Carrier route record
B6BOS→ORD
JetBlue Airways · Boston to Chicago
- Flights
- 552
- Period
- September 2025 to August 2026
- Share of route
- 7%
- Carriers
- 6
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on BOS to ORD draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 552 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 441 at 75.7% on time.
Envoy Air is the most reliable of the five carriers covered here at 75.7% on time across 441 flights.
Key figures
On time
66.6%
Arrivals under 15 minutes late, of 533 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
3.26%
National rate is 1.89%
Whole route
71.9%
Every carrier on BOS to ORD, 7,860 flights
These figures cover 552 flights between September 2025 and August 2026. Beyond the headline rate, 15.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
JetBlue against every carrier on BOS to ORD
JetBlue flew 552 of the 7,860 flights on BOS to ORD, about 7% of it. Its 66.6% on time is 5 points worse than the route as a whole, which runs 71.9%. Ranked by on-time rate it is number five 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. Envoy Air arrives on time 75.7% 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 | 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 (this page) | 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.
Flight by flight
JetBlue flight numbers on BOS to ORD
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 JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 40 points, against 12 points between the best and worst carrier.
- 5am–8am137 flights83.5%
- 8am–11am138 flights73.3%
- 11am–2pm14 flights—
- 2pm–5pm123 flights62.7%
- 5pm–8pm140 flights43.6%
- 8pm–5am—
Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 43.6% on time, against 83.5% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 140 flights scheduled in it.
Across the year
JetBlue on BOS to ORD through the year
August is the worst month at 46.3% on time, 31 points below October, the best at 77.2%. 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. July was the busiest month here, with 58 flights.
Across the week, Saturday is the strongest day at 75.5% on time and Friday the weakest at 56.8%, a spread of 19 points.
Arrival by arrival
How late JetBlue on BOS to ORD runs when it is late
JetBlue on BOS to ORD often beats the schedule: 157 of 533 completed flights, 29%, arrived 15 minutes or more early. The 178 late arrivals split 42 under half an hour, 54 between 30 and 60 minutes, and 82 an hour or more.
- 15+ min early157 flights29.5%
- Within 15 min198 flights37.1%
- 15–29 min late42 flights7.9%
- 30–59 min late54 flights10.1%
- 1–2 hours late46 flights8.6%
- 2+ hours late36 flights6.8%
Scale runs 0% to 100%.
Share of 533 completed flights by arrival against schedule.
24 of 162 late departures made up the time and arrived on time, 15% of them. In the other direction, 40 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 ORD.
The worst days
Worst days for JetBlue on BOS to ORD
The latest arrival of the period was on 21 July 2026, 6 hours 22 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 July 2026 | 6 hours 22 minutes | National Airspace System |
| 14 December 2025 | 5 hours 32 minutes | Carrier |
| 13 September 2025 | 5 hours 20 minutes | National Airspace System |
| 31 August 2026 | 5 hours 13 minutes | National Airspace System |
| 7 February 2026 | 4 hours 54 minutes | Extreme weather |
Delay causes
Why JetBlue runs late on this route
National Airspace System accounts for 47% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 47%National Airspace System
- 27%Late-arriving aircraft
- 23%Carrier
- 3%Extreme weather
47% 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 6,617 minutes out of 14,000, against a national NAS share of 21%. The split is drawn from 14,184 reported delay minutes.
Cancellations run at 3.26%, 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
15.4% 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 runs 68.1% on time across 553 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 552 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 JetBlue on BOS to ORD
Put together: the delay figures matter less here than the 3.26% cancellation rate. A late arrival costs you a little over 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. 533 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to ORD, every carrier
- JetBlue on ORD to BOS, the return leg
- Envoy Air on BOS to ORD75.7%
- United Airlines on BOS to ORD74.5%
- American Airlines on BOS to ORD73.3%
- Republic Airways on BOS to ORD71.2%
- Delta Air Lines on BOS to ORD63.7%
- JetBlue Airways network-wide record
- Boston Logan International (BOS) delay statistics
- Chicago O'Hare International (ORD) 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.