Carrier route record
B6IAH→BOS
JetBlue Airways · Houston to Boston
- Flights
- 460
- Period
- July 2025 to June 2026
- Share of route
- 23%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on IAH to BOS draws a D. Roughly 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 460 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.6%, so JetBlue on IAH to BOS runs 16 points behind the country as a whole. Across a thousand flights that is about 162 extra late arrivals.
Key figures
On time
61.4%
Arrivals under 15 minutes late, of 451 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.74%
National rate is 1.81%
Whole route
72.6%
Every carrier on IAH to BOS, 2,025 flights
These figures cover 460 flights between July 2025 and June 2026. Beyond the headline rate, 18.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
JetBlue against every carrier on IAH to BOS
JetBlue flew 460 of the 2,025 flights on IAH to BOS, about 23% of it. Its 61.4% on time is 11 points worse than the route as a whole, which runs 72.6%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 75.9% to JetBlue at 61.4%.
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 | 1,565 | 75.9% | 73 min | 1.09% | B |
| JetBlue Airways (this page) | 460 | 61.4% | 73 min | 1.74% | D |
Flight by flight
JetBlue flight numbers on IAH to BOS
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 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am11 flights—
- 11am–2pm215 flights69.2%
- 2pm–5pm109 flights51.9%
- 5pm–8pm122 flights55.0%
- 8pm–5am3 flights—
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 69.2% on time, ahead of 2pm–5pm at 51.9%. 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 11am–2pm window is the busiest, with 215 flights scheduled in it.
Across the year
JetBlue on IAH to BOS through the year
Delays peak in September, when the on-time rate falls to 37.5%. December is the strongest month at 78.6%. Moving a flexible trip across that boundary buys 41 points. July was the busiest month here, with 62 flights.
Across the week, Saturday is the strongest day at 74.6% on time and Thursday the weakest at 55.2%. 19 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
One category carries most of the weight here. National Airspace System accounts for 50% of the 13,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 50%National Airspace System
- 32%Late-arriving aircraft
- 18%Carrier
- 0%Security
- 0%Extreme weather
50% 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 6,359 minutes out of 13,000, against a national NAS share of 21%. The split is drawn from 12,779 reported delay minutes.
Cancellations sit at 1.74% against a national 1.81%, which is ordinary. Diversions add another 0.22%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 18.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 75.1% on time across 460 flights, 14 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 14 points of difference.
One caution: this is a thin sample. 460 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. 460 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 61.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 451 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 BOS75.9%
- JetBlue Airways network-wide record
- George Bush Intercontinental (IAH) delay statistics
- Boston Logan International (BOS) delay statistics
- How often a connection fails at the major US hubs
- The best time of day to fly, according to 7.04 million flight records
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.