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

No clear winner: airlines and hours on this route all land within a few points of 78% on time.

Nonstops


Delta	ATL	BUF	2h 06m	81%	1.8%	1,250	Flying now
Frontier	ATL	BUF	2h 09m	66%	3.0%	270	Flying now
Southwest	ATL	BUF	–	0%few flights	0.0%	1	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	ATL 05:30 → IAD 07:20UA 641	1h 05m Dulles	IAD 08:25 → BUF 09:51UA 3514 · flown by Republic	4h 21m	98%	88%
American Details →	ATL 06:24 → CLT 07:55AA 5176 · flown by PSA	3h 15m Charlotte	CLT 11:10 → BUF 12:54AA 1616	6h 31m	97%	81%
Southwest Details →	ATL 07:00 → BWI 08:50WN 4364	2h 00m Baltimore	BWI 10:50 → BUF 12:05WN 762	5h 05m	97%	80%
Delta Details →	ATL 12:21 → MSP 13:57DL 2901	1h 25m Minneapolis	MSP 15:22 → BUF 18:27DL 1749	6h 06m	95%	79%
Delta Details →	ATL 07:44 → JFK 10:00DL 2420	3h 29m New York	JFK 13:29 → BUF 15:09DL 5296 · flown by Endeavor	7h 25m	99%	77%
American Details →	ATL 07:05 → PHL 09:15AA 1428	3h 35m Philadelphia	PHL 12:50 → BUF 14:19AA 6041 · flown by Piedmont	7h 14m	98%	74%
Delta Details →	ATL 09:18 → DTW 11:10DL 1298	2h 53m Detroit	DTW 14:03 → BUF 15:21DL 3642 · flown by SkyWest	6h 03m	99%	74%
JetBlue Details →	ATL 07:00 → BOS 09:34B6 1896	1h 31m Boston	BOS 11:05 → BUF 12:36B6 1215	5h 36m	83%	73%
Tight connection: often missed
United Details →	ATL 14:41 → IAD 16:35UA 1831	55m Dulles	IAD 17:30 → BUF 19:03UA 4823 · flown by CommuteAir	4h 22m	71%	52%
JetBlue Details →	ATL 18:23 → JFK 21:00B6 520	1h 29m New York	JFK 22:29 → BUF 00:13 +1B6 102	5h 50m	71%	40%
American Details →	ATL 14:10 → PHL 16:25AA 621	1h 15m Philadelphia	PHL 17:40 → BUF 19:12AA 6114 · flown by Piedmont	5h 02m	71%	37%

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

IAD · 1h 05m · leaves 05:30 2%

PHL · 51m · leaves 09:50 21%

Afternoon and evening

BWI · 1h 10m · leaves 19:50 36%

ORD · 1h 06m · leaves 17:17 39%

DFW · 56m · leaves 16:16 59%

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.


Frontier F9 3512 ATL 05:05 → BOS JetBlue B6 1215 BOS 11:05 → BUF Connection details →	3h 13m	7h 31m	96%	86%
Delta DL 2432 ATL 08:35 → BOS American AA 4440 BOS 13:55 → BUF Connection details →	2h 41m	7h 09m	98%	86%
Delta DL 3144 ATL 07:38 → CLT American AA 1616 CLT 11:10 → BUF Connection details →	2h 17m	5h 17m	94%	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