Carrier route record

MQORD→BOS

Envoy Air · Chicago to Boston

Flights: 444
Period: July 2025 to June 2026
Share of route: 6%
Carriers: 6

Historical statistics for July 2025 to June 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 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 444 flights. The strongest carrier on the route with a full sample, JetBlue Airways, flew 534 at 73.5% on time.

Set against the rest of the country, Envoy's ORD to BOS record is 5 points better than the US average of 77.6%. That gap is worth roughly 52 fewer late arrivals for every thousand flights.

On time

82.8%

Arrivals under 15 minutes late, of 431 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

2.48%

National rate is 1.81%

Whole route

67.6%

Every carrier on ORD to BOS, 7,642 flights

These figures cover 444 flights between July 2025 and June 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.

Carrier by carrier

Envoy against every carrier on ORD to BOS

Envoy flew 444 of the 7,642 flights on ORD to BOS, about 6% of it. Its 82.8% on time is 15 points better than the route as a whole, which runs 67.6%. Ranked by on-time rate it is first of six carriers on the route, where the range runs from Envoy at 82.8% to American at 59.9%.

The choice of carrier is not cosmetic here. JetBlue Airways arrives on time 73.5% of the time; American Airlines manages 59.9%. Sample sizes sit next to every figure, because a two-point gap across 2,126 flights means less than a ten-point one.

On-time performance by carrier on ORD to BOS
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Air (this page)	444	82.8%	69 min	2.48%	B
JetBlue Airways	534	73.5%	83 min	2.62%	C
Republic Airways	896	70.3%	73 min	5.47%	C−
Delta Air Lines	962	69.1%	88 min	3.01%	C−
United Airlines	2,680	68.6%	78 min	1.87%	C
American Airlines	2,126	59.9%	75 min	2.82%	D

Republic Airways cancels 5.5% 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.

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 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am196 flights86.7%
8am–11am113 flights86.6%
11am–2pm67 flights76.9%
2pm–5pm60 flights69.0%
5pm–8pm8 flights—
8pm–5am—

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 86.7% 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 5am–8am window is the busiest, with 196 flights scheduled in it.

Across the year

Envoy on ORD to BOS through the year

Darker means more delays. Figures are on-time percentages.June best, March worst

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 71.7%. 18 points is a smaller lever than departure hour, but it is free.

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 5,101 reported delay minutes.

National Airspace System
36%
Late-arriving aircraft
28%
Extreme weather
22%
Carrier
14%

Extreme weather accounts for 22% 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 3.5 times the usual weather exposure. The split is drawn from 5,101 reported delay minutes.

36% 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 1,813 minutes out of 5,101, against a national NAS share of 21%.

Cancellations sit at 2.48% against a national 1.81%, which is ordinary. Diversions add another 0.45%.

Connections and stage length

What a delay here costs

6.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over 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. 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 75.6% on time across 445 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. 444 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. 444 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 82.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 431 completed flights over 12 months sit behind that.

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.

Key figures