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 70-minute layover misses 6% of the time at 8 am and 44% of the time at 7 pm.

Nonstops (seasonal or thin)


United	IAD	STL	2h 28m	78%	1.0%	719	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


United + Southwesttwo ticketsDetails →	IAD 06:30 → DEN 08:22UA 2031	1h 43m Denver	DEN 10:05 → STL 13:20WN 1753	7h 50m	100%	96%
United Details →	IAD 06:10 → ORD 07:27UA 2070	3h 13m Chicago	ORD 10:40 → STL 12:11UA 1355	7h 01m	100%	89%
United + Deltatwo ticketsDetails →	IAD 08:15 → ATL 10:14UA 2739	3h 55m Atlanta	ATL 14:09 → STL 14:48DL 2700	7h 35m	98%	87%
United Details →	IAD 06:33 → EWR 07:52UA 2147	2h 01m Newark	EWR 09:53 → STL 11:41UA 3630 · flown by Republic	6h 08m	100%	86%
United Details →	IAD 10:13 → DEN 12:05UA 1865	1h 20m Denver	DEN 13:25 → STL 16:33UA 1639	7h 20m	96%	84%
United + Americantwo ticketsDetails →	IAD 08:15 → ORD 09:36UA 1775	2h 56m Chicago	ORD 12:32 → STL 13:55AA 3815 · flown by Envoy	6h 40m	98%	83%
American Details →	IAD 05:03 → CLT 06:35AA 5054 · flown by PSA	1h 01m Charlotte	CLT 07:36 → STL 08:32AA 2733	4h 29m	92%	79%
American Details →	IAD 06:33 → CLT 08:00AA 1216	3h 00m Charlotte	CLT 11:00 → STL 11:59AA 2717	6h 25m	97%	79%
Tight connection: often missed
Delta Details →	IAD 17:29 → DTW 19:07DL 1787	53m Detroit	DTW 20:00 → STL 20:39DL 1541	4h 10m	72%	53%
United Details →	IAD 17:41 → DEN 19:45UA 599	1h 00m Denver	DEN 20:45 → STL 23:57UA 214	7h 16m	74%	42%
United Details →	IAD 17:42 → ORD 18:50UA 2497	1h 05m Chicago	ORD 19:55 → STL 21:26UA 2144	4h 44m	56%	34%

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

ATL · 1h 18m · leaves 06:00 6%

ORD · 1h 02m · leaves 10:31 8%

MSP · 1h 00m · leaves 06:00 9%

Afternoon and evening

DTW · 53m · leaves 17:29 28%

CLT · 1h 00m · leaves 20:22 32%

ORD · 1h 05m · leaves 17:42 44%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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