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 80-minute layover misses 6% of the time at 8 am and 2 times in 5 at 7 pm.

Nonstops


United	ATL	DEN	3h 21m	86%	0.5%	941	Flying now
Delta	ATL	DEN	3h 19m	80%	1.2%	2,810	Flying now
Southwest	ATL	DEN	3h 20m	74%	1.1%	1,075	Flying now
Frontier	ATL	DEN	3h 27m	73%	1.3%	769	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 2 h behind Atlanta). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ATL 05:30 → IAD 07:20UA 641	2h 53m Dulles	IAD 10:13 → DEN 12:05UA 1865	8h 35m	98%	91%
Southwest Details →	ATL 06:50 → STL 07:30WN 3937	1h 12m St Louis	STL 08:42 → DEN 10:02WN 3910	5h 12m	100%	90%
Southwest Details →	ATL 06:10 → LAS 07:15WN 209	1h 40m Las Vegas	LAS 08:55 → DEN 11:50WN 247	7h 40m	100%	88%
American Details →	ATL 05:20 → MIA 07:15AA 1135	1h 42m Miami	MIA 08:57 → DEN 11:19AA 1739	7h 59m	93%	88%
United Details →	ATL 09:25 → IAD 11:15UA 632	1h 33m Dulles	IAD 12:48 → DEN 14:42UA 1587	7h 17m	97%	87%
United Details →	ATL 06:07 → EWR 08:25UA 299	3h 30m Newark	EWR 11:55 → DEN 14:13UA 1999	10h 06m	99%	84%
Delta Details →	ATL 07:25 → DTW 09:20DL 1646	3h 22m Detroit	DTW 12:42 → DEN 13:54DL 1648	8h 29m	99%	83%
Delta Details →	ATL 08:15 → SLC 10:15DL 830	3h 05m Salt Lake City	SLC 13:20 → DEN 14:56DL 1623	8h 41m	99%	83%
Tight connection: often missed
Delta Details →	ATL 16:45 → SEA 19:04DL 472	52m Seattle	SEA 19:56 → DEN 23:46DL 2851	9h 01m	64%	49%
American Details →	ATL 14:10 → PHL 16:25AA 621	1h 05m Philadelphia	PHL 17:30 → DEN 19:45AA 3158	7h 35m	67%	41%
American Details →	ATL 19:43 → ORD 21:11AA 1372	1h 23m Chicago	ORD 22:34 → DEN 00:17 +1AA 1387	6h 33m	60%	32%

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

STL · 1h 12m · leaves 06:50 0%

AUS · 50m · leaves 06:00 2%

IAD · 55m · leaves 05:30 5%

Afternoon and evening

CLT · 1h 02m · leaves 18:45 50%

SFO · 50m · leaves 18:00 64%

MDW · 55m · leaves 19:35 74%

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 209 ATL 06:10 → LAS United UA 1315 LAS 09:37 → DEN Connection details →	2h 22m	8h 31m	100%	93%
Delta DL 2976 ATL 08:10 → AUS United UA 1541 AUS 12:55 → DEN Connection details →	3h 25m	8h 04m	100%	93%
Delta DL 843 ATL 15:36 → SAN Alaska AS 1619 SAN 20:01 → DEN Connection details →	3h 01m	9h 54m	97%	93%

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