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

Nonstops (seasonal or thin)


United	STT	IAD	4h 13m	82%	1.8%	336	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.


American + Unitedtwo ticketsDetails →	STT 11:43 → CLT 15:49AA 2431	3h 55m Charlotte	CLT 19:44 → IAD 21:20UA 3998 · flown by Mesa	9h 37m	100%	78%
Delta Details →	STT 15:29 → ATL 19:29DL 1889	3h 24m Atlanta	ATL 22:53 → IAD 00:44 +1DL 2549	9h 15m	100%	74%
United Details →	STT 13:22 → IAH 17:25UA 2208	2h 55m Houston	IAH 20:20 → IAD 00:31 +1UA 2775	11h 09m	100%	72%
Delta + Unitedtwo ticketsDetails →	STT 13:20 → ATL 17:18DL 1823	2h 14m Atlanta	ATL 19:32 → IAD 21:30UA 2634	8h 10m	89%	68%
American Details →	STT 11:52 → CLT 15:54AA 797	2h 10m Charlotte	CLT 18:04 → IAD 19:33AA 2953	7h 41m	93%	57%
Delta + Frontiertwo ticketsDetails →	STT 15:33 → ATL 19:30DL 1883	1h 46m Atlanta	ATL 21:16 → IAD 23:09F9 3692	7h 36m	83%	45%
American Details →	STT 16:46 → CLT 20:57AA 1965	1h 48m Charlotte	CLT 22:45 → IAD 00:10 +1AA 1242	7h 24m	89%	35%

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.

Afternoon and evening

IAH · 1h 07m · leaves 13:22 10%

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