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Route · ATL → MDT · 2020–2025 BTS data

Atlanta to Harrisburg

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ATL to MDT (Atlanta to Harrisburg) ranks #2312 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

89.2%
On-time
+10.2 pts
vs US avg
66 min
Delay when late
5,417
Flights
#2312 of 4927
Corpus placement

Cancelled

0.9%

Best Month

Feb 2024 97%

Worst Month

Jun 2025 68%

Distance

620 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 55 10 0 0 DL
Nov 2025 83 15 1 0 DL
Oct 2025 88 12 0 0 DL
Sep 2025 81 9 0 0 DL
Aug 2025 84 14 1 0 DL
Jul 2025 88 21 1 1 DL
Jun 2025 84 27 2 0 DL
May 2025 87 18 0 0 OO,DL
Apr 2025 86 12 0 0 DL
Mar 2025 86 13 0 0 DL
Feb 2025 77 15 0 0 DL
Jan 2025 60 8 3 0 DL
Dec 2024 88 14 0 0 9E,DL
Nov 2024 82 6 0 0 DL,9E
Oct 2024 84 5 0 2 DL
Sep 2024 81 9 0 2 DL
Aug 2024 85 6 0 0 DL
Jul 2024 85 20 5 0 DL
Jun 2024 84 15 0 0 DL
May 2024 88 14 1 0 9E,DL
Apr 2024 86 10 0 0 9E,DL
Mar 2024 88 8 0 0 9E,DL
Feb 2024 70 2 1 0 9E
Jan 2024 75 13 2 0 9E,DL

ATL–MDT seasonal on-time pattern

Best: September (93.3%) · weakest: July (82.5%)

80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 88.7%

Strongest calendar month

September

93.3% on-time · ~72 flights/mo

Busiest calendar month

May

~87 flights/mo avg

Weakest calendar month

July

82.5% on-time · ~76 flights/mo

Cancellation Rate

0.9%

17 of 1,955 flights

Diversion Rate

0.3%

5 of 1,955 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

ATL - Atlanta

Full on-time, delay-cause, and seasonal performance for Atlanta, GA.

ATL on-time profile

MDT - Harrisburg

Full on-time, delay-cause, and seasonal performance for Harrisburg, PA.

MDT on-time profile

Compare the two airports

See ATL and MDT side by side on delays, cancellations, and reliability.

Compare ATL vs MDT

Origin-hub reliability standing

Among ATL's stronger departures

ATL → MDT posts a 89.2% on-time rate, landing in the ≥85% band with 67 of 144 BTS-tracked routes leaving Atlanta. The same hub also shows 75 mid-band and 2 challenged departures · fleet-wide on-time rank #217 of 4927 (highest on-time = #1).

What the Data Says About ATL to MDT

Atlanta to Harrisburg (ATL to MDT) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 89.2% on-time rate across 5,417 flights, with delays that do happen averaging 65.8 minutes. The corridor runs roughly 620 miles and is served by 8 carriers. Over the most recent 24 months, 17 of 1,955 flights were cancelled (0.9%) and 5 diverted (0.3%).

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 97% on-time, while Jun 2025 came in at just 68% - a 29-point swing worth factoring into travel timing.

On the multi-year calendar, ATL–MDT peaks in September at 93.3% on-time while May carries the heaviest traffic (~87 flights per month) ; the softest month is July at 82.5%, a 10.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ATL to MDT rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ATL to MDT ranks #2312 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from ATL to MDT? ▼
Flights from Atlanta to Harrisburg have a 89.2% on-time rate based on 5,417 flights. The average delay is 65.8 minutes. The best recent month was Feb 2024 with 97% on-time.
What is the cancellation rate for ATL to MDT? ▼
Over the last 24 months, 0.9% of flights on this route were cancelled (17 of 1,955 flights) and 0.3% were diverted.
How far is the flight from ATL to MDT? ▼
The flight distance from Atlanta (ATL) to Harrisburg (MDT) is approximately 620 miles. This route is served by 8 carriers.
When is the best time to fly from ATL to MDT? ▼
The best recent month for on-time performance was Feb 2024 (97% on-time). The worst was Jun 2025 (68% on-time). Consider booking during months with historically better performance.

Airports on this route

ATL Airport

Atlanta
MDT Airport

Harrisburg
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using ATL–MDT data

ATL–MDT runs 10.2 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare ATL and MDT airport profiles: delay causes and top routes differ even on the same corridor. ATL airport
  • If your dates flex, September (93.3% on-time) beats July (82.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 89.2% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.