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 one-hour layover misses 8% of the time at 11 am and 2 times in 5 at 7 pm.

Nonstops (seasonal or thin)


United	IAD	SAT	3h 37m	88%	0.6%	686	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Antonio on time. Total trip = scheduled departure to arrival, layover included (San Antonio is 1 h behind Dulles). Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAD 06:30 → DEN 08:22UA 2031	1h 13m Denver	DEN 09:35 → SAT 12:43UA 2625	7h 13m	100%	92%
United Details →	IAD 06:30 → IAH 08:39UA 1935	1h 00m Houston	IAH 09:39 → SAT 10:46UA 6201 · flown by Mesa	5h 16m	100%	88%
United Details →	IAD 08:15 → DEN 10:10UA 792	3h 34m Denver	DEN 13:44 → SAT 16:55UA 1022	9h 40m	97%	87%
United Details →	IAD 08:29 → EWR 09:55UA 2396	2h 25m Newark	EWR 12:20 → SAT 15:21UA 515	7h 52m	99%	84%
United Details →	IAD 06:33 → EWR 07:52UA 2147	1h 37m Newark	EWR 09:29 → SAT 12:30UA 591	6h 57m	98%	83%
United Details →	IAD 06:10 → ORD 07:27UA 2070	1h 58m Chicago	ORD 09:25 → SAT 12:29UA 490	7h 19m	96%	82%
Delta Details →	IAD 08:27 → ATL 10:17DL 3080	1h 58m Atlanta	ATL 12:15 → SAT 13:38DL 1408	6h 14m	94%	78%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	1h 56m Atlanta	ATL 09:42 → SAT 11:10DL 1121	6h 10m	96%	76%
Tight connection: often missed
United Details →	IAD 17:41 → DEN 19:45UA 599	54m Denver	DEN 20:39 → SAT 23:55UA 395	7h 14m	67%	44%
United Details →	IAD 17:42 → ORD 18:50UA 2497	1h 08m Chicago	ORD 19:58 → SAT 22:57UA 1394	6h 15m	60%	33%
American Details →	IAD 19:31 → DFW 21:50AA 1904	1h 00m Dallas-Fort Worth	DFW 22:50 → SAT 23:58AA 1599	5h 27m	51%	19%

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

IAH · 1h 09m · leaves 08:40 8%

MSP · 55m · leaves 06:00 12%

LAX · 47m · leaves 06:11 51%

Afternoon and evening

DEN · 54m · leaves 17:41 33%

ORD · 1h 08m · leaves 17:42 40%

DFW · 1h 00m · leaves 19:31 49%

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.


United UA 1073 IAD 08:45 → MIA American AA 4069 MIA 15:35 → SAT Connection details →	4h 00m	10h 00m	99%	82%
United UA 1865 IAD 10:13 → DEN Frontier F9 2356 DEN 15:40 → SAT Connection details →	3h 35m	9h 43m	97%	80%
United UA 1252 IAD 10:31 → ORD American AA 4176 ORD 14:59 → SAT Connection details →	3h 06m	8h 28m	100%	79%

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