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 11 am and 1 time in 5 at 8 pm.

Nonstops (seasonal or thin)


United	SJU	IAD	4h 01m	90%	0.6%	631	Flying now
Frontier	SJU	IAD	4h 08m	64%	1.3%	75	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dulles on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


United Details →	SJU 02:05 → IAH 06:01UA 2495	1h 19m Houston	IAH 07:20 → IAD 11:28UA 1549	9h 23m	95%	86%
American Details →	SJU 00:58 → DFW 05:00AA 2742	2h 05m Dallas-Fort Worth	DFW 07:05 → IAD 11:07AA 1906	10h 09m	99%	85%
Delta Details →	SJU 06:00 → ATL 09:50DL 1879	2h 27m Atlanta	ATL 12:17 → IAD 14:02DL 2135	8h 02m	100%	84%
United Details →	SJU 07:00 → IAH 10:53UA 1644	1h 20m Houston	IAH 12:13 → IAD 16:30UA 2366	9h 30m	98%	80%
United Details →	SJU 07:40 → ORD 11:53UA 2089	1h 37m Chicago	ORD 13:30 → IAD 16:30UA 2794	8h 50m	100%	75%
Delta Details →	SJU 07:30 → ATL 11:20DL 1763	3h 39m Atlanta	ATL 14:59 → IAD 16:47DL 1695	9h 17m	99%	75%
Delta Details →	SJU 12:54 → ATL 16:47DL 1757	2h 28m Atlanta	ATL 19:15 → IAD 21:03DL 1309	8h 10m	99%	73%
United Details →	SJU 01:00 → EWR 05:10UA 2219	50m Newark	EWR 06:00 → IAD 07:22UA 1366	6h 22m	78%	72%

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 20m · leaves 07:00 2%

ATL · 57m · leaves 07:30 5%

EWR · 50m · leaves 01:00 22%

Afternoon and evening

ATL · 59m · leaves 17:56 13%

DEN · 58m · leaves 13:40 14%

CLT · 52m · leaves 15:40 21%

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.


JetBlue B6 234 SJU 02:20 → MCO United UA 276 MCO 08:55 → IAD Connection details →	3h 36m	8h 54m	98%	92%
American AA 2592 SJU 00:59 → ORD United UA 2277 ORD 08:40 → IAD Connection details →	3h 36m	10h 53m	99%	89%
Frontier F9 1823 SJU 03:10 → MCO United UA 1893 MCO 09:37 → IAD Connection details →	3h 27m	8h 45m	99%	89%

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