

Best Month

Sep 2020 96%

Worst Month

Jan 2020 86%

Distance

771 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Oct 2020 31 5 0 0 OO
Sep 2020 85 3 0 0 YV,EV
Aug 2020 60 4 3 1 EV
Jul 2020 31 7 0 0 EV
Jun 2020 30 3 0 0 EV
May 2020 31 2 0 0 EV
Apr 2020 36 1 7 0 EV
Mar 2020 89 4 15 0 EV,YV
Feb 2020 80 9 0 0 YV,EV
Jan 2020 87 12 0 1 YV,EV

IAH–TYS seasonal on-time pattern

Best: April (97.2%) · weakest: July (77.4%)

75%80%85%90%95%100% JanFebMarAprMayJunJulAugSepOct 83.9%

Strongest calendar month

April

97.2% on-time · ~36 flights/mo

Busiest calendar month

March

~89 flights/mo avg

Weakest calendar month

July

77.4% on-time · ~31 flights/mo

Cancellation Rate

4.5%

25 of 560 flights

Diversion Rate

0.4%

2 of 560 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

IAH - Houston

Full on-time, delay-cause, and seasonal performance for Houston, TX.

IAH on-time profile

TYS - Knoxville

Full on-time, delay-cause, and seasonal performance for Knoxville, TN.

TYS on-time profile

Compare the two airports

See IAH and TYS side by side on delays, cancellations, and reliability.

Compare IAH vs TYS

Origin-hub reliability standing

Among IAH's stronger departures

IAH → TYS posts a 91.1% on-time rate, landing in the ≥85% band with 17 of 102 BTS-tracked routes leaving Houston. The same hub also shows 79 mid-band and 6 challenged departures · fleet-wide on-time rank #88 of 4927 (highest on-time = #1).

What the Data Says About IAH to TYS

Houston to Knoxville (IAH to TYS) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 91.1% on-time rate across 560 flights, with delays that do happen averaging 56.9 minutes. The corridor runs roughly 771 miles and is served by 4 carriers. Over the most recent 24 months, 25 of 560 flights were cancelled (4.5%) and 2 diverted (0.4%).

Monthly performance varies moderately here: Sep 2020 was the strongest month at 96% on-time versus Jan 2020 at 86%, a 10-point difference.

On the multi-year calendar, IAH–TYS peaks in April at 97.2% on-time while March carries the heaviest traffic (~89 flights per month) ; the softest month is July at 77.4%, a 19.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does IAH to TYS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, IAH to TYS ranks #4849 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from IAH to TYS? ▼
Flights from Houston to Knoxville have a 91.1% on-time rate based on 560 flights. The average delay is 56.9 minutes. The best recent month was Sep 2020 with 96% on-time.
What is the cancellation rate for IAH to TYS? ▼
Over the last 24 months, 4.5% of flights on this route were cancelled (25 of 560 flights) and 0.4% were diverted.
How far is the flight from IAH to TYS? ▼
The flight distance from Houston (IAH) to Knoxville (TYS) is approximately 771 miles. This route is served by 4 carriers.
When is the best time to fly from IAH to TYS? ▼
The best recent month for on-time performance was Sep 2020 (96% on-time). The worst was Jan 2020 (86% on-time). Consider booking during months with historically better performance.

Airports on this route

IAH Airport

Houston
TYS Airport

Knoxville
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using IAH–TYS data

IAH–TYS runs 12.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare IAH and TYS airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
  • If your dates flex, April (97.2% on-time) beats July (77.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 91.1% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.