Route reliability record
ATL→BDL
Atlanta to Hartford
- Flights
- 2,310
- Period
- September 2025 to August 2026
- Distance
- 859 mi
- Carriers
- 2
This route lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 2,310 ATL to BDL flights, with a median arrival 3 minutes early.
Best time to fly ATL to BDL: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 88.0% of the time and Wednesday flights 86.9%, against 79.6% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.6%
Arrivals under 15 minutes late, of 2,258 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.99%
National rate is 1.89%
Best carrier
Delta
79.7% on time across 2,218 flights
These figures cover 2,310 flights between September 2025 and August 2026. The median arrival is 3 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on ATL to BDL
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 |
|---|---|---|---|---|---|
| Delta Air Lines | 2,218 | 79.7% | 57 min | 1.98% | B |
| Frontier Airlinesthin sample | 92 | 77.8% | 90 min | 2.17% | B |
Flight by flight
Flights on ATL to BDL
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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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 16 points, against half a point between the best and worst carrier.
- 5am–8am22 flights—
- 8am–11am508 flights88.0%
- 11am–2pm442 flights86.9%
- 2pm–5pm500 flights75.7%
- 5pm–8pm334 flights72.1%
- 8pm–5am504 flights73.2%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 88.0% of the time, against 72.1% for the evening window. That is 16 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 508 flights scheduled in it.
Explore
Filter ATL to BDL 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 ATL to BDL, the best departure window is 8am–11am at 88.0% on time and the worst is 5pm–8pm at 72.1%, a wide gap of 15.9 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am88.0%
- 11am–2pm86.9%
- 2–5pm75.7%
- 5–8pm72.1%
- 8pm–5am73.2%
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 34 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.
July is the worst month at 59.3% on time, 34 points below September, the best at 93.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. October was the busiest month here, with 211 flights.
Across the week, Wednesday is the strongest day at 86.9% on time and Sunday the weakest at 73.7%, a spread of 13 points.
Delay causes
Why this route gets delayed
Carrier accounts for 50% of the 27,000 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 23%Late-arriving aircraft
- 21%National Airspace System
- 7%Extreme weather
- 0%Security
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 13,000 of the 27,000 delay minutes reported here. The split is drawn from 26,760 reported delay minutes.
Cancellations sit at 1.99% against a national 1.89%, which is ordinary. Diversions add another 0.26%.
Connections and stage length
What a delay here actually costs
6.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 859 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 84.2% on time across 2,310 flights, 5 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 5 points of difference.
The sample behind these figures is 2,310 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 BDL 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. September runs 93.3% on time and July 59.3%, a swing of 34 points. If the dates move at all, move them out of July before you think about anything else. 2,258 completed flights over 12 months sit behind that.
Common questions
ATL to BDL questions
How often is ATL to BDL delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.4% of the 2,310 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is ATL to BDL compared with the rest of the country?
79.6% of flights arrive on time here against a national 77.3%, a difference of 2 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on ATL to BDL?
The 8am–11am departure window is the strongest at 88.0% on time. The 5pm–8pm window is the weakest at 72.1%, 16 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 July delays on ATL to BDL?
July is the weakest month at 59.3% on time, compared with 93.3% in September. Across the year that is 34 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
- BDL to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- ATL to LGA, a related route72.3%
- ORD to BDL, a related route74.5%
- ATL to MCO, a related route70.3%
- Delta Air Lines on-time record79.7%
- Frontier Airlines on-time record77.8%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. ATL to BDL and BDL to ATL 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.