Carrier route record
B6BOS→MKE
JetBlue Airways · Boston to Milwaukee
- Flights
- 172
- Period
- September 2025 to August 2026
- Share of route
- 23%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on BOS to MKE earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 172 flights, with a median arrival 9 minutes early.
Set against the rest of the country, JetBlue's BOS to MKE record is 10 points better than the US average of 77.3%. That gap is worth roughly 103 fewer late arrivals for every thousand flights.
Key figures
On time
87.6%
Arrivals under 15 minutes late, of 170 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.16%
National rate is 1.89%
Whole route
82.7%
Every carrier on BOS to MKE, 737 flights
These figures cover 172 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
JetBlue against every carrier on BOS to MKE
JetBlue flew 172 of the 737 flights on BOS to MKE, about 23% of it. Its 87.6% on time is 5 points better than the route as a whole, which runs 82.7%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from JetBlue at 87.6% to Delta at 58.3%. 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 |
|---|---|---|---|---|---|
| JetBlue Airways (this page)thin sample | 172 | 87.6% | 58 min | 1.16% | A |
| Republic Airways | 540 | 82.2% | 54 min | 4.26% | B− |
| Delta Air Linesthin sample | 25 | 58.3% | 92 min | 4.00% | 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 is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 172 flights.
- 5am–8am103 flights90.1%
- 8am–11am—
- 11am–2pm3 flights—
- 2pm–5pm66 flights83.3%
- 5pm–8pm—
- 8pm–5am—
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 90.1% on time for the 5am–8am window against 83.3% for 2pm–5pm. Worth taking if the schedule allows, not worth an extra connection. The 5am–8am window is the busiest, with 103 flights scheduled in it.
Across the year
JetBlue on BOS to MKE through the year
- Jul–Sep 202522 flights—
- Oct–Dec 202525 flights—
- Apr–Jun 202663 flights85.7%
- Jul–Sep 202662 flights88.3%
Scale runs 75% to 95%. 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 87.6% on time across 172 flights.
Split by quarter, JetBlue on BOS to MKE 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 87.6% annual figure is the one to use.
Arrival by arrival
How late JetBlue on BOS to MKE runs when it is late
JetBlue on BOS to MKE often beats the schedule: 52 of 170 completed flights, 31%, arrived 15 minutes or more early. The 21 late arrivals split 6 under half an hour, 7 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early52 flights30.6%
- Within 15 min97 flights57.1%
- 15–29 min late6 flights3.5%
- 30–59 min late7 flights4.1%
- 1–2 hours late7 flights4.1%
- 2+ hours late1 flights0.6%
Scale runs 0% to 100%.
Share of 170 completed flights by arrival against schedule.
5 of 25 late departures made up the time and arrived on time, 20% of them. Only 1 left on time and still arrived late.
The worst days
Worst days for JetBlue on BOS to MKE
The latest arrival of the period was on 13 June 2026, 2 hours 46 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 June 2026 | 2 hours 46 minutes | Late-arriving aircraft |
| 7 May 2026 | 1 hour 45 minutes | Late-arriving aircraft |
| 13 October 2025 | 1 hour 42 minutes | Late-arriving aircraft |
| 15 August 2026 | 1 hour 40 minutes | Carrier |
| 28 August 2026 | 1 hour 16 minutes | Carrier |
Delay causes
Why JetBlue runs late on this route
Late-arriving aircraft accounts for 48% of the 1,208 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 42%Carrier
- 10%National Airspace System
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,208 reported delay minutes here, that single category outweighs weather by 48 to one. The split is drawn from 1,208 reported delay minutes.
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 506 of the 1,208 delay minutes reported 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
Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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 71.8% on time across 172 flights, 16 points below 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 BOS to MKE
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 87.6% 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
- BOS to MKE, every carrier
- JetBlue on MKE to BOS, the return leg
- Republic Airways on BOS to MKE82.2%
- JetBlue Airways network-wide record
- Boston Logan International (BOS) delay statistics
- Milwaukee Mitchell International (MKE) delay statistics
- Why the first flight of the morning is statistically safest
- How to read this site: grades, sample sizes, and honest caveats
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.