How delayed is St. Louis, MO (STL)?

St. Louis, MO has an on-time rate of 80.2%. The average delay is 13.0 min.

What causes delays at STL?

The main delay causes at STL are carrier issues (33.4%), weather (3.9%), NAS/air traffic control (19.1%), and late arriving aircraft (43.5%).

What is the best time to fly from STL?

The best time to fly from STL is at 5:00 with a 90.1% on-time rate. Sep is the best month with 86.4% on-time flights.

St. Louis, MO

St. Louis, MO, MO — STL

On-Time Rate

80.2%

2019-2025

Avg Delay

13.0 min

when delayed

Cancel Rate

2.3%

flights cancelled

Total Flights

401,824

2019-2025

Best Month

Sep

86.4% on-time

Worst Month

Jul

74.8% on-time

Best Departure Time

5:00

90.1% on-time

12-Month On-Time Trend

Delay Causes

Best Time to Fly (By Hour)

Seasonal Pattern

Airlines at STL

Airline	Flights	On-Time	Avg Delay
Southwest Airlines	243,225	79.5%	N/A
American Airlines	41,879	80.2%	N/A
Delta Air Lines	31,349	88.5%	N/A
Republic Airways	16,846	83.6%	N/A
SkyWest Airlines	14,431	80.8%	N/A
United Airlines	9,737	75.6%	N/A
Envoy Air	8,857	77.9%	N/A
Endeavor Air	8,241	82.5%	N/A
Frontier Airlines	7,786	72.6%	N/A
PSA Airlines	7,673	81.1%	N/A

Most Delayed Routes

Destination	On-Time
STL → PBIWest Palm Beach/Palm Beach, FL	66.0%
STL → OAKOakland, CA	69.9%
STL → BURBurbank, CA	71.5%
STL → EWRNewark, NJ	71.8%
STL → SJUSan Juan, PR	73.7%

Most Punctual Routes

Destination	On-Time
STL → INDIndianapolis, IN	97.0%
STL → IADWashington, DC	91.7%
STL → SLCSalt Lake City, UT	88.8%
STL → CVGCincinnati, OH	86.9%
STL → ATLAtlanta, GA	85.9%

Was your flight from St. Louis, MO delayed?

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Data source: Bureau of Transportation Statistics (BTS) On-Time Performance dataset. Statistics are based on reported flight data from 2019 through November 2025 and are not real-time. See our data methodology for details.