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

No clear winner: United’s GSO → IAD flights land within a few points of 83% on time whatever the hour.

Nonstops (seasonal or thin)


United	GSO	IAD	1h 18m	83%	1.7%	757	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


Delta + Unitedtwo ticketsDetails →	GSO 06:00 → DTW 07:45DL 5088 · flown by Endeavor	2h 28m Detroit	DTW 10:13 → IAD 11:50UA 3500 · flown by Republic	5h 50m	94%	86%
American + Unitedtwo ticketsDetails →	GSO 07:18 → CLT 08:20AA 3965 · flown by Envoy	2h 07m Charlotte	CLT 10:27 → IAD 11:55UA 4012 · flown by Mesa	4h 37m	99%	85%
Delta + Unitedtwo ticketsDetails →	GSO 05:25 → ATL 06:44DL 3018	2h 41m Atlanta	ATL 09:25 → IAD 11:15UA 632	5h 50m	98%	84%
American + Unitedtwo ticketsDetails →	GSO 07:40 → ORD 09:00AA 3413 · flown by Envoy	2h 07m Chicago	ORD 11:07 → IAD 14:12UA 1869	6h 32m	93%	82%
Delta Details →	GSO 06:35 → ATL 07:56DL 3004	1h 54m Atlanta	ATL 09:50 → IAD 11:39DL 1444	5h 03m	99%	82%
American Details →	GSO 05:16 → CLT 06:09AA 1078	1h 11m Charlotte	CLT 07:20 → IAD 08:50AA 5219 · flown by PSA	3h 33m	94%	81%
Delta Details →	GSO 08:10 → ATL 09:32DL 1085	2h 45m Atlanta	ATL 12:17 → IAD 14:02DL 2135	5h 52m	96%	79%
American + Unitedtwo ticketsDetails →	GSO 06:07 → PHL 07:39AA 5958 · flown by Piedmont	3h 00m Philadelphia	PHL 10:39 → IAD 11:55UA 6235 · flown by Mesa	5h 48m	96%	78%
Tight connection: often missed
Delta Details →	GSO 19:02 → DTW 20:45DL 5514 · flown by Endeavor	53m Detroit	DTW 21:38 → IAD 23:14DL 3988 · flown by SkyWest	4h 12m	65%	42%
American Details →	GSO 16:11 → CLT 17:20AA 5797 · flown by Piedmont	50m Charlotte	CLT 18:10 → IAD 19:34AA 1450	3h 29m	61%	30%
American Details →	GSO 18:39 → CLT 19:45AA 1895	46m Charlotte	CLT 20:31 → IAD 22:05AA 5549 · flown by PSA	3h 26m	47%	24%

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

ATL · 59m · leaves 05:25 4%

CLT · 1h 11m · leaves 05:16 6%

DTW · 1h 05m · leaves 06:00 9%

Afternoon and evening

ATL · 1h 16m · leaves 16:35 13%

DTW · 53m · leaves 19:02 35%

CLT · 46m · leaves 18:39 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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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