Carrier route record
YXMKE→BOS
Republic Airways · Milwaukee to Boston
- Flights
- 540
- Period
- September 2025 to August 2026
- Share of route
- 73%
- Carriers
- 3
Historical statistics for September 2025 to August 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−. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 540 flights, with a median arrival 9 minutes early.
The national on-time rate over the same period is 77.3%, so Republic on MKE to BOS runs 5 points behind the country as a whole. Across a thousand flights that is about 46 extra late arrivals.
Key figures
On time
72.7%
Arrivals under 15 minutes late, of 517 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
4.07%
National rate is 1.89%
Whole route
72.1%
Every carrier on MKE to BOS, 736 flights
These figures cover 540 flights between September 2025 and August 2026. Beyond the headline rate, 11.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Republic against every carrier on MKE to BOS
Republic flew 540 of the 736 flights on MKE to BOS, most of the route. Its 72.7% on time is about level with the route as a whole at 72.1%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 72.7% to Delta at 60.9%. 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) | 540 | 72.7% | 65 min | 4.07% | C− |
| JetBlue Airwaysthin sample | 172 | 71.8% | 55 min | 1.16% | C |
| Delta Air Linesthin sample | 24 | 60.9% | 58 min | 4.17% | 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 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 11 points, against half a point between the best and worst carrier.
- 5am–8am58 flights79.2%
- 8am–11am5 flights—
- 11am–2pm226 flights68.2%
- 2pm–5pm25 flights—
- 5pm–8pm155 flights77.8%
- 8pm–5am71 flights72.9%
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 68.2% on time against 79.2% for 5am–8am. 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 226 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, Friday is the strongest day at 75.3% on time and Monday the weakest at 68.7%, a spread of 7 points.
Arrival by arrival
How late Republic on MKE to BOS runs when it is late
Republic on MKE to BOS often beats the schedule: 207 of 517 completed flights, 40%, arrived 15 minutes or more early. The 141 late arrivals split 35 under half an hour, 49 between 30 and 60 minutes, and 57 an hour or more.
- 15+ min early207 flights40.0%
- Within 15 min169 flights32.7%
- 15–29 min late35 flights6.8%
- 30–59 min late49 flights9.5%
- 1–2 hours late41 flights7.9%
- 2+ hours late16 flights3.1%
Scale runs 0% to 100%.
Share of 517 completed flights by arrival against schedule.
16 of 129 late departures made up the time and arrived on time, 12% of them. In the other direction, 28 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 Republic on MKE to BOS
The latest arrival of the period was on 4 October 2025, 6 hours 27 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across October, February, August and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 October 2025 | 6 hours 27 minutes | Carrier |
| 14 February 2026 | 5 hours 54 minutes | Carrier |
| 31 August 2026 | 4 hours | Extreme weather |
| 6 July 2026 | 3 hours 23 minutes | Late-arriving aircraft |
| 13 October 2025 | 3 hours 3 minutes | National Airspace System |
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 9,105 reported delay minutes.
- 37%National Airspace System
- 25%Late-arriving aircraft
- 25%Carrier
- 13%Extreme weather
Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.2 times the usual weather exposure. The split is drawn from 9,105 reported delay minutes.
37% 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 3,356 minutes out of 9,105, against a national NAS share of 21%.
Cancellations run at 4.07%, against 1.89% 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
11.0% 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 82.2% on time across 540 flights, 10 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 10 points of difference.
One caution: this is a thin sample. 540 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 4.07% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 517 completed flights over 12 months sit behind that.
Related
Where to go next
- MKE to BOS, every carrier
- Republic on BOS to MKE, the return leg
- JetBlue Airways on MKE to BOS71.8%
- Republic Airways network-wide record
- Milwaukee Mitchell International (MKE) delay statistics
- Boston Logan International (BOS) delay statistics
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
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.