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Route · STL → MKE · 2020–2025 BTS data

St. Louis to Milwaukee

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to MKE (St. Louis to Milwaukee) ranks #3078 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.9%
On-time
+3.9 pts
vs US avg
62 min
Delay when late
3,592
Flights
#3078 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Sep 2024 93%

Worst Month

Jan 2024 68%

Distance

317 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 58 12 0 0 WN
Nov 2025 54 12 1 0 WN
Oct 2025 57 8 0 0 WN
Sep 2025 60 8 0 0 WN
Aug 2025 60 7 1 0 WN
Jul 2025 57 12 0 0 WN
Jun 2025 55 6 0 0 WN
May 2025 53 5 0 0 WN
Apr 2025 52 9 0 0 WN
Mar 2025 54 4 0 0 WN
Feb 2025 53 9 1 0 WN
Jan 2025 58 11 3 0 WN
Dec 2024 58 6 0 0 WN
Nov 2024 54 4 0 1 WN
Oct 2024 58 4 2 0 WN
Sep 2024 60 4 0 0 WN
Aug 2024 61 8 2 1 WN
Jul 2024 57 14 0 1 WN
Jun 2024 54 10 0 0 WN
May 2024 54 14 0 0 WN
Apr 2024 52 10 0 0 WN
Mar 2024 53 13 0 0 WN
Feb 2024 54 10 0 0 WN
Jan 2024 59 19 4 0 WN

STL–MKE seasonal on-time pattern

Best: October (87.2%) · weakest: July (77.1%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 80.7%

Strongest calendar month

October

87.2% on-time · ~57 flights/mo

Busiest calendar month

October

~57 flights/mo avg

Weakest calendar month

July

77.1% on-time · ~48 flights/mo

Cancellation Rate

1.0%

14 of 1,345 flights

Diversion Rate

0.2%

3 of 1,345 flights

Explore origin & destination

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

STL - St. Louis

Full on-time, delay-cause, and seasonal performance for St. Louis, MO.

STL on-time profile

MKE - Milwaukee

Full on-time, delay-cause, and seasonal performance for Milwaukee, WI.

MKE on-time profile

Compare the two airports

See STL and MKE side by side on delays, cancellations, and reliability.

Compare STL vs MKE

Origin-hub reliability standing

Mid-pack among STL departures

From STL, this corridor sits with 45 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (5 at ≥85%) and not the softest ( 1 below 75%). Destination: Milwaukee · fleet on-time rank #2013 of 4927.

What the Data Says About STL to MKE

Bureau of Transportation Statistics records show St. Louis to Milwaukee (STL to MKE) running a 82.9% on-time rate over 3,592 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 62.0 minutes. The 317-mile corridor is served by 1 carrier, and over the last 24 months 1.0% of 1,345 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Sep 2024 posted the strongest performance at 93% on-time, while Jan 2024 came in at just 68% - a 26-point swing worth factoring into travel timing.

On the multi-year calendar, STL–MKE peaks in October at 87.2% on-time ; the softest month is July at 77.1%, a 10.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does STL to MKE rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, STL to MKE ranks #3078 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 STL to MKE? ▼
Flights from St. Louis to Milwaukee have a 82.9% on-time rate based on 3,592 flights. The average delay is 62.0 minutes. The best recent month was Sep 2024 with 93% on-time.
What is the cancellation rate for STL to MKE? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (14 of 1,345 flights) and 0.2% were diverted.
How far is the flight from STL to MKE? ▼
The flight distance from St. Louis (STL) to Milwaukee (MKE) is approximately 317 miles. This route is served by 1 carrier.
When is the best time to fly from STL to MKE? ▼
The best recent month for on-time performance was Sep 2024 (93% on-time). The worst was Jan 2024 (68% on-time). Consider booking during months with historically better performance.

Airports on this route

STL Airport

St. Louis
MKE Airport

Milwaukee
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 STL–MKE data

STL–MKE runs 3.9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare STL and MKE airport profiles: delay causes and top routes differ even on the same corridor. STL airport
  • If your dates flex, October (87.2% on-time) beats July (77.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.9% 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.