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Route · BOS → MKE · 2020–2025 BTS data

Boston to Milwaukee

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to MKE (Boston to Milwaukee) ranks #2981 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.7%
On-time
+3.7 pts
vs US avg
75 min
Delay when late
3,794
Flights
#2981 of 4927
Corpus placement

Cancelled

1.4%

Best Month

Feb 2024 96%

Worst Month

Jul 2025 68%

Distance

860 mi

Carriers

18

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 33 11 1 0 DL,YX
Nov 2025 54 10 7 0 YX
Oct 2025 82 16 2 0 B6,YX
Sep 2025 78 24 1 0 YX,B6
Aug 2025 87 14 1 0 YX,B6
Jul 2025 85 27 3 0 B6,YX
Jun 2025 84 14 0 0 B6,YX
May 2025 87 23 1 0 B6,YX
Apr 2025 55 6 0 0 YX,B6
Mar 2025 51 4 0 0 YX
Jan 2025 31 1 1 1 YX
Dec 2024 47 4 0 0 YX
Nov 2024 46 7 0 0 YX
Oct 2024 79 9 0 0 YX,B6
Sep 2024 74 6 0 0 YX,B6
Aug 2024 88 11 2 1 B6,YX
Jul 2024 84 14 2 0 B6,DL,YX
Jun 2024 84 14 1 0 B6,DL,YX
May 2024 87 16 0 1 B6,YX
Apr 2024 86 15 0 0 B6,YX
Mar 2024 88 9 0 0 B6,YX
Feb 2024 57 2 0 0 B6,YX
Jan 2024 34 5 2 1 B6,YX
Dec 2023 75 5 0 0 OO,B6,YX

BOS–MKE seasonal on-time pattern

Best: October (87.8%) · weakest: July (77.7%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 83.8%

Strongest calendar month

October

87.8% on-time · ~79 flights/mo

Busiest calendar month

May

~94 flights/mo avg

Weakest calendar month

July

77.7% on-time · ~90 flights/mo

Cancellation Rate

1.4%

24 of 1,656 flights

Diversion Rate

0.2%

4 of 1,656 flights

Explore origin & destination

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

BOS - Boston

Full on-time, delay-cause, and seasonal performance for Boston, MA.

BOS 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 BOS and MKE side by side on delays, cancellations, and reliability.

Compare BOS vs MKE

Origin-hub reliability standing

Mid-pack among BOS departures

From BOS, this corridor sits with 49 other 75–85% on-time routes out of 60 tracked departures, not the hub's reliability leaders (6 at ≥85%) and not the softest ( 5 below 75%). Destination: Milwaukee · fleet on-time rank #2056 of 4927.

What the Data Says About BOS to MKE

Bureau of Transportation Statistics records show Boston to Milwaukee (BOS to MKE) running a 82.7% on-time rate over 3,794 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 75.0 minutes. The 860-mile corridor is served by 18 carriers, and over the last 24 months 1.4% of 1,656 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 96% on-time, while Jul 2025 came in at just 68% - a 28-point swing worth factoring into travel timing.

On the multi-year calendar, BOS–MKE peaks in October at 87.8% on-time while May carries the heaviest traffic (~94 flights per month) ; the softest month is July at 77.7%, 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 BOS to MKE rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BOS to MKE ranks #2981 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 BOS to MKE? ▼
Flights from Boston to Milwaukee have a 82.7% on-time rate based on 3,794 flights. The average delay is 75.0 minutes. The best recent month was Feb 2024 with 96% on-time.
What is the cancellation rate for BOS to MKE? ▼
Over the last 24 months, 1.4% of flights on this route were cancelled (24 of 1,656 flights) and 0.2% were diverted.
How far is the flight from BOS to MKE? ▼
The flight distance from Boston (BOS) to Milwaukee (MKE) is approximately 860 miles. This route is served by 18 carriers.
When is the best time to fly from BOS to MKE? ▼
The best recent month for on-time performance was Feb 2024 (96% on-time). The worst was Jul 2025 (68% on-time). Consider booking during months with historically better performance.

Airports on this route

BOS Airport

Boston
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 BOS–MKE data

BOS–MKE runs 3.7 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare BOS and MKE airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
  • If your dates flex, October (87.8% on-time) beats July (77.7%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.7% 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.