Carrier route record
MQBOS→ORD
Envoy Air · Boston to Chicago
- Flights
- 441
- 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 BOS to ORD sits in the middle of the pack with a B−. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 441 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,791 at 74.5% on time.
The US average over the same twelve months is 77.3%, so there is little to separate Envoy on BOS to ORD from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.7%
Arrivals under 15 minutes late, of 424 completed flights
Avg delay
112 min
Across delayed arrivals only, not all flights
Cancelled
3.40%
National rate is 1.89%
Whole route
71.9%
Every carrier on BOS to ORD, 7,860 flights
These figures cover 441 flights between September 2025 and August 2026. Beyond the headline rate, 13.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Envoy against every carrier on BOS to ORD
Envoy flew 441 of the 7,860 flights on BOS to ORD, about 6% of it. Its 75.7% on time is 4 points better than the route as a whole, which runs 71.9%. Ranked by on-time rate it is first of six carriers on the route, where the range runs from Envoy at 75.7% to Delta at 63.7%.
The choice of carrier is not cosmetic here. United Airlines arrives on time 74.5% of the time; Delta Air Lines manages 63.7%. Sample sizes sit next to every figure, because a two-point gap across 981 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Air (this page) | 441 | 75.7% | 112 min | 3.40% | B− |
| United Airlines | 2,791 | 74.5% | 86 min | 1.79% | C |
| American Airlines | 2,165 | 73.3% | 98 min | 2.86% | C |
| Republic Airways | 930 | 71.2% | 82 min | 5.91% | C− |
| JetBlue Airways | 552 | 66.6% | 80 min | 3.26% | C− |
| Delta Air Lines | 981 | 63.7% | 75 min | 3.47% | 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.
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 Envoy 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 441 flights.
- 5am–8am—
- 8am–11am41 flights73.7%
- 11am–2pm61 flights79.7%
- 2pm–5pm320 flights77.3%
- 5pm–8pm19 flights—
- 8pm–5am—
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 79.7% on time, ahead of 8am–11am at 73.7%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 2pm–5pm window is the busiest, with 320 flights scheduled in it.
Across the year
Envoy on BOS to ORD through the year
August is the worst month at 54.8% on time, 34 points below February, the best at 88.7%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. February was the busiest month here, with 64 flights.
Across the week, Monday is the strongest day at 84.5% on time and Friday the weakest at 70.0%, a spread of 15 points.
Arrival by arrival
How late Envoy on BOS to ORD runs when it is late
Envoy on BOS to ORD often beats the schedule: 174 of 424 completed flights, 41%, arrived 15 minutes or more early. When Envoy on BOS to ORD is late it tends to be very late: 56 of its 103 late arrivals were an hour or more behind, and 32 were two hours or more.
- 15+ min early174 flights41.0%
- Within 15 min147 flights34.7%
- 15–29 min late20 flights4.7%
- 30–59 min late27 flights6.4%
- 1–2 hours late24 flights5.7%
- 2+ hours late32 flights7.5%
Scale runs 0% to 100%.
Share of 424 completed flights by arrival against schedule.
21 of 107 late departures made up the time and arrived on time, 20% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for Envoy on BOS to ORD
The latest arrival of the period was on 27 July 2026, 18 hours 16 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 July 2026 | 18 hours 16 minutes | Carrier |
| 31 August 2026 | 6 hours 17 minutes | National Airspace System |
| 13 June 2026 | 5 hours 41 minutes | Late-arriving aircraft |
| 19 August 2026 | 5 hours 32 minutes | Late-arriving aircraft |
| 17 October 2025 | 5 hours 24 minutes | Late-arriving aircraft |
Delay causes
Why Envoy runs late on this route
Late-arriving aircraft accounts for 50% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Late-arriving aircraft
- 29%National Airspace System
- 16%Carrier
- 5%Extreme weather
50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 11,000 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 11,493 reported delay minutes.
Cancellations run at 3.40%, against 1.89% nationally. That is about one flight in 30 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
13.2% 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 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 82.7% on time across 440 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 441 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 BOS to ORD
Put together: the delay figures matter less here than the 3.40% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 424 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to ORD, every carrier
- Envoy on ORD to BOS, the return leg
- United Airlines on BOS to ORD74.5%
- American Airlines on BOS to ORD73.3%
- Republic Airways on BOS to ORD71.2%
- JetBlue Airways on BOS to ORD66.6%
- Delta Air Lines on BOS to ORD63.7%
- Envoy Air network-wide record
- Boston Logan International (BOS) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.