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DelayAtlas

Carrier route record

B6MKE→BOS

JetBlue Airways · Milwaukee to Boston

Flights
172
Period
September 2025 to August 2026
Share of route
23%
Carriers
3
CGRADE

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.

JetBlue on MKE to BOS sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 172 flights, with a median arrival 10 minutes early.

The national on-time rate over the same period is 77.3%, so JetBlue on MKE to BOS runs 6 points behind the country as a whole. Across a thousand flights that is about 55 extra late arrivals.

Key figures

On time

71.8%

Arrivals under 15 minutes late, of 170 completed flights

Avg delay

55 min

Across delayed arrivals only, not all flights

Cancelled

1.16%

National rate is 1.89%

Whole route

72.1%

Every carrier on MKE to BOS, 736 flights

These figures cover 172 flights between September 2025 and August 2026. Beyond the headline rate, 10.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Carrier by carrier

JetBlue against every carrier on MKE to BOS

JetBlue flew 172 of the 736 flights on MKE to BOS, about 23% of it. Its 71.8% on time is about level with the route as a whole at 72.1%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Republic at 72.7% to Delta at 60.9%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on MKE to BOS
AirlineFlightsOn timeAvg delayCancelledGrade
Republic Airways54072.7%65 min4.07%C−
JetBlue Airways (this page)thin sample17271.8%55 min1.16%C
Delta Air Linesthin sample2460.9%58 min4.17%D−

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Departure window

When JetBlue runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 45 points, against half a point between the best and worst carrier.

  • 5am–8am—
  • 8am–11am103 flights87.1%
  • 11am–2pm—
  • 2pm–5pm52 flights42.3%
  • 5pm–8pm17 flights—
  • 8pm–5am—

Scale runs 35% to 95%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 87.1% of the time, against 42.3% for the afternoon window. That is 45 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 103 flights scheduled in it.

Across the year

JetBlue on MKE to BOS through the year

  • Jul–Sep 202522 flights—
  • Oct–Dec 202525 flights—
  • Apr–Jun 202663 flights79.4%
  • Jul–Sep 202662 flights83.3%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 71.8% on time across 172 flights.

Split by quarter, JetBlue on MKE to BOS logged 22 flights in Jul–Sep 2025, 25 flights in Oct–Dec 2025, 63 flights in Apr–Jun 2026 and 62 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 71.8% annual figure is the one to use.

Arrival by arrival

How late JetBlue on MKE to BOS runs when it is late

JetBlue on MKE to BOS often beats the schedule: 63 of 170 completed flights, 37%, arrived 15 minutes or more early. The 48 late arrivals split 14 under half an hour, 17 between 30 and 60 minutes, and 17 an hour or more.

  • 15+ min early63 flights37.1%
  • Within 15 min59 flights34.7%
  • 15–29 min late14 flights8.2%
  • 30–59 min late17 flights10.0%
  • 1–2 hours late15 flights8.8%
  • 2+ hours late2 flights1.2%

Scale runs 0% to 100%.

Share of 170 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 40 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 11 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BOS.

The worst days

Worst days for JetBlue on MKE to BOS

The latest arrival of the period was on 13 October 2025, 4 hours 32 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Four of the five worst days fell in October 2025.

The latest arrivals of JetBlue on MKE to BOS in the period
DateArrived late byLargest filed cause
13 October 20254 hours 32 minutesNational Airspace System
13 June 20262 hours 27 minutesLate-arriving aircraft
12 October 20251 hour 58 minutesNational Airspace System
8 October 20251 hour 42 minutesNational Airspace System
14 October 20251 hour 33 minutesNational Airspace System

Delay causes

Why JetBlue runs late on this route

National Airspace System accounts for 67% of the 2,655 delay minutes carriers reported here, and the remaining four split what is left.

  • National Airspace System
    67%
  • Late-arriving aircraft
    30%
  • Carrier
    4%

67% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,770 minutes out of 2,655, against a national NAS share of 21%. The split is drawn from 2,655 reported delay minutes.

The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.1% on time here.

Cancellations sit at 1.16% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

10.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

The 860 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.

The return leg is a different operation and performs like one: it runs 87.6% on time across 172 flights, 16 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 16 points of difference.

One caution: this is a thin sample. 172 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking JetBlue on MKE to BOS

Put together: treat all of this as provisional. 172 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 71.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 170 completed flights over 12 months sit behind that.

Related

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.