Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Delta’s ROC → ATL flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops


Delta	ROC	ATL	2h 12m	81%	2.4%	1,041	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Atlanta on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	ROC 06:10 → BWI 07:25WN 4680	55m Baltimore	BWI 08:20 → ATL 10:20WN 3931	4h 08m	96%	89%
American Details →	ROC 06:05 → PHL 07:32AA 5930 · flown by Piedmont	2h 00m Philadelphia	PHL 09:32 → ATL 11:53AA 4338 · flown by Republic	5h 48m	96%	88%
American Details →	ROC 05:00 → CLT 06:54AA 1058	2h 16m Charlotte	CLT 09:10 → ATL 10:41AA 5039 · flown by PSA	5h 41m	98%	84%
Delta Details →	ROC 06:16 → DTW 07:34DL 1752	1h 51m Detroit	DTW 09:25 → ATL 11:25DL 2777	5h 09m	97%	83%
United Details →	ROC 06:20 → ORD 07:28UA 1778	3h 01m Chicago	ORD 10:29 → ATL 13:44UA 2684	7h 24m	97%	81%
Delta Details →	ROC 06:10 → DTW 07:28DL 2495	2h 57m Detroit	DTW 10:25 → ATL 12:25DL 2856	6h 13m	100%	79%
American Details →	ROC 05:00 → ORD 05:54AA 4247 · flown by Envoy	2h 18m Chicago	ORD 08:12 → ATL 11:14AA 1363	6h 15m	100%	76%
Delta Details →	ROC 09:55 → DTW 11:18DL 5240 · flown by Endeavor	3h 39m Detroit	DTW 14:57 → ATL 17:05DL 1983	7h 10m	99%	76%
Tight connection: often missed
Delta Details →	ROC 16:28 → JFK 17:59DL 5289 · flown by Endeavor	1h 01m New York	JFK 19:00 → ATL 21:59DL 962	5h 31m	73%	52%
Delta Details →	ROC 17:48 → DTW 19:15DL 5231 · flown by Endeavor	1h 40m Detroit	DTW 20:55 → ATL 23:09DL 2294	5h 21m	71%	48%
American Details →	ROC 15:13 → PHL 16:42AA 5907 · flown by Piedmont	53m Philadelphia	PHL 17:35 → ATL 19:55AA 3041	4h 42m	69%	44%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

BWI · 55m · leaves 06:10 4%

DTW · 1h 07m · leaves 09:55 8%

Afternoon and evening

JFK · 1h 01m · leaves 16:28 27%

ORD · 1h 09m · leaves 17:52 37%

PHL · 49m · leaves 19:40 39%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Southwest WN 4680 ROC 06:10 → BWI Delta DL 1592 BWI 10:33 → ATL Connection details →	3h 08m	6h 14m	98%	86%
American AA 4247 ROC 05:00 → ORD Delta DL 1178 ORD 09:45 → ATL Connection details →	3h 51m	7h 51m	100%	85%
American AA 5904 ROC 07:05 → PHL Delta DL 2270 PHL 12:02 → ATL Connection details →	3h 30m	7h 01m	97%	82%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON