STL to MKE flight delays & on-time performance
Nonstop flights from St. Louis Lambert International Airport to General Mitchell International Airport · 317 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL or MKE 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 Milwaukee (MKE) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.7% were cancelled, and 5% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 8am did best (96% on time); around 9pm did worst (68%).
- Saturday was the most reliable day to fly (88% on time) and Monday the least (72%).
- The largest source of delay minutes was late-arriving aircraft (65%).
Which airline is most on time from STL to MKE?
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 |
|---|---|---|---|---|---|
| Southwest Airlines | 82% | 0.7% | 12 min | 4.6% | 685 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am96%118 flights
- 9am91%34 flights
- 10am89%152 flights
- 11am93%28 flights
- 1pm83%18 flights
- 7pm82%28 flights
- 8pm74%111 flights
- 9pm68%157 flights
- 10pm71%21 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday72%1.9% cancelled
- Tuesday87%0.0% cancelled
- Wednesday85%0.0% cancelled
- Thursday83%0.0% cancelled
- Friday84%0.0% cancelled
- Saturday88%2.6% cancelled
- Sunday80%1.1% 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 aircraft65%
- Airline (crew, maintenance, cleaning, fueling)27%
- Air traffic control & airport congestion6%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather80%
- Airline (crew, maintenance, cleaning, fueling)20%
- Air traffic control & airport congestion0%
- Security0%
STL to MKE: common questions
- How often are STL to MKE flights on time?
- 82% 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 Milwaukee cancelled?
- 0.7% of scheduled flights were cancelled (5 of 685).
- 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 62 min behind schedule on average, and 4.6% 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: MKE to STL — 89% 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 → MKE, nonstop flights by US airlines that report to the DOT. How we calculate this.