Route reliability record
DFW→STL
Dallas-Fort Worth to St. Louis
- Flights
- 2,382
- Period
- July 2025 to June 2026
- Distance
- 550 mi
- Carriers
- 5
This route sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 2,382 flights, with a median arrival 1 minutes early.
The national on-time rate over the same period is 77.6%, so this route runs 8 points behind the country as a whole. Across a thousand flights that is about 82 extra late arrivals.
Key figures
On time
69.4%
Arrivals under 15 minutes late, of 2,301 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
3.11%
National rate is 1.81%
Best carrier
American
65.7% on time across 1,852 flights
These figures cover 2,382 flights between July 2025 and June 2026. Beyond the headline rate, 13.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Which airline is most reliable on DFW to STL
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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 80 | 88.8% | 47 min | 0.00% | A+ |
| Envoy Airthin sample | 301 | 88.4% | 47 min | 2.66% | A |
| PSA Airlinesthin sample | 51 | 69.6% | 64 min | 7.84% | C− |
| American Airlines | 1,852 | 65.7% | 86 min | 3.29% | C− |
| SkyWest Airlinesthin sample | 98 | 63.5% | 83 min | 1.02% | D |
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am345 flights83.1%
- 8am–11am415 flights77.2%
- 11am–2pm268 flights80.5%
- 2pm–5pm511 flights59.8%
- 5pm–8pm465 flights61.2%
- 8pm–5am378 flights63.2%
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 83.1% of the time, against 59.8% for the afternoon window. That is 23 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 511 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 27 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
August is the worst month at 55.6% on time, 27 points below February, the best at 83.1%. 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. June was the busiest month here, with 240 flights.
Across the week, Tuesday is the strongest day at 75.7% on time and Sunday the weakest at 59.2%. 17 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Late-arriving aircraft accounts for 55% of the 58,000 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.
- 55%Late-arriving aircraft
- 29%Carrier
- 9%Extreme weather
- 8%National Airspace System
- 0%Security
55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 58,000 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 58,398 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 83.1% on time here.
Cancellations run at 3.11%, against 1.81% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 550 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 74.5% on time across 2,380 flights, 5 points above 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 5 points of difference.
The sample behind these figures is 2,382 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.11% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 2,301 completed flights over 12 months sit behind that.
Common questions
DFW to STL questions
How often is DFW to STL delayed?
Roughly one flight in three arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 30.6% of the 2,382 flights in this analysis, against 22.4% nationally. Delayed flights are late by an hour and a half on average.
How reliable is DFW to STL compared with the rest of the country?
69.4% of flights arrive on time here against a national 77.6%, a difference of 8 points against it. That is worth a C− on this site's grading scale.
What time of day has the fewest delays on DFW to STL?
The 5am–8am departure window is the strongest at 83.1% on time. The 2pm–5pm window is the weakest at 59.8%, 23 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are August delays on DFW to STL?
August is the weakest month at 55.6% on time, compared with 83.1% in February. Across the year that is 27 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- STL to DFW — the return legseparate record
- Dallas/Fort Worth International (DFW) delay statistics
- St. Louis Lambert International (STL) delay statistics
- Frontier Airlines on-time record88.8%
- Envoy Air on-time record88.4%
- PSA Airlines on-time record69.6%
- Why the first flight of the morning is statistically safest
- What a cancellation rate actually tells you (and what it hides)
Direction matters. DFW to STL and STL to DFW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.