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 8% of the time at 9 am and 31% of the time at 4 pm.

Nonstops


American	STL	BOS	2h 41m	76%	3.0%	677	Flying now
Southwest	STL	BOS	2h 35m	67%	0.7%	934	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	STL 05:40 → MDW 06:45WN 1008	2h 25m Chicago	MDW 09:10 → BOS 12:28WN 1405	5h 48m	98%	89%
American Details →	STL 05:10 → CLT 08:03AA 858	3h 15m Charlotte	CLT 11:18 → BOS 13:33AA 1611	7h 23m	99%	87%
United Details →	STL 06:00 → ORD 07:30UA 2805	1h 45m Chicago	ORD 09:15 → BOS 12:57UA 1117	5h 57m	97%	85%
United Details →	STL 05:10 → DEN 06:32UA 362	1h 13m Denver	DEN 07:45 → BOS 13:49UA 558	7h 39m	94%	83%
Delta Details →	STL 06:00 → ATL 08:38DL 1524	1h 22m Atlanta	ATL 10:00 → BOS 12:44DL 855	5h 44m	98%	83%
American Details →	STL 05:18 → MIA 09:15AA 1716	1h 35m Miami	MIA 10:50 → BOS 14:22AA 1565	8h 03m	98%	80%
Delta Details →	STL 07:08 → ATL 09:45DL 1536	1h 25m Atlanta	ATL 11:10 → BOS 13:47DL 862	5h 39m	97%	80%
Southwest Details →	STL 06:15 → BWI 09:18WN 3894	1h 22m Baltimore	BWI 10:40 → BOS 12:10WN 887	4h 55m	98%	78%
Tight connection: often missed
American Details →	STL 13:27 → ORD 14:59AA 6352 · flown by SkyWest	1h 14m Chicago	ORD 16:13 → BOS 19:57AA 4384 · flown by Republic	5h 37m	73%	40%
United Details →	STL 11:25 → ORD 13:03UA 4395 · flown by GoJet	52m Chicago	ORD 13:55 → BOS 17:31UA 1693	5h 06m	63%	39%
American Details →	STL 13:14 → DFW 15:10AA 5655 · flown by PSA	54m Dallas-Fort Worth	DFW 16:04 → BOS 20:50AA 1048	6h 36m	59%	24%

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

DEN · 1h 13m · leaves 05:10 6%

AUS · 1h 15m · leaves 08:25 7%

DTW · 1h 01m · leaves 06:30 8%

Afternoon and evening

MSP · 54m · leaves 17:36 32%

IAH · 59m · leaves 14:57 37%

DFW · 54m · leaves 13:14 41%

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 4358 STL 05:05 → MCO Delta DL 1580 MCO 11:20 → BOS Connection details →	2h 55m	8h 19m	100%	81%
American AA 858 STL 05:10 → CLT Delta DL 5626 CLT 09:40 → BOS Connection details →	1h 37m	5h 58m	90%	77%
Southwest WN 4939 STL 05:40 → LGA Delta DL 5758 LGA 13:00 → BOS Connection details →	4h 00m	7h 44m	100%	77%

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