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

Connect in the morning. The same 70-minute layover misses 6% of the time at 9 am and 17% of the time at 9 pm.

Nonstops


American	BUF	ORD	2h 07m	78%	3.3%	1,230	Flying now
United	BUF	ORD	2h 03m	72%	3.0%	1,316	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time. Total trip = scheduled departure to arrival, layover included (Chicago is 1 h behind Buffalo). Layovers up to 4 hours. Pick a connection for the details.


American Details →	BUF 06:01 → CLT 08:01AA 1204	3h 00m Charlotte	CLT 11:01 → ORD 12:19AA 2908	7h 18m	98%	87%
Delta Details →	BUF 06:29 → DTW 07:42DL 2898	2h 33m Detroit	DTW 10:15 → ORD 10:50DL 3673 · flown by SkyWest	5h 21m	98%	86%
American Details →	BUF 07:15 → BOS 08:51AA 4788 · flown by Republic	3h 10m Boston	BOS 12:01 → ORD 14:02AA 1610	7h 47m	99%	86%
American Details →	BUF 06:00 → DCA 07:29AA 3668 · flown by Envoy	56m Washington	DCA 08:25 → ORD 10:00AA 4360 · flown by Republic	4h 57m	96%	83%
United Details →	BUF 06:15 → IAD 07:34UA 3668 · flown by Republic	2h 57m Dulles	IAD 10:31 → ORD 11:53UA 1252	6h 38m	95%	83%
American Details →	BUF 05:20 → PHL 06:46AA 5873 · flown by Piedmont	3h 49m Philadelphia	PHL 10:35 → ORD 12:09AA 1041	7h 49m	98%	81%
Delta Details →	BUF 09:03 → DTW 10:18DL 3639 · flown by SkyWest	2h 17m Detroit	DTW 12:35 → ORD 13:03DL 1716	5h 00m	98%	76%
Delta Details →	BUF 07:00 → JFK 08:30DL 5284 · flown by Endeavor	2h 00m New York	JFK 10:30 → ORD 12:20DL 5119 · flown by Endeavor	6h 20m	96%	74%
Tight connection: often missed
American Details →	BUF 19:35 → CLT 21:36AA 1614	1h 03m Charlotte	CLT 22:39 → ORD 00:01 +1AA 3014	5h 26m	68%	39%
American Details →	BUF 18:11 → LGA 19:40AA 4378 · flown by Republic	1h 43m New York	LGA 21:23 → ORD 23:29AA 2057	6h 13m	74%	31%
American Details →	BUF 17:25 → DCA 18:59AA 5106 · flown by PSA	1h 07m Washington	DCA 20:06 → ORD 21:42AA 2903	5h 17m	47%	29%

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

PHL · 53m · leaves 05:20 6%

DFW · 1h 20m · leaves 07:01 6%

LGA · 1h 15m · leaves 06:05 11%

Afternoon and evening

CLT · 1h 03m · leaves 19:35 32%

LGA · 1h 06m · leaves 18:10 34%

DCA · 1h 07m · leaves 17:25 53%

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.


Delta DL 2898 BUF 06:29 → DTW American AA 4103 DTW 10:33 → ORD Connection details →	2h 51m	5h 39m	97%	90%
Southwest WN 756 BUF 06:05 → BWI United UA 704 BWI 10:32 → ORD Connection details →	3h 12m	6h 43m	100%	90%
American AA 3668 BUF 06:00 → DCA United UA 2201 DCA 10:30 → ORD Connection details →	3h 01m	6h 48m	100%	90%

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