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 50-minute layover misses 1 time in 10 at 11 am and 42% of the time at 10 pm.

Nonstops


United	IAH	IAD	3h 08m	82%	0.4%	1,871	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAH 07:30 → MSY 08:46UA 491	3h 31m New Orleans	MSY 12:17 → IAD 15:50UA 2497	7h 20m	100%	91%
United Details →	IAH 07:20 → SAT 08:27UA 2250	3h 34m San Antonio	SAT 12:01 → IAD 16:28UA 2250	8h 08m	100%	91%
United Details →	IAH 05:15 → DEN 06:47UA 1874	1h 13m Denver	DEN 08:00 → IAD 13:26UA 1101	7h 11m	97%	90%
United Details →	IAH 08:00 → MCI 10:03UA 2266	2h 27m Kansas City	MCI 12:30 → IAD 16:03UA 688	7h 03m	100%	89%
United Details →	IAH 05:04 → ORD 07:59UA 1044	3h 08m Chicago	ORD 11:07 → IAD 14:12UA 1869	8h 08m	100%	89%
United Details →	IAH 07:35 → AUS 08:39UA 2016	3h 21m Austin	AUS 12:00 → IAD 16:19UA 2344	7h 44m	100%	89%
United Details →	IAH 08:30 → DEN 10:05UA 2816	3h 48m Denver	DEN 13:53 → IAD 19:22UA 347	9h 52m	100%	87%
United Details →	IAH 12:05 → AUS 13:12UA 1859	3h 48m Austin	AUS 17:00 → IAD 21:19UA 376	8h 14m	100%	87%
Tight connection: often missed
United Details →	IAH 15:05 → HSV 17:08UA 4946 · flown by CommuteAir	52m Huntsville	HSV 18:00 → IAD 21:06UA 4351 · flown by CommuteAir	5h 01m	72%	60%
United Details →	IAH 11:55 → ORD 14:51UA 2827	1h 02m Chicago	ORD 15:53 → IAD 19:02UA 2437	6h 07m	68%	47%
American Details →	IAH 16:18 → DFW 17:48AA 3583 · flown by Envoy	56m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	5h 34m	67%	30%

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

DEN · 1h 13m · leaves 05:15 3%

ATL · 1h 07m · leaves 05:40 4%

SAT · 1h 15m · leaves 09:39 6%

Afternoon and evening

DFW · 56m · leaves 16:18 33%

LAX · 47m · leaves 20:15 42%

PHL · 48m · leaves 14:31 55%

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 1050 IAH 06:30 → MSP United UA 1951 MSP 12:29 → IAD Connection details →	3h 11m	8h 26m	96%	83%
American AA 3002 IAH 07:00 → DFW United UA 358 DFW 12:25 → IAD Connection details →	3h 54m	8h 31m	96%	81%
United UA 2469 IAH 08:00 → MSP Delta DL 3783 MSP 14:30 → IAD Connection details →	3h 37m	9h 04m	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