Route reliability record
DFW→BOS
Dallas-Fort Worth to Boston
- Flights
- 3,744
- Period
- July 2025 to June 2026
- Distance
- 1,562 mi
- Carriers
- 4
This route carries a cancellation problem, not just a delay problem: 3.2% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, about two flights in three arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 3,744 flights, of which Delta Air Lines flew 861 at 77.4% on time.
The national on-time rate over the same period is 77.6%, so this route runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
67.1%
Arrivals under 15 minutes late, of 3,615 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
3.21%
National rate is 1.81%
Best carrier
Delta
77.4% on time across 861 flights
These figures cover 3,744 flights between July 2025 and June 2026. Beyond the headline rate, 13.6% 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
Which airline is most reliable on DFW to BOS
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 77.4% of the time; American Airlines manages 64.7%. Sample sizes sit next to every figure, because a two-point gap across 2,639 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 861 | 77.4% | 100 min | 2.44% | B |
| American Airlines | 2,639 | 64.7% | 69 min | 3.45% | D− |
| JetBlue Airwaysthin sample | 231 | 55.9% | 105 min | 3.46% | D− |
| Spirit Airlinesthin sample | 13 | 46.2% | 70 min | 0.00% | F+ |
American Airlines cancels 3.5% 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.
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 46 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am699 flights87.0%
- 8am–11am715 flights73.8%
- 11am–2pm737 flights62.3%
- 2pm–5pm551 flights50.3%
- 5pm–8pm1,008 flights61.7%
- 8pm–5am34 flights40.6%
Scale runs 30% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 40.6% on time, against 87.0% 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 5pm–8pm window is the busiest, with 1,008 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 28 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.
Delays peak in October, when the on-time rate falls to 49.7%. March is the strongest month at 78.0%. Moving a flexible trip across that boundary buys 28 points. July was the busiest month here, with 369 flights.
Across the week, Saturday is the strongest day at 71.8% on time and Sunday the weakest at 63.1%. 9 points is a smaller lever than departure hour, but it is free.
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 91,000 reported delay minutes.
- 40%Late-arriving aircraft
- 29%Carrier
- 25%National Airspace System
- 6%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 91,000 reported delay minutes here, that single category outweighs weather by 7 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 90,928 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 87.0% on time here.
Cancellations run at 3.21%, against 1.81% nationally. That is about one flight in 30 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.6% 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 1,562 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 76.1% on time across 3,740 flights, 9 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 9 points of difference.
The sample behind these figures is 3,744 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.
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.21% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 3,615 completed flights over 12 months sit behind that.
Common questions
DFW to BOS questions
How often is DFW to BOS delayed?
About one flight in three arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 32.9% of the 3,744 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on DFW to BOS?
Delta Air Lines leads at 77.4% on time across 861 flights. American Airlines is at the other end on 64.7%, a gap of 13 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 DFW to BOS?
The 5am–8am departure window is the strongest at 87.0% on time. The 8pm–5am window is the weakest at 40.6%, 46 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 DFW to BOS?
October is the weakest month at 49.7% on time, compared with 78.0% in March. Across the year that is 28 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 DFW — the return legseparate record
- Dallas/Fort Worth International (DFW) delay statistics
- Boston Logan International (BOS) delay statistics
- Delta Air Lines on-time record77.4%
- American Airlines on-time record64.7%
- JetBlue Airways on-time record55.9%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. DFW to BOS and BOS to DFW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.