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

No clear winner: Southwest’s GSP → BWI flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	GSP	BWI	1h 30m	91%	1.5%	719	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	GSP 05:44 → ATL 06:45DL 3028	2h 10m Atlanta	ATL 08:55 → BWI 10:47DL 801	5h 03m	99%	85%
Delta Details →	GSP 06:45 → ATL 07:49DL 1146	3h 21m Atlanta	ATL 11:10 → BWI 13:03DL 2711	6h 18m	98%	84%
Delta Details →	GSP 07:10 → DTW 09:00DL 876	1h 10m Detroit	DTW 10:10 → BWI 11:47DL 1546	4h 37m	98%	82%
Delta Details →	GSP 10:03 → ATL 11:05DL 3089	2h 57m Atlanta	ATL 14:02 → BWI 15:53DL 2799	5h 50m	98%	77%
Delta Details →	GSP 11:12 → DTW 13:00DL 5195 · flown by Endeavor	2h 09m Detroit	DTW 15:09 → BWI 16:45DL 2480	5h 33m	96%	77%
American Details →	GSP 07:00 → CLT 08:16AA 5654 · flown by PSA	3h 19m Charlotte	CLT 11:35 → BWI 13:03AA 846	6h 03m	98%	74%
Delta Details →	GSP 11:42 → ATL 12:45DL 2158	3h 42m Atlanta	ATL 16:27 → BWI 18:23DL 2928	6h 39m	100%	68%
United Details →	GSP 10:45 → ORD 11:59UA 5361 · flown by SkyWest	2h 31m Chicago	ORD 14:30 → BWI 17:36UA 2124	6h 51m	100%	68%
Tight connection: often missed
American Details →	GSP 18:18 → CLT 19:34AA 5203 · flown by PSA	3h 11m Charlotte	CLT 22:45 → BWI 00:14 +1AA 1318	5h 56m	69%	50%
Delta Details →	GSP 18:55 → DTW 20:48DL 5090 · flown by Endeavor	52m Detroit	DTW 21:40 → BWI 23:18DL 2715	4h 23m	61%	44%
American Details →	GSP 18:43 → ORD 20:14AA 3559 · flown by Envoy	46m Chicago	ORD 21:00 → BWI 23:59AA 3866 · flown by Envoy	5h 16m	54%	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

DTW · 1h 10m · leaves 07:10 2%

CLT · 1h 10m · leaves 09:04 5%

ATL · 50m · leaves 05:44 6%

Afternoon and evening

ATL · 1h 05m · leaves 17:16 14%

DTW · 52m · leaves 18:55 39%

ORD · 46m · leaves 18:43 46%

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 3028 GSP 05:44 → ATL Southwest WN 186 ATL 10:15 → BWI Connection details →	3h 30m	6h 26m	99%	85%
American AA 3385 GSP 07:20 → ORD United UA 2653 ORD 10:51 → BWI Connection details →	2h 05m	6h 37m	96%	80%
American AA 5798 GSP 09:04 → CLT Southwest WN 477 CLT 13:10 → BWI Connection details →	2h 45m	5h 36m	98%	78%

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