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 3% of the time at 9 am and 28% of the time at 8 pm.

Nonstops (seasonal or thin)


United	STL	IAD	2h 12m	77%	0.7%	717	Flying now

Best connections, any airlines

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 St Louis). Layovers up to 4 hours. Pick a connection for the details.


United Details →	STL 06:00 → ORD 07:30UA 2805	1h 10m Chicago	ORD 08:40 → IAD 11:52UA 2277	4h 52m	97%	90%
United Details →	STL 05:10 → DEN 06:32UA 362	1h 28m Denver	DEN 08:00 → IAD 13:26UA 1101	7h 16m	97%	89%
Southwest + Unitedtwo ticketsDetails →	STL 08:10 → MCI 09:15WN 3943	3h 15m Kansas City	MCI 12:30 → IAD 16:03UA 688	6h 53m	100%	89%
Southwest + Unitedtwo ticketsDetails →	STL 08:25 → MSY 10:10WN 4780	2h 07m New Orleans	MSY 12:17 → IAD 15:50UA 2497	6h 25m	97%	88%
United Details →	STL 07:20 → ORD 09:00UA 4423 · flown by GoJet	2h 07m Chicago	ORD 11:07 → IAD 14:12UA 1869	5h 52m	96%	85%
Southwest + Unitedtwo ticketsDetails →	STL 12:20 → SAV 15:15WN 654	4h 00m Savannah	SAV 19:15 → IAD 21:02UA 6165 · flown by Mesa	7h 42m	98%	83%
Delta Details →	STL 06:00 → ATL 08:38DL 1524	3h 39m Atlanta	ATL 12:17 → IAD 14:02DL 2135	7h 02m	99%	83%
American + Unitedtwo ticketsDetails →	STL 05:10 → CLT 08:03AA 858	2h 24m Charlotte	CLT 10:27 → IAD 11:55UA 4012 · flown by Mesa	5h 45m	98%	82%
Tight connection: often missed
United Details →	STL 14:57 → IAH 17:16UA 5580 · flown by SkyWest	1h 16m Houston	IAH 18:32 → IAD 22:43UA 1373	6h 46m	74%	54%
Delta Details →	STL 18:10 → DTW 20:45DL 2822	53m Detroit	DTW 21:38 → IAD 23:14DL 3988 · flown by SkyWest	4h 04m	73%	46%
Frontier Details →	STL 17:06 → ATL 20:07F9 4474	1h 09m Atlanta	ATL 21:16 → IAD 23:09F9 3692	5h 03m	72%	39%

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 12m · leaves 06:00 3%

Afternoon and evening

DTW · 53m · leaves 18:10 27%

ATL · 1h 09m · leaves 17:06 28%

DEN · 50m · leaves 16:48 51%

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