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 75-minute layover misses 3% of the time at 11 am and 35% of the time at 7 pm.

Nonstops


United	IAD	IAH	3h 25m	85%	0.4%	1,873	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAD 08:30 → PIT 09:40UA 6119 · flown by Mesa	3h 25m Pittsburgh	PIT 13:05 → IAH 15:08UA 1964	7h 38m	99%	99%
United Details →	IAD 08:15 → CLT 09:45UA 4063 · flown by Mesa	2h 03m Charlotte	CLT 11:48 → IAH 13:34UA 6236 · flown by Mesa	6h 19m	98%	88%
United Details →	IAD 08:15 → ORD 09:36UA 1775	3h 04m Chicago	ORD 12:40 → IAH 15:40UA 1448	8h 25m	100%	87%
United Details →	IAD 08:35 → BOS 10:20UA 641	3h 17m Boston	BOS 13:37 → IAH 16:57UA 1976	9h 22m	100%	87%
United Details →	IAD 06:10 → ORD 07:27UA 2070	2h 58m Chicago	ORD 10:25 → IAH 13:23UA 2638	8h 13m	100%	87%
United Details →	IAD 08:21 → RDU 09:34UA 529	3h 11m Raleigh/Durham	RDU 12:45 → IAH 14:44UA 6296 · flown by Mesa	7h 23m	100%	86%
United Details →	IAD 08:29 → EWR 09:55UA 2396	2h 41m Newark	EWR 12:36 → IAH 15:34UA 2204	8h 05m	99%	85%
United Details →	IAD 08:45 → MCO 11:08UA 379	2h 58m Orlando	MCO 14:06 → IAH 15:40UA 2406	7h 55m	99%	85%
Tight connection: often missed
United Details →	IAD 14:35 → DEN 16:29UA 1126	49m Denver	DEN 17:18 → IAH 20:55UA 1585	7h 20m	70%	52%
United Details →	IAD 15:37 → MCO 17:59UA 1101	1h 21m Orlando	MCO 19:20 → IAH 20:55UA 2215	6h 18m	73%	50%
United Details →	IAD 17:42 → ORD 18:50UA 2497	1h 12m Chicago	ORD 20:02 → IAH 22:59UA 2813	6h 17m	65%	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.

Morning

AUS · 1h 19m · leaves 08:30 3%

SAN · 1h 09m · leaves 08:26 5%

HSV · 1h 02m · leaves 09:00 8%

Afternoon and evening

DEN · 49m · leaves 14:35 30%

ORD · 1h 12m · leaves 17:42 35%

DFW · 57m · leaves 19:31 50%

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.


American AA 1216 IAD 06:33 → CLT United UA 6236 CLT 11:48 → IAH Connection details →	3h 48m	8h 01m	97%	86%
Delta DL 2127 IAD 06:00 → ATL United UA 425 ATL 11:37 → IAH Connection details →	3h 51m	7h 47m	98%	85%
Delta DL 3826 IAD 06:00 → DTW United UA 6251 DTW 10:55 → IAH Connection details →	3h 15m	7h 57m	96%	83%

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