PlainFlights

Route · MKE → STL · 2020–2025 BTS data

Milwaukee to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MKE to STL (Milwaukee to St. Louis) ranks #3084 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

86.1%
On-time
+7.1 pts
vs US avg
57 min
Delay when late
3,567
Flights
#3084 of 4927
Corpus placement

Cancelled

0.6%

Best Month

Aug 2024 97%

Worst Month

Mar 2024 72%

Distance

317 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 58 10 0 0 WN
Nov 2025 54 4 1 0 WN
Oct 2025 57 2 0 0 WN
Sep 2025 60 3 0 0 WN
Aug 2025 60 6 0 1 WN
Jul 2025 57 8 0 0 WN
Jun 2025 55 7 0 0 WN
May 2025 53 3 0 0 WN
Apr 2025 52 6 0 0 WN
Mar 2025 54 8 0 0 WN
Feb 2025 54 2 0 0 WN
Jan 2025 58 7 2 0 WN
Dec 2024 58 13 0 0 WN
Nov 2024 54 8 0 0 WN
Oct 2024 58 4 0 0 WN
Sep 2024 60 4 0 0 WN
Aug 2024 61 2 0 0 WN
Jul 2024 57 8 0 1 WN
Jun 2024 54 13 0 0 WN
May 2024 54 13 0 0 WN
Apr 2024 52 12 0 0 WN
Mar 2024 53 15 0 0 WN
Feb 2024 54 4 0 0 WN
Jan 2024 59 11 5 0 WN

MKE–STL seasonal on-time pattern

Best: September (91.4%) · weakest: July (78.5%)

75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 84.6%

Strongest calendar month

September

91.4% on-time · ~56 flights/mo

Busiest calendar month

October

~57 flights/mo avg

Weakest calendar month

July

78.5% on-time · ~48 flights/mo

Cancellation Rate

0.6%

8 of 1,346 flights

Diversion Rate

0.1%

2 of 1,346 flights

Explore origin & destination

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

MKE - Milwaukee

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

MKE on-time profile

STL - St. Louis

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

STL on-time profile

Compare the two airports

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

Compare MKE vs STL

Origin-hub reliability standing

Among MKE's stronger departures

MKE → STL posts a 86.1% on-time rate, landing in the ≥85% band with 9 of 27 BTS-tracked routes leaving Milwaukee. The same hub also shows 18 mid-band and 0 challenged departures · fleet-wide on-time rank #878 of 4927 (highest on-time = #1).

What the Data Says About MKE to STL

Milwaukee to St. Louis (MKE to STL) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.1% on-time rate across 3,567 flights, with delays that do happen averaging 57.4 minutes. The corridor runs roughly 317 miles and is served by 1 carrier. Over the most recent 24 months, 8 of 1,346 flights were cancelled (0.6%) and 2 diverted (0.1%).

The monthly split is wide on this route: Aug 2024 posted the strongest performance at 97% on-time, while Mar 2024 came in at just 72% - a 25-point swing worth factoring into travel timing.

On the multi-year calendar, MKE–STL peaks in September at 91.4% on-time while October carries the heaviest traffic (~57 flights per month) ; the softest month is July at 78.5%, a 12.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does MKE to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, MKE to STL ranks #3084 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 MKE to STL? ▼
Flights from Milwaukee to St. Louis have a 86.1% on-time rate based on 3,567 flights. The average delay is 57.4 minutes. The best recent month was Aug 2024 with 97% on-time.
What is the cancellation rate for MKE to STL? ▼
Over the last 24 months, 0.6% of flights on this route were cancelled (8 of 1,346 flights) and 0.1% were diverted.
How far is the flight from MKE to STL? ▼
The flight distance from Milwaukee (MKE) to St. Louis (STL) is approximately 317 miles. This route is served by 1 carrier.
When is the best time to fly from MKE to STL? ▼
The best recent month for on-time performance was Aug 2024 (97% on-time). The worst was Mar 2024 (72% on-time). Consider booking during months with historically better performance.

Airports on this route

MKE Airport

Milwaukee
STL Airport

St. Louis
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 MKE–STL data

MKE–STL runs 7.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare MKE and STL airport profiles: delay causes and top routes differ even on the same corridor. MKE airport
  • If your dates flex, September (91.4% on-time) beats July (78.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 86.1% 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.