Carrier route record
B6MKE→BOS
JetBlue Airways · Milwaukee to Boston
- Flights
- 172
- Period
- July 2025 to June 2026
- Share of route
- 23%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on MKE to BOS draws a D+. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 172 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.6%, so JetBlue on MKE to BOS runs 17 points behind the country as a whole. Across a thousand flights that is about 170 extra late arrivals.
Key figures
On time
60.6%
Arrivals under 15 minutes late, of 170 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.81%
Whole route
69.8%
Every carrier on MKE to BOS, 741 flights
These figures cover 172 flights between July 2025 and June 2026. Beyond the headline rate, 20.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
JetBlue against every carrier on MKE to BOS
JetBlue flew 172 of the 741 flights on MKE to BOS, about 23% of it. Its 60.6% on time is 9 points worse than the route as a whole, which runs 69.8%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Republic at 73.1% to JetBlue at 60.6%. 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways | 549 | 73.1% | 66 min | 4.01% | C− |
| Delta Air Linesthin sample | 20 | 63.2% | 64 min | 5.00% | D− |
| JetBlue Airways (this page)thin sample | 172 | 60.6% | 67 min | 0.58% | D+ |
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 46 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am41 flights92.7%
- 11am–2pm—
- 2pm–5pm109 flights46.7%
- 5pm–8pm22 flights—
- 8pm–5am—
Scale runs 40% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 92.7% of the time, against 46.7% for the afternoon window. That is 46 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 109 flights scheduled in it.
Across the year
JetBlue on MKE to BOS through the year
- Jul–Sep 202584 flights51.2%
- Oct–Dec 202525 flights—
- Apr–Jun 202663 flights79.4%
Scale runs 45% to 85%. 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 60.6% on time across 172 flights.
Split by quarter, JetBlue on MKE to BOS logged 84 flights in Jul–Sep 2025, 25 flights in Oct–Dec 2025 and 63 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 60.6% annual figure is the one to use.
Delay causes
Why JetBlue runs late on this route
One category carries most of the weight here. National Airspace System accounts for 63% of the 4,477 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 63%National Airspace System
- 28%Late-arriving aircraft
- 9%Carrier
63% 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 2,827 minutes out of 4,477, against a national NAS share of 21%. The split is drawn from 4,477 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 92.7% on time here.
Cancellations are rare at 0.58%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 20.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 83.0% on time across 172 flights, 22 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 22 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 60.6% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.