Route reliability record
AUS→BOS
Austin to Boston
- Flights
- 1,713
- Period
- September 2025 to August 2026
- Distance
- 1,698 mi
- Carriers
- 3
This route draws a D. 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 1,713 AUS to BOS flights, of which Delta Air Lines flew 1,001 at 69.6% on time.
Best time to fly AUS to BOS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 87.5% of the time and Saturday flights 72.0%, against 64.5% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 13 points behind the country as a whole. Across a thousand flights that is about 128 extra late arrivals.
Key figures
On time
64.5%
Arrivals under 15 minutes late, of 1,664 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.69%
National rate is 1.89%
Best carrier
Delta
69.6% on time across 1,001 flights
These figures cover 1,713 flights between September 2025 and August 2026. Beyond the headline rate, 14.5% 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
Which airline is most reliable on AUS to BOS
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 69.6% of the time; JetBlue Airways manages 59.0%. Sample sizes sit next to every figure, because a two-point gap across 426 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 1,001 | 69.6% | 90 min | 2.70% | C |
| JetBlue Airways | 426 | 59.0% | 82 min | 3.29% | D− |
| Southwest Airlinesthin sample | 286 | 54.8% | 52 min | 1.75% | F |
JetBlue Airways cancels 3.3% 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
Flights on AUS to BOS
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.
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.
Best ways to make this trip
The most reliable ways to fly Austin to Boston
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. AUS → BOSAustin to Boston | Delta Air Lines | 67.7% | 69.6% | 2.70% | 5am–8am, Sat | DL 2098 07:20 |
| 2. AUS → BOSAustin to Boston | JetBlue Airways | 57.1% | 59.0% | 3.29% | 8am–11am, Tue | — |
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 37 points, against 11 points between the best and worst carrier.
- 5am–8am346 flights87.5%
- 8am–11am168 flights71.4%
- 11am–2pm338 flights50.5%
- 2pm–5pm372 flights55.8%
- 5pm–8pm488 flights62.5%
- 8pm–5am1 flights—
Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 50.5% on time against 87.5% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 5pm–8pm window is the busiest, with 488 flights scheduled in it.
Explore
Filter AUS to BOS 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 AUS to BOS, the best departure window is 5am–8am at 87.5% on time and the worst is 11am–2pm at 50.5%, a wide gap of 37.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am87.5%
- 8–11am71.4%
- 11am–2pm50.5%
- 2–5pm55.8%
- 5–8pm62.5%
- 8pm–5am—
best all US flightsScale 40% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 21 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.
May is the best month on the calendar at 74.5% 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, Saturday is the strongest day at 72.0% on time and Friday the weakest at 59.8%, 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 47,000 reported delay minutes.
- 35%National Airspace System
- 34%Late-arriving aircraft
- 30%Carrier
- 1%Extreme weather
- 0%Security
35% 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 17,000 minutes out of 47,000, against a national NAS share of 21%. The split is drawn from 46,965 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.5% on time here.
Cancellations run at 2.69%, against 1.89% nationally. That is about 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 actually costs
14.5% 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 72.6% on time across 1,713 flights, 8 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 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 BOS 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. May runs 74.5% on time and October 53.3%, a swing of 21 points. If the dates move at all, move them out of October before you think about anything else. 1,664 completed flights over 12 months sit behind that.
Common questions
AUS to BOS questions
How often is AUS to BOS delayed?
About one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 35.5% 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 AUS to BOS?
Delta Air Lines leads at 69.6% on time across 1,001 flights. JetBlue Airways is at the other end on 59.0%, a gap of 11 points. 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 AUS to BOS?
The 5am–8am departure window is the strongest at 87.5% on time. The 11am–2pm window is the weakest at 50.5%, 37 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 October delays on AUS to BOS?
October is the weakest month at 53.3% on time, compared with 74.5% in May. Across the year that is 21 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
- BOS to AUS — the return legseparate record
- Austin-Bergstrom International (AUS) delay statistics
- Boston Logan International (BOS) delay statistics
- Delta Air Lines on AUS to BOS69.6%
- JetBlue Airways on AUS to BOS59.0%
- Southwest Airlines on AUS to BOS54.8%
- AUS to DEN, a related route78.9%
- DCA to BOS, a related route70.1%
- AUS to DFW, a related route74.9%
- Delta Air Lines on-time record69.6%
- JetBlue Airways on-time record59.0%
- Southwest Airlines on-time record54.8%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. AUS to BOS and BOS to AUS are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed AUS to BOS’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.