Route reliability record
BOS→AUS
Boston to Austin
- Flights
- 1,713
- Period
- September 2025 to August 2026
- Distance
- 1,698 mi
- Carriers
- 3
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 1,713 BOS to AUS flights, of which JetBlue Airways flew 426 at 74.9% on time.
Best time to fly BOS to AUS: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 84.3% of the time and Wednesday flights 76.7%, against 72.6% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.
Key figures
On time
72.6%
Arrivals under 15 minutes late, of 1,666 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
2.39%
National rate is 1.89%
Best carrier
JetBlue
74.9% on time across 426 flights
These figures cover 1,713 flights between September 2025 and August 2026. Beyond the headline rate, 10.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on BOS to AUS
The two carriers here are closely matched: about a point separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 426 | 74.9% | 61 min | 2.58% | C |
| Delta Air Lines | 1,001 | 73.7% | 87 min | 2.60% | C |
| Southwest Airlinesthin sample | 286 | 65.6% | 52 min | 1.40% | C |
No carrier stands out. JetBlue tops the table at 74.9%, about a point clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on BOS to AUS
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Boston to Austin
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. BOS → AUSBoston to Austin | JetBlue Airways | 73.0% | 74.9% | 2.58% | 5am–8am, Wed | — |
| 2. BOS → AUSBoston to Austin | Delta Air Lines | 71.8% | 73.7% | 2.60% | 5am–8am, Wed | DL 1410 06:05 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 26 points, against about a point between the best and worst carrier.
- 5am–8am485 flights84.3%
- 8am–11am185 flights83.7%
- 11am–2pm464 flights73.1%
- 2pm–5pm247 flights58.7%
- 5pm–8pm330 flights58.7%
- 8pm–5am2 flights—
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 58.7% on time, against 84.3% 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 5am–8am window is the busiest, with 485 flights scheduled in it.
Explore
Filter BOS to AUS by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On BOS to AUS, the best departure window is 5am–8am at 84.3% on time and the worst is 2pm–5pm at 58.7%, a wide gap of 25.6 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am84.3%
- 8–11am83.7%
- 11am–2pm73.1%
- 2–5pm58.7%
- 5–8pm58.7%
- 8pm–5am—
best all US flightsScale 50% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 16 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
April is the best month on the calendar at 81.2% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 181 flights.
Across the week, Wednesday is the strongest day at 76.7% on time and Sunday the weakest at 64.9%, a spread of 12 points.
Delay causes
Why this route gets delayed
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 34,000 reported delay minutes.
- 40%Carrier
- 34%Late-arriving aircraft
- 24%National Airspace System
- 2%Extreme weather
- 0%Security
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 34,000 reported delay minutes here, that single category outweighs weather by 17 to one. The split is drawn from 33,593 reported delay minutes.
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 13,000 of the 34,000 delay minutes reported here.
Cancellations sit at 2.39% against a national 1.89%, which is ordinary. Diversions add another 0.35%.
Connections and stage length
What a delay here actually costs
10.4% 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.
At 1,698 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 64.5% on time across 1,713 flights, 8 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 8 points of difference.
The sample behind these figures is 1,713 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in AUS after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 81.2% on time and September 65.4%, a swing of 16 points. If the dates move at all, move them out of September before you think about anything else. 1,666 completed flights over 12 months sit behind that.
Common questions
BOS to AUS questions
How often is BOS to AUS delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 27.4% of the 1,713 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on BOS to AUS?
JetBlue Airways leads at 74.9% on time across 426 flights. Delta Air Lines is at the other end on 73.7%, a gap of about a point. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on BOS to AUS?
The 5am–8am departure window is the strongest at 84.3% on time. The 5pm–8pm window is the weakest at 58.7%, 26 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are September delays on BOS to AUS?
September is the weakest month at 65.4% on time, compared with 81.2% in April. Across the year that is 16 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- AUS to BOS — the return legseparate record
- Boston Logan International (BOS) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- JetBlue Airways on BOS to AUS74.9%
- Delta Air Lines on BOS to AUS73.7%
- Southwest Airlines on BOS to AUS65.6%
- BOS to DCA, a related route72.6%
- DEN to AUS, a related route76.2%
- BOS to ORD, a related route71.9%
- JetBlue Airways on-time record74.9%
- Delta Air Lines on-time record73.7%
- Southwest Airlines on-time record65.6%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. BOS to AUS and AUS to BOS are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.