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, any airlines

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.


JetBlue + Unitedtwo ticketsDetails →	SJU 02:20 → MCO 05:19B6 234	3h 36m Orlando	MCO 08:55 → IAD 11:14UA 276	8h 54m	98%	92%
American + Unitedtwo ticketsDetails →	SJU 00:59 → ORD 05:04AA 2592	3h 36m Chicago	ORD 08:40 → IAD 11:52UA 2277	10h 53m	99%	89%
Frontier + Unitedtwo ticketsDetails →	SJU 03:10 → MCO 06:10F9 1823	3h 27m Orlando	MCO 09:37 → IAD 11:55UA 1893	8h 45m	99%	89%
United Details →	SJU 02:05 → IAH 06:01UA 2495	1h 19m Houston	IAH 07:20 → IAD 11:28UA 1549	9h 23m	95%	86%
American + Unitedtwo ticketsDetails →	SJU 00:58 → DFW 05:00AA 2742	2h 20m Dallas-Fort Worth	DFW 07:20 → IAD 11:26UA 2639	10h 28m	97%	86%
Delta Details →	SJU 06:00 → ATL 09:50DL 1879	2h 27m Atlanta	ATL 12:17 → IAD 14:02DL 2135	8h 02m	100%	84%
Frontier + Unitedtwo ticketsDetails →	SJU 06:00 → FLL 08:48F9 3017	3h 25m Fort Lauderdale	FLL 12:13 → IAD 14:49UA 1421	8h 49m	95%	82%
Frontier + Unitedtwo ticketsDetails →	SJU 07:30 → MIA 10:15F9 3377	2h 55m Miami	MIA 13:10 → IAD 15:53UA 2435	8h 23m	93%	81%

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.

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