Carrier route record
F9BOS→ATL
Frontier Airlines · Boston to Atlanta
- Flights
- 453
- Period
- September 2025 to August 2026
- Share of route
- 9%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on BOS to ATL draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 453 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 3,726 at 80.8% on time.
The national on-time rate over the same period is 77.3%, so Frontier on BOS to ATL runs 15 points behind the country as a whole. Across a thousand flights that is about 147 extra late arrivals.
Key figures
On time
62.6%
Arrivals under 15 minutes late, of 439 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
2.87%
National rate is 1.89%
Whole route
76.8%
Every carrier on BOS to ATL, 5,050 flights
These figures cover 453 flights between September 2025 and August 2026. Beyond the headline rate, 10.0% 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
Frontier against every carrier on BOS to ATL
Frontier flew 453 of the 5,050 flights on BOS to ATL, about 9% of it. Its 62.6% on time is 14 points worse than the route as a whole, which runs 76.8%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from Delta at 80.8% to Spirit at 50.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 80.8% of the time; JetBlue Airways manages 66.9%. Sample sizes sit next to every figure, because a two-point gap across 859 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 3,726 | 80.8% | 75 min | 1.85% | B |
| JetBlue Airways | 859 | 66.9% | 70 min | 3.61% | C− |
| Frontier Airlines (this page) | 453 | 62.6% | 62 min | 2.87% | D |
| Spirit Airlinesthin sample | 12 | 50.0% | 61 min | 0.00% | F+ |
JetBlue Airways cancels 3.6% 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
Frontier flight numbers on BOS to ATL
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.
Departure window
When Frontier runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 453 flights.
- 5am–8am185 flights62.5%
- 8am–11am70 flights68.1%
- 11am–2pm198 flights60.8%
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am—
Scale runs 50% to 75%. 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 60.8% on time against 68.1% for 8am–11am. 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 11am–2pm window is the busiest, with 198 flights scheduled in it.
Across the year
Frontier on BOS to ATL through the year
August is the worst month at 46.2% on time, 29 points below June, the best at 75.0%. 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. May was the busiest month here, with 62 flights.
Across the week, Friday is the strongest day at 77.5% on time and Sunday the weakest at 47.8%, a spread of 30 points.
Arrival by arrival
How late Frontier on BOS to ATL runs when it is late
The 164 late arrivals split 55 under half an hour, 65 between 30 and 60 minutes, and 44 an hour or more.
- 15+ min early105 flights23.9%
- Within 15 min170 flights38.7%
- 15–29 min late55 flights12.5%
- 30–59 min late65 flights14.8%
- 1–2 hours late32 flights7.3%
- 2+ hours late12 flights2.7%
Scale runs 0% to 100%.
Share of 439 completed flights by arrival against schedule.
22 of 108 late departures made up the time and arrived on time, 20% of them. In the other direction, 78 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ATL.
The worst days
Worst days for Frontier on BOS to ATL
The latest arrival of the period was on 5 August 2026, 22 hours 54 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 August 2026 | 22 hours 54 minutes | Carrier |
| 24 August 2026 | 7 hours 54 minutes | Late-arriving aircraft |
| 4 January 2026 | 4 hours 17 minutes | Late-arriving aircraft |
| 25 August 2026 | 4 hours 7 minutes | Late-arriving aircraft |
| 15 February 2026 | 4 hours | Carrier |
Delay causes
Why Frontier runs late on this route
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 10,000 reported delay minutes.
- 34%National Airspace System
- 33%Carrier
- 32%Late-arriving aircraft
- 1%Extreme weather
34% 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 3,426 minutes out of 10,000, against a national NAS share of 21%. The split is drawn from 10,180 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 68.1% on time here.
Cancellations run at 2.87%, against 1.89% nationally. That is roughly 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 costs
10.0% 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.
The 946 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 67.3% on time across 453 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.
One caution: this is a thin sample. 453 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Frontier on BOS to ATL
Put together: the delay figures matter less here than the 2.87% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 439 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to ATL, every carrier
- Frontier on ATL to BOS, the return leg
- Delta Air Lines on BOS to ATL80.8%
- JetBlue Airways on BOS to ATL66.9%
- Frontier Airlines network-wide record
- Boston Logan International (BOS) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
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.