Route profile
AUS→BOS
Flight reliability, delays and best times to fly from Austin to Boston, 1,698 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 6% of comparable major US routes (4,598 compared)
Calculated from 4,957 flights. How this is calculated · What counts as on time
AUS → BOS arrives on time 71.0% of the time; the return trip, BOS → AUS, arrives on time 73.1% of the time, a 2.2-point gap between the two directions of the same city pair.
AUS → BOS spends 25.9 minutes on the ground on a 1,698-mile trip: 17.1 minutes from pushback to wheels-up at AUS and 8.8 minutes from touchdown to gate at BOS.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
The airline matters unusually much on this route, a wider carrier-to-carrier gap than 97% of 2,692 comparable routes.
American Airlines arrived on time 76.8% of the time, against 54.2% for Southwest Airlines, flying the exact same route.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 2,692 in the comparison.
What sets this route apart
Where AUS to BOS differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
AUS to BOS struggles most at 12 PM: 55.2% of its flights scheduled then arrive on time, 22.4 points behind the 77.6% on routes of similar length at the same hour. Against all other routes the gap is 24.2 points.
Thursday is the day AUS to BOS slips furthest against routes of similar length, 66.3% on time where they average 76.6%, 10.3 points lower. Against all other routes the gap is 10.5 points.
In September, AUS to BOS runs 14.2 points below routes of similar length, 67.9% on time to 82.1%. Against all other routes the gap is 14.5 points.
Delta Air Lines’ flights on AUS to BOS arrive on time 75.2% of the time, 7 points below the 82.2% it manages on its routes of similar length. Against all other routes the gap is 6.3 points.
AUS to BOS against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 12 PM departures | 55.2% | routes of similar length | 77.6% | −22.4 pts | 230 here, 78,410 there |
| Weekday: Thursday | 66.3% | routes of similar length | 76.6% | −10.3 pts | 724 here, 214,094 there |
| Month: September | 67.9% | routes of similar length | 82.1% | −14.2 pts | 442 here, 115,520 there |
| Airline: Delta Air Lines | 75.2% | routes of similar length | 82.2% | −7.0 pts | 2,670 here, 325,710 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 1,698 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
Why AUS → BOS flights are cancelled
July 2023 – July 2026
AUS → BOS cancelled 81 of 4,957 scheduled flights — about 1 in every 61. The reason filed most often was the airline, 48.1% of the cancellations coded on this route — about 1 in every 127 scheduled flights.
Share of cancellations
Of 81 cancelled departures carrying a reason code.
What each reason means
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
39 cancellations, 48.1% of the total.
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
31 cancellations, 38.3% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
11 cancellations, 13.6% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
81 coded cancellations were recorded on AUS → BOS; the section appears from 50.
When it goes wrong
July 2023 – July 2026
75 min late
against a median of 3 min early
AUS → BOS has an average that understates its risk: a typical arrival is 3 min early, but the worst tenth are 78 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 4,957 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at BOS after arriving from AUS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 43% | Likely to miss |
| 45 min | 28% | High risk |
| 60 min | 21% | High risk |
| 90 min | 12% | Some risk |
| 120 min | 7.8% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.63% of the time and diverts 0.34% of the time, which a late arrival never shows up in.
Chance of missing is the share of 4,859 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 75 minutes late (90th-percentile gate arrival delay), over 4,957 operations.
Any other layover length: connection checker.
Best time to fly
AUS → BOS flights departing 5–9 AM arrived on time 89.5% of the time, against 58.9% for 12–3 PM departures, a gap of 30.6 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 93.5% on time from 125 flights
- 7 AM: 89.0% on time from 1,091 flights
- 8 AM to 9 AM: too few flights to score
- 10 AM: 67.1% on time from 231 flights
- 11 AM: 72.6% on time from 292 flights
- 12 PM: 55.2% on time from 234 flights
- 1 PM: 56.5% on time from 394 flights
- 2 PM: 62.1% on time from 565 flights
- 3 PM to 4 PM: too few flights to score
- 5 PM: 65.9% on time from 691 flights
- 6 PM: 67.4% on time from 988 flights
- 7 PM to 11 PM: too few flights to score
Why AUS → BOS runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for AUS → BOS. Only delays of 15 minutes or more are attributed. What the five causes mean
Late-arriving aircraft is the largest cause on AUS → BOS, at 37.5%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 89.5% of the time and 12–3 PM departures 58.9%.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Delta Air Lines | 2,729 | 75.2% | 1.83% | -6 min | 11.2% |
| JetBlue | 1,188 | 63.0% | 1.85% | 3 min | 16.5% |
| American Airlines | 677 | 76.8% | 0.44% | -9 min | 10.1% |
| Southwest Airlines | 363 | 54.2% | 1.65% | 10 min | 16.0% |
Delta Air Lines flew 55.1% of the 4,957 flights listed. JetBlue cancelled 1.85% of its flights here against 0.44% for American Airlines.
American Airlines arrived on time 22.6 percentage points more often than Southwest Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| DL2098 Delta Air Lines | 7:20 AM | 784 | 89.5% |
Weekly and seasonal patterns
By day of week
Saturday is historically the most reliable day and Thursday the least, a gap of 10.7 percentage points.
By month
- Jan: 75.9%
- Feb: 76.5%
- Mar: 68.7%
- Apr: 68.7%
- May: 65.0%
- Jun: 65.5%
- Jul: 65.5%
- Aug: 74.0%
- Sep: 67.9%
- Oct: 74.9%
- Nov: 77.5%
- Dec: 77.2%
May is historically the weakest month and November the strongest, a spread of 12.5 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 75.2% from 170 flights
- August 2023: 78.3% from 180 flights
- September 2023: 63.1% from 193 flights
- October 2023: 84.0% from 207 flights
- November 2023: 86.3% from 161 flights
- December 2023: 87.0% from 141 flights
- January 2024: too few flights to score (112)
- February 2024: too few flights to score (93)
- March 2024: too few flights to score (107)
- April 2024: 67.2% from 139 flights
- May 2024: 58.8% from 150 flights
- June 2024: 64.4% from 133 flights
- July 2024: 64.8% from 131 flights
- August 2024: 69.7% from 126 flights
- September 2024: 83.3% from 120 flights
- October 2024: 86.6% from 120 flights
- November 2024: too few flights to score (99)
- December 2024: too few flights to score (112)
- January 2025: too few flights to score (90)
- February 2025: too few flights to score (87)
- March 2025: too few flights to score (110)
- April 2025: too few flights to score (106)
- May 2025: too few flights to score (118)
- June 2025: 60.3% from 137 flights
- July 2025: 61.8% from 142 flights
- August 2025: 72.3% from 141 flights
- September 2025: 60.7% from 137 flights
- October 2025: 53.3% from 151 flights
- November 2025: 64.8% from 131 flights
- December 2025: 66.4% from 125 flights
- January 2026: too few flights to score (98)
- February 2026: too few flights to score (119)
- March 2026: 57.6% from 145 flights
- April 2026: 65.7% from 138 flights
- May 2026: 74.5% from 145 flights
- June 2026: 70.8% from 162 flights
- July 2026: 60.1% from 181 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 65.1% against 73.7% in the 12 months before — declining by 8.6 percentage points.
Data and methodology
Calculated by FlyerIntel from 4,957 AUS → BOS flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed