Carrier route record
B6IAH→BOS
JetBlue Airways · Houston to Boston
- Flights
- 468
- Period
- September 2025 to August 2026
- Share of route
- 23%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on IAH to BOS earns a D, which is as low as this site's scale goes for a reason. Only 55.9% of flights arrive inside the 15-minute window, 21 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 468 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so JetBlue on IAH to BOS runs 21 points behind the country as a whole. Across a thousand flights that is about 214 extra late arrivals.
Key figures
On time
55.9%
Arrivals under 15 minutes late, of 454 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
2.78%
National rate is 1.89%
Whole route
71.5%
Every carrier on IAH to BOS, 2,017 flights
These figures cover 468 flights between September 2025 and August 2026. Beyond the headline rate, 23.1% 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 IAH to BOS
JetBlue flew 468 of the 2,017 flights on IAH to BOS, about 23% of it. Its 55.9% on time is 16 points worse than the route as a whole, which runs 71.5%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 76.1% to JetBlue at 55.9%.
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 |
|---|---|---|---|---|---|
| United Airlines | 1,549 | 76.1% | 72 min | 1.10% | B |
| JetBlue Airways (this page) | 468 | 55.9% | 88 min | 2.78% | D |
Flight by flight
JetBlue flight numbers on IAH to BOS
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 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 468 flights.
- 5am–8am—
- 8am–11am11 flights—
- 11am–2pm215 flights60.0%
- 2pm–5pm104 flights52.0%
- 5pm–8pm135 flights50.8%
- 8pm–5am3 flights—
Scale runs 40% to 65%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 50.8% on time, against 60.0% for the 11am–2pm 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 11am–2pm window is the busiest, with 215 flights scheduled in it.
Across the year
JetBlue on IAH to BOS through the year
July is the worst month at 24.1% on time, 54 points below December, the best at 78.6%. 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 62 flights.
Across the week, Wednesday is the strongest day at 63.9% on time and Sunday the weakest at 50.7%, a spread of 13 points.
Arrival by arrival
How late JetBlue on IAH to BOS runs when it is late
When JetBlue on IAH to BOS is late it tends to be very late: 105 of its 200 late arrivals were an hour or more behind, and 35 were two hours or more.
- 15+ min early76 flights16.7%
- Within 15 min178 flights39.2%
- 15–29 min late43 flights9.5%
- 30–59 min late52 flights11.5%
- 1–2 hours late70 flights15.4%
- 2+ hours late35 flights7.7%
Scale runs 0% to 100%.
Share of 454 completed flights by arrival against schedule.
35 of 213 late departures made up the time and arrived on time, 16% of them. 22 flights left on time and still arrived late.
The worst days
Worst days for JetBlue on IAH to BOS
The latest arrival of the period was on 7 July 2026, 22 hours 12 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 July 2026 | 22 hours 12 minutes | Carrier |
| 21 July 2026 | 16 hours 11 minutes | Extreme weather |
| 5 December 2025 | 14 hours 54 minutes | Carrier |
| 28 August 2026 | 4 hours 41 minutes | Late-arriving aircraft |
| 6 July 2026 | 4 hours 6 minutes | Late-arriving aircraft |
Delay causes
Why JetBlue 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 18,000 reported delay minutes.
- 40%National Airspace System
- 29%Late-arriving aircraft
- 26%Carrier
- 5%Extreme weather
- 0%Security
40% 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 7,017 minutes out of 18,000, against a national NAS share of 21%. The split is drawn from 17,675 reported delay minutes.
Cancellations run at 2.78%, against 1.89% nationally. That is roughly 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
23.1% 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.
At 1,597 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 72.7% on time across 468 flights, 17 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 17 points of difference.
One caution: this is a thin sample. 468 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 IAH to BOS
Put together: treat all of this as provisional. 468 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 55.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 454 completed flights over 12 months sit behind that.
Related
Where to go next
- IAH to BOS, every carrier
- JetBlue on BOS to IAH, the return leg
- United Airlines on IAH to BOS76.1%
- JetBlue Airways network-wide record
- George Bush Intercontinental (IAH) 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.