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 87% on time.

Nonstops (seasonal or thin)


United	SLC	IAD	4h 08m	89%	1.4%	348	Flying now
Delta	SLC	IAD	4h 00m	84%	1.6%	364	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 (Dulles is 2 h ahead of Salt Lake City). Layovers up to 4 hours. Pick a connection for the details.


Delta + Unitedtwo ticketsDetails →	SLC 07:50 → SEA 09:05DL 2874	3h 55m Seattle	SEA 13:00 → IAD 21:06UA 2131	11h 16m	100%	92%
Delta + Unitedtwo ticketsDetails →	SLC 23:36 → TPA 05:45DL 2077	3h 15m Tampa	TPA 09:00 → IAD 11:22 +1UA 2331	9h 46m	99%	92%
Delta + Unitedtwo ticketsDetails →	SLC 23:36 → MCO 06:00DL 2069	2h 55m Orlando	MCO 08:55 → IAD 11:14 +1UA 276	9h 38m	98%	92%
Delta + Unitedtwo ticketsDetails →	SLC 18:30 → DEN 20:02DL 1586	3h 57m Denver	DEN 23:59 → IAD 05:27 +1UA 1924	8h 57m	96%	90%
Delta + Unitedtwo ticketsDetails →	SLC 17:10 → LAX 18:10DL 1161	3h 20m Los Angeles	LAX 21:30 → IAD 05:36 +1UA 2632	10h 26m	97%	90%
United Details →	SLC 05:15 → DEN 06:54UA 5683 · flown by SkyWest	1h 06m Denver	DEN 08:00 → IAD 13:26UA 1101	6h 11m	96%	90%
Delta Details →	SLC 23:50 → DTW 05:19DL 2841	3h 31m Detroit	DTW 08:50 → IAD 10:23 +1DL 2884	8h 35m	100%	90%
Southwest + Unitedtwo ticketsDetails →	SLC 06:05 → AUS 09:45WN 4932	2h 15m Austin	AUS 12:00 → IAD 16:19UA 2344	8h 14m	100%	89%
Tight connection: often missed
United Details →	SLC 16:18 → ORD 20:40UA 2072	1h 00m Chicago	ORD 21:40 → IAD 00:45 +1UA 2766	6h 27m	66%	44%
American Details →	SLC 14:00 → DFW 17:50AA 2613	54m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	6h 52m	53%	24%
United Details →	SLC 20:08 → SFO 21:10UA 2097	1h 25m San Francisco	SFO 22:35 → IAD 06:58 +1UA 2837	8h 50m	26%	17%

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 16m · leaves 06:45 4%

DEN · 1h 06m · leaves 05:15 4%

SFO · 51m · leaves 06:05 16%

Afternoon and evening

IAH · 1h 20m · leaves 13:00 11%

ORD · 1h 00m · leaves 16:18 34%

DFW · 54m · leaves 14:00 47%

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