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 6% of the time at 8 am and almost half the time at 5 pm.

Nonstops


United	BWI	IAH	3h 32m	85%	1.3%	906	Flying now
United	IAD	IAH	3h 25m	85%	0.4%	1,873	Flying now
United	DCA	IAH	3h 22m	84%	0.8%	2,406	Flying now
Southwest	DCA	HOU	3h 30m	77%	1.8%	1,053	Flying now
Southwest	BWI	HOU	3h 25m	77%	1.4%	1,468	Flying now
American	DCA	IAH	3h 37m	73%	5.5%	871	Flying now
Frontier	BWI	IAH	3h 28m	61%	6.0%	149	Flying now
Spirit	BWI	IAH	3h 33m	76%	2.4%	331	Not 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 Washington). 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%
American Details →	BWI 05:02 → CLT 06:26AA 1708	1h 16m Charlotte	CLT 07:42 → IAH 09:25AA 1930	5h 23m	97%	89%
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 →	BWI 08:16 → ORD 09:30UA 2749	3h 10m Chicago	ORD 12:40 → IAH 15:40UA 1448	8h 24m	100%	88%
United Details →	IAD 08:35 → BOS 10:20UA 641	3h 17m Boston	BOS 13:37 → IAH 16:57UA 1976	9h 22m	100%	87%
Southwest Details →	DCA 06:00 → MCO 08:20WN 4580	1h 20m Orlando	MCO 09:40 → HOU 11:10WN 3174	6h 10m	98%	87%
United Details →	DCA 07:15 → ORD 08:28UA 2638	1h 57m Chicago	ORD 10:25 → IAH 13:23UA 2638	7h 08m	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%
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%
American Details →	BWI 18:39 → MIA 21:25AA 1619	50m Miami	MIA 22:15 → IAH 23:59AA 2230	6h 20m	59%	40%
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

MCO · 1h 20m · leaves 06:00 2%

DFW · 1h 13m · leaves 05:00 3%

CLT · 1h 16m · leaves 05:02 3%

Afternoon and evening

MDW · 55m · leaves 15:35 46%

DFW · 48m · leaves 19:31 59%

DAL · 1h 00m · leaves 17:20 73%

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.


Southwest WN 4580 DCA 06:00 → MCO United UA 1493 MCO 11:57 → IAH Connection details →	3h 37m	8h 29m	100%	93%
Southwest WN 4689 BWI 06:20 → ATL United UA 425 ATL 11:37 → IAH Connection details →	3h 22m	7h 27m	100%	89%
Southwest WN 1119 BWI 06:45 → TPA United UA 2421 TPA 11:55 → IAH Connection details →	2h 45m	7h 37m	100%	89%

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