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 IAD → GSP flights land within a few points of 82% on time whatever the hour.

Nonstops (seasonal or thin)


United	IAD	GSP	1h 40m	82%	1.6%	863	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


American Details →	IAD 06:33 → CLT 08:00AA 1216	3h 07m Charlotte	CLT 11:07 → GSP 12:14AA 5802 · flown by Piedmont	5h 41m	97%	90%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	2h 11m Atlanta	ATL 09:57 → GSP 10:57DL 2158	4h 57m	97%	88%
United + Americantwo ticketsDetails →	IAD 08:15 → CLT 09:45UA 4063 · flown by Mesa	3h 20m Charlotte	CLT 13:05 → GSP 14:07AA 5805 · flown by Piedmont	5h 52m	100%	86%
United + Deltatwo ticketsDetails →	IAD 08:15 → ATL 10:14UA 2739	2h 58m Atlanta	ATL 13:12 → GSP 14:13DL 1273	5h 58m	97%	84%
American Details →	IAD 05:03 → CLT 06:35AA 5054 · flown by PSA	2h 30m Charlotte	CLT 09:05 → GSP 10:12AA 5799 · flown by Piedmont	5h 09m	94%	79%
United + Deltatwo ticketsDetails →	IAD 17:17 → ATL 19:16UA 2081	3h 38m Atlanta	ATL 22:54 → GSP 23:59DL 2281	6h 41m	95%	75%
United Details →	IAD 10:31 → ORD 11:53UA 1252	2h 02m Chicago	ORD 13:55 → GSP 17:00UA 5403 · flown by SkyWest	6h 29m	98%	74%
United + Deltatwo ticketsDetails →	IAD 12:35 → ATL 14:34UA 471	3h 26m Atlanta	ATL 18:00 → GSP 19:06DL 1021	6h 31m	95%	74%
Tight connection: often missed
Delta Details →	IAD 15:02 → ATL 16:54DL 2135	1h 06m Atlanta	ATL 18:00 → GSP 19:06DL 1021	4h 04m	74%	57%
Delta Details →	IAD 17:29 → DTW 19:07DL 1787	58m Detroit	DTW 20:05 → GSP 21:48DL 1561	4h 19m	75%	56%
United Details →	IAD 15:39 → ORD 17:02UA 1393	1h 15m Chicago	ORD 18:17 → GSP 21:26UA 5275 · flown by SkyWest	5h 47m	72%	43%

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

DFW · 1h 06m · leaves 06:14 13%

DTW · 1h 00m · leaves 06:00 14%

CLT · 1h 05m · leaves 06:33 17%

Afternoon and evening

DTW · 58m · leaves 17:29 25%

ATL · 1h 06m · leaves 15:02 26%

CLT · 1h 00m · leaves 20:22 32%

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