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 one-hour layover misses 8% of the time at 9 am and 2 times in 5 at 7 pm.

Nonstops


United	ATL	ORD	2h 18m	76%	1.7%	1,684	Flying now
American	ATL	ORD	2h 20m	72%	3.1%	1,369	Flying now
Delta	ATL	ORD	2h 10m	70%	2.3%	2,630	Flying now
Frontier	ATL	ORD	2h 30m	65%	3.1%	712	Flying now
Spirit	ATL	ORD	2h 11m	80%	0.0%	45	Not 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 Atlanta). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ATL 05:30 → IAD 07:20UA 641	3h 11m Dulles	IAD 10:31 → ORD 11:53UA 1252	7h 23m	98%	89%
American Details →	ATL 06:24 → CLT 07:55AA 5176 · flown by PSA	3h 06m Charlotte	CLT 11:01 → ORD 12:19AA 2908	6h 55m	97%	82%
United Details →	ATL 07:05 → IAH 08:15UA 532	1h 20m Houston	IAH 09:35 → ORD 12:29UA 2124	6h 24m	95%	81%
American Details →	ATL 05:20 → MIA 07:15AA 1135	1h 13m Miami	MIA 08:28 → ORD 10:59AA 1431	6h 39m	90%	79%
United Details →	ATL 07:30 → DEN 08:51UA 340	2h 24m Denver	DEN 11:15 → ORD 14:55UA 2865	8h 25m	98%	79%
American Details →	ATL 06:00 → PHL 08:11AA 3270	2h 24m Philadelphia	PHL 10:35 → ORD 12:09AA 1041	7h 09m	99%	79%
United Details →	ATL 09:25 → IAD 11:15UA 632	2h 00m Dulles	IAD 13:15 → ORD 14:29UA 2331	6h 04m	98%	78%
Delta Details →	ATL 07:25 → DTW 09:20DL 1646	55m Detroit	DTW 10:15 → ORD 10:50DL 3673 · flown by SkyWest	4h 25m	88%	78%
Tight connection: often missed
Delta Details →	ATL 17:10 → DTW 19:11DL 2067	49m Detroit	DTW 20:00 → ORD 20:31DL 1665	4h 21m	60%	38%
American Details →	ATL 14:10 → PHL 16:25AA 621	1h 15m Philadelphia	PHL 17:40 → ORD 19:26AA 1012	6h 16m	71%	37%
American Details →	ATL 19:00 → MIA 21:00AA 1367	50m Miami	MIA 21:50 → ORD 00:26 +1AA 2323	6h 26m	24%	14%

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

BOS · 1h 11m · leaves 08:35 4%

IAD · 55m · leaves 05:30 5%

IAH · 1h 20m · leaves 07:05 5%

Afternoon and evening

PHL · 52m · leaves 18:29 49%

DFW · 49m · leaves 16:16 62%

MIA · 50m · leaves 19:00 76%

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 1523 ATL 07:35 → SDF American AA 4704 SDF 11:05 → ORD Connection details →	2h 11m	5h 09m	98%	90%
Southwest WN 3937 ATL 06:50 → STL United UA 4517 STL 10:20 → ORD Connection details →	2h 50m	6h 02m	100%	89%
Delta DL 5450 ATL 07:40 → CHS United UA 592 CHS 11:31 → ORD Connection details →	2h 31m	6h 29m	100%	88%

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