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 90-minute layover misses 8% of the time at 9 am and 31% of the time at 7 pm.

Nonstops (seasonal or thin)


United	IAD	MCI	2h 59m	82%	0.7%	715	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Kansas City on time. Total trip = scheduled departure to arrival, layover included (Kansas City 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 28m Denver	DEN 09:50 → MCI 12:38UA 2159	7h 08m	100%	88%
United Details →	IAD 06:30 → IAH 08:39UA 1935	3h 26m Houston	IAH 12:05 → MCI 14:15UA 6152 · flown by Mesa	8h 45m	100%	86%
United Details →	IAD 08:15 → DEN 10:10UA 792	3h 30m Denver	DEN 13:40 → MCI 16:22UA 586	9h 07m	97%	86%
Delta Details →	IAD 08:27 → ATL 10:17DL 3080	3h 07m Atlanta	ATL 13:24 → MCI 14:32DL 1443	7h 05m	98%	85%
United Details →	IAD 08:40 → IAH 10:59UA 1524	3h 36m Houston	IAH 14:35 → MCI 16:47UA 3987 · flown by Mesa	9h 07m	99%	85%
Delta Details →	IAD 11:44 → MSP 13:39DL 3699 · flown by SkyWest	1h 41m Minneapolis	MSP 15:20 → MCI 16:47DL 1630	6h 04m	95%	83%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	2h 19m Atlanta	ATL 10:05 → MCI 11:16DL 2908	6h 16m	97%	82%
United Details →	IAD 06:10 → ORD 07:27UA 2070	2h 58m Chicago	ORD 10:25 → MCI 12:22UA 5218 · flown by SkyWest	7h 12m	100%	81%
Tight connection: often missed
Delta Details →	IAD 08:27 → ATL 10:17DL 3080	48m Atlanta	ATL 11:05 → MCI 12:15DL 2747	4h 48m	73%	61%
Delta Details →	IAD 15:02 → ATL 16:54DL 2135	51m Atlanta	ATL 17:45 → MCI 18:56DL 1470	4h 54m	68%	52%
United Details →	IAD 17:41 → DEN 19:45UA 599	55m Denver	DEN 20:40 → MCI 23:25UA 1596	6h 44m	69%	45%

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 06m · leaves 08:40 9%

DTW · 1h 05m · leaves 06:00 13%

ORD · 47m · leaves 10:31 15%

Afternoon and evening

ORD · 1h 15m · leaves 17:42 31%

ATL · 51m · leaves 15:02 32%

DFW · 54m · leaves 19:31 52%

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 2031 IAD 06:30 → DEN Southwest WN 3114 DEN 10:00 → MCI Connection details →	1h 38m	7h 15m	100%	98%
United UA 2739 IAD 08:15 → ATL Delta DL 1443 ATL 13:24 → MCI Connection details →	3h 10m	7h 17m	97%	85%
United UA 792 IAD 08:15 → DEN Southwest WN 351 DEN 12:30 → MCI Connection details →	2h 20m	7h 50m	97%	85%

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