Carrier route record
MQORD→BOS
Envoy Air · Chicago to Boston
- Flights
- 440
- Period
- September 2025 to August 2026
- Share of route
- 6%
- Carriers
- 6
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Envoy Air.
Envoy on ORD to BOS lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 440 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 932 at 69.7% on time.
Set against the rest of the country, Envoy's ORD to BOS record is 5 points better than the US average of 77.3%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.
Key figures
On time
82.7%
Arrivals under 15 minutes late, of 427 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
2.50%
National rate is 1.89%
Whole route
66.6%
Every carrier on ORD to BOS, 7,864 flights
These figures cover 440 flights between September 2025 and August 2026. The median arrival is 11 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
Envoy against every carrier on ORD to BOS
Envoy flew 440 of the 7,864 flights on ORD to BOS, about 6% of it. Its 82.7% on time is 16 points better than the route as a whole, which runs 66.6%. Ranked by on-time rate it is first of six carriers on the route, where the range runs from Envoy at 82.7% to American at 59.5%.
The choice of carrier is not cosmetic here. Republic Airways arrives on time 69.7% of the time; American Airlines manages 59.5%. Sample sizes sit next to every figure, because a two-point gap across 2,164 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Air (this page) | 440 | 82.7% | 67 min | 2.50% | B |
| Republic Airways | 932 | 69.7% | 79 min | 5.90% | C− |
| JetBlue Airways | 553 | 68.1% | 98 min | 3.98% | C− |
| United Airlines | 2,794 | 68.0% | 80 min | 1.79% | C |
| Delta Air Lines | 981 | 67.4% | 90 min | 3.47% | C− |
| American Airlines | 2,164 | 59.5% | 78 min | 2.91% | D |
Republic Airways cancels 5.9% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
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Departure window
When Envoy runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 10 points between the best and worst carrier.
- 5am–8am134 flights85.7%
- 8am–11am171 flights87.1%
- 11am–2pm67 flights76.9%
- 2pm–5pm60 flights69.0%
- 5pm–8pm8 flights—
- 8pm–5am—
Scale runs 60% 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 69.0% for the afternoon window. That is 18 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 171 flights scheduled in it.
Across the year
Envoy on ORD to BOS through the year
Delays peak in March, when the on-time rate falls to 73.3%. June is the strongest month at 96.7%. Moving a flexible trip across that boundary buys 23 points. February was the busiest month here, with 64 flights.
Across the week, Thursday is the strongest day at 89.7% on time and Friday the weakest at 75.0%, a spread of 15 points.
Arrival by arrival
How late Envoy on ORD to BOS runs when it is late
Envoy on ORD to BOS often beats the schedule: 185 of 427 completed flights, 43%, arrived 15 minutes or more early. The 74 late arrivals split 27 under half an hour, 20 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early185 flights43.3%
- Within 15 min168 flights39.3%
- 15–29 min late27 flights6.3%
- 30–59 min late20 flights4.7%
- 1–2 hours late14 flights3.3%
- 2+ hours late13 flights3.0%
Scale runs 0% to 100%.
Share of 427 completed flights by arrival against schedule.
15 of 61 late departures made up the time and arrived on time, 25% 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 Envoy on ORD to BOS
The latest arrival of the period was on 30 November 2025, 6 hours 30 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across November, October, February and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 6 hours 30 minutes | Extreme weather |
| 14 October 2025 | 3 hours 31 minutes | Extreme weather |
| 7 February 2026 | 3 hours 11 minutes | National Airspace System |
| 31 March 2026 | 3 hours 9 minutes | Late-arriving aircraft |
| 21 February 2026 | 3 hours 4 minutes | Carrier |
Delay causes
Why Envoy 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 4,980 reported delay minutes.
- 37%National Airspace System
- 25%Late-arriving aircraft
- 23%Extreme weather
- 15%Carrier
Extreme weather accounts for 23% 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 3.8 times the usual weather exposure. The split is drawn from 4,980 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 1,846 minutes out of 4,980, against a national NAS share of 21%.
Cancellations run at 2.50%, against 1.89% nationally. That is about one flight in 40 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
6.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 867 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 75.7% on time across 441 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 440 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 Envoy on ORD to BOS
Put together: treat all of this as provisional. 440 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 82.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 427 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to BOS, every carrier
- Envoy on BOS to ORD, the return leg
- Republic Airways on ORD to BOS69.7%
- JetBlue Airways on ORD to BOS68.1%
- United Airlines on ORD to BOS68.0%
- Delta Air Lines on ORD to BOS67.4%
- American Airlines on ORD to BOS59.5%
- Envoy Air network-wide record
- Chicago O'Hare International (ORD) delay statistics
- Boston Logan International (BOS) delay statistics
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
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.