STL to ATL flight delays & on-time performance
Nonstop flights from St. Louis Lambert International Airport to Hartsfield Jackson Atlanta International Airport · 484 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL or ATL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from St. Louis (STL) to Atlanta (ATL) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.7% were cancelled, and 6% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (89% on time); Frontier Airlines was the least (60%).
- Departures scheduled around 8am did best (97% on time); around 7pm did worst (67%).
- Wednesday was the most reliable day to fly (92% on time) and Sunday the least (79%).
- The largest source of delay minutes was late-arriving aircraft (45%).
Which airline is most on time from STL to ATL?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 89% | 2.0% | 9 min | 4.2% | 2,357 |
| Southwest Airlines | 80% | 1.1% | 12 min | 6.2% | 1,105 |
| Frontier Airlines | 60% | 1.8% | 40 min | 16.6% | 222 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am95%363 flights
- 7am95%450 flights
- 8am97%115 flights
- 9am95%279 flights
- 10am92%359 flights
- 11am87%212 flights
- 12pm83%91 flights
- 1pm84%312 flights
- 2pm78%71 flights
- 3pm83%278 flights
- 4pm68%249 flights
- 5pm79%344 flights
- 6pm76%282 flights
- 7pm67%178 flights
- 8pm68%94 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday82%1.8% cancelled
- Tuesday87%0.8% cancelled
- Wednesday92%0.4% cancelled
- Thursday88%0.7% cancelled
- Friday85%1.9% cancelled
- Saturday82%3.1% cancelled
- Sunday79%3.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft45%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion16%
- Extreme weather5%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)67%
- Extreme weather31%
- Air traffic control & airport congestion2%
- Security0%
STL to ATL: common questions
- How often are STL to ATL flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from St. Louis to Atlanta cancelled?
- 1.7% of scheduled flights were cancelled (64 of 3,684).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 72 min behind schedule on average, and 5.5% of flights were an hour or more late.
- How long is taxi time at STL?
- Flights on this route spent 11 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ATL to STL — 82% on time
More flights from St. Louis
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STL → ATL, nonstop flights by US airlines that report to the DOT. How we calculate this.