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, 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.


Delta Details →	MIA 08:17 → ATL 10:20DL 1261	1h 57m Atlanta	ATL 12:17 → IAD 14:02DL 2135	5h 45m	98%	83%
Delta Details →	MIA 06:00 → ATL 08:05DL 1249	1h 45m Atlanta	ATL 09:50 → IAD 11:39DL 1444	5h 38m	96%	80%
American Details →	MIA 06:21 → CLT 08:35AA 2187	2h 30m Charlotte	CLT 11:05 → IAD 12:38AA 5220 · flown by PSA	6h 17m	98%	79%
United Details →	MIA 08:48 → IAH 10:42UA 2417	1h 31m Houston	IAH 12:13 → IAD 16:30UA 2366	7h 42m	93%	75%
Frontier Details →	MIA 06:50 → DFW 09:07F9 2135	2h 13m Dallas-Fort Worth	DFW 11:20 → IAD 15:33F9 3208	8h 43m	95%	75%
Delta Details →	MIA 14:40 → MSP 17:40DL 2129	2h 15m Minneapolis	MSP 19:55 → IAD 23:25DL 4129 · flown by SkyWest	8h 45m	95%	72%
Delta Details →	MIA 10:40 → ATL 12:48DL 2836	2h 11m Atlanta	ATL 14:59 → IAD 16:47DL 1695	6h 07m	96%	72%
Delta Details →	MIA 14:09 → ATL 16:15DL 1332	3h 00m Atlanta	ATL 19:15 → IAD 21:03DL 1309	6h 55m	96%	70%
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.


American AA 2168 MIA 08:00 → MSY United UA 2497 MSY 12:17 → IAD Connection details →	2h 59m	7h 50m	100%	91%
American AA 3609 MIA 08:02 → JAX United UA 2826 JAX 11:48 → IAD Connection details →	2h 21m	5h 42m	100%	89%
Southwest WN 4086 MIA 05:25 → MCO United UA 1893 MCO 09:37 → IAD Connection details →	3h 07m	6h 30m	96%	88%

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