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 5% of the time at 8 am and barely half the time at 7 pm.

Nonstops


American	BOS	STL	3h 13m	81%	2.4%	677	Flying now
Southwest	BOS	STL	3h 05m	74%	1.0%	935	Flying now

Best connections, one ticket

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


Southwest Details →	BOS 06:25 → DEN 08:50WN 4156	1h 15m Denver	DEN 10:05 → STL 13:20WN 1753	7h 55m	95%	91%
United Details →	BOS 06:00 → ORD 07:58UA 1414	2h 42m Chicago	ORD 10:40 → STL 12:11UA 1355	7h 11m	100%	87%
Delta Details →	BOS 08:05 → ATL 10:49DL 923	3h 20m Atlanta	ATL 14:09 → STL 14:48DL 2700	7h 45m	98%	86%
American Details →	BOS 06:00 → PHL 07:37AA 1146	1h 23m Philadelphia	PHL 09:00 → STL 10:36AA 2720	5h 35m	96%	86%
United Details →	BOS 06:05 → EWR 07:29UA 1833	2h 24m Newark	EWR 09:53 → STL 11:41UA 3630 · flown by Republic	6h 36m	98%	85%
American Details →	BOS 07:00 → ORD 09:01AA 1509	3h 31m Chicago	ORD 12:32 → STL 13:55AA 3815 · flown by Envoy	7h 55m	98%	83%
Delta Details →	BOS 05:30 → DTW 07:39DL 1019	1h 11m Detroit	DTW 08:50 → STL 09:32DL 2868	5h 02m	96%	82%
United Details →	BOS 09:40 → DEN 12:12UA 662	1h 13m Denver	DEN 13:25 → STL 16:33UA 1639	7h 53m	94%	81%
Tight connection: often missed
Delta Details →	BOS 19:15 → ATL 22:19DL 973	51m Atlanta	ATL 23:10 → STL 23:53DL 1403	5h 41m	73%	58%
United Details →	BOS 16:57 → DEN 19:45UA 800	1h 00m Denver	DEN 20:45 → STL 23:57UA 214	8h 00m	75%	43%
United Details →	BOS 17:00 → ORD 19:00UA 2040	55m Chicago	ORD 19:55 → STL 21:26UA 2144	5h 26m	49%	29%

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

DFW · 1h 19m · leaves 06:00 4%

DTW · 1h 11m · leaves 05:30 4%

ORD · 1h 02m · leaves 06:00 5%

Afternoon and evening

ORD · 55m · leaves 17:00 51%

DFW · 50m · leaves 17:57 56%

DCA · 46m · leaves 17:23 63%

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.


American AA 3324 BOS 05:10 → ORD United UA 1355 ORD 10:40 → STL Connection details →	3h 36m	8h 01m	99%	86%
United UA 1834 BOS 08:15 → ORD American AA 3815 ORD 12:32 → STL Connection details →	2h 20m	6h 40m	98%	84%
JetBlue B6 1097 BOS 08:30 → ATL Delta DL 2700 ATL 14:09 → STL Connection details →	2h 53m	7h 20m	94%	82%

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