Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 84% on time.

Nonstops (seasonal or thin)


United	MIA	IAD	2h 43m	85%	0.4%	512	Flying now
Frontier	MIA	IAD	2h 50m	77%	1.8%	113	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.


American + Unitedtwo ticketsDetails →	MIA 08:00 → MSY 09:18AA 2168	2h 59m New Orleans	MSY 12:17 → IAD 15:50UA 2497	7h 50m	100%	91%
American + Unitedtwo ticketsDetails →	MIA 08:02 → JAX 09:27AA 3609 · flown by Envoy	2h 21m Jacksonville	JAX 11:48 → IAD 13:44UA 2826	5h 42m	100%	89%
Southwest + Unitedtwo ticketsDetails →	MIA 05:25 → MCO 06:30WN 4086	3h 07m Orlando	MCO 09:37 → IAD 11:55UA 1893	6h 30m	96%	88%
American + Unitedtwo ticketsDetails →	MIA 08:41 → CVG 11:34AA 4121 · flown by Envoy	3h 21m Hebron	CVG 14:55 → IAD 16:34UA 4018 · flown by Mesa	7h 53m	100%	85%
Delta + Unitedtwo ticketsDetails →	MIA 06:35 → MSP 09:25DL 1056	3h 04m Minneapolis	MSP 12:29 → IAD 15:56UA 1951	9h 21m	97%	85%
Delta Details →	MIA 08:17 → ATL 10:20DL 1261	1h 57m Atlanta	ATL 12:17 → IAD 14:02DL 2135	5h 45m	98%	83%
American + Unitedtwo ticketsDetails →	MIA 06:40 → ORD 09:08AA 581	1h 59m Chicago	ORD 11:07 → IAD 14:12UA 1869	7h 32m	93%	82%
American + Unitedtwo ticketsDetails →	MIA 06:42 → BOS 10:06AA 815	2h 29m Boston	BOS 12:35 → IAD 14:43UA 3413 · flown by Republic	8h 01m	100%	81%
Tight connection: often missed
Delta Details →	MIA 19:16 → ATL 21:34DL 1323	1h 19m Atlanta	ATL 22:53 → IAD 00:44 +1DL 2549	5h 28m	73%	53%
Frontier Details →	MIA 17:28 → ATL 20:00F9 4405	1h 16m Atlanta	ATL 21:16 → IAD 23:09F9 3692	5h 41m	69%	37%
American Details →	MIA 15:30 → DFW 17:50AA 1199	54m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	7h 22m	54%	25%

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

CLT · 55m · leaves 07:57 19%

Afternoon and evening

ATL · 53m · leaves 16:00 39%

CLT · 46m · leaves 17:23 45%

DFW · 54m · leaves 15:30 46%

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