Carrier route record
YXMKE→BOS
Republic Airways · Milwaukee to Boston
- Flights
- 549
- Period
- July 2025 to June 2026
- Share of route
- 74%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on MKE to BOS sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 549 flights, with a median arrival 9 minutes early.
The national on-time rate over the same period is 77.6%, so Republic on MKE to BOS runs 5 points behind the country as a whole. Across a thousand flights that is about 45 extra late arrivals.
Key figures
On time
73.1%
Arrivals under 15 minutes late, of 527 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
4.01%
National rate is 1.81%
Whole route
69.8%
Every carrier on MKE to BOS, 741 flights
These figures cover 549 flights between July 2025 and June 2026. Beyond the headline rate, 11.4% 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
Republic against every carrier on MKE to BOS
Republic flew 549 of the 741 flights on MKE to BOS, most of the route. Its 73.1% on time is 3 points better than the route as a whole, which runs 69.8%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 73.1% to JetBlue at 60.6%. Two 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 (this page) | 549 | 73.1% | 66 min | 4.01% | C− |
| Delta Air Linesthin sample | 20 | 63.2% | 64 min | 5.00% | D− |
| JetBlue Airwaysthin sample | 172 | 60.6% | 67 min | 0.58% | D+ |
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 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–8am58 flights79.2%
- 8am–11am5 flights—
- 11am–2pm242 flights68.6%
- 2pm–5pm20 flights—
- 5pm–8pm111 flights81.7%
- 8pm–5am113 flights70.6%
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 68.6% on time against 81.7% for 5pm–8pm. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 11am–2pm window is the busiest, with 242 flights scheduled in it.
Across the year
Republic on MKE to BOS through the year
Delays peak in September, when the on-time rate falls to 45.5%. March is the strongest month at 97.8%. Moving a flexible trip across that boundary buys 52 points. October was the busiest month here, with 57 flights.
Across the week, Saturday is the strongest day at 78.3% on time and Thursday the weakest at 68.8%. 10 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 9,414 reported delay minutes.
- 34%National Airspace System
- 32%Carrier
- 28%Late-arriving aircraft
- 7%Extreme weather
34% 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 3,198 minutes out of 9,414, against a national NAS share of 21%. The split is drawn from 9,414 reported delay minutes.
Cancellations run at 4.01%, against 1.81% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
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. 11.4% 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 80.8% on time across 549 flights, 8 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 8 points of difference.
One caution: this is a thin sample. 549 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 Republic on MKE to BOS
Put together: the delay figures matter less here than the 4.01% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5pm–8pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 527 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.