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, one ticket

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.


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%
United Details →	SLC 07:45 → LAX 09:15UA 5408 · flown by SkyWest	3h 28m Los Angeles	LAX 12:43 → IAD 20:48UA 1635	11h 03m	99%	88%
United Details →	SLC 05:10 → ORD 09:41UA 5635 · flown by SkyWest	1h 26m Chicago	ORD 11:07 → IAD 14:12UA 1869	7h 02m	100%	87%
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	3h 26m Denver	DEN 13:53 → IAD 19:22UA 347	8h 52m	98%	86%
Delta Details →	SLC 23:35 → ATL 05:15DL 912	2h 28m Atlanta	ATL 07:43 → IAD 09:26 +1DL 1324	7h 53m	99%	85%
Delta Details →	SLC 23:59 → JFK 06:23DL 705	3h 53m New York	JFK 10:16 → IAD 11:48 +1DL 5835 · flown by Republic	9h 49m	100%	84%
Alaska Details →	SLC 06:23 → SEA 07:35AS 1444	1h 38m Seattle	SEA 09:13 → IAD 17:11AS 737	8h 48m	100%	84%
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.


Delta DL 2874 SLC 07:50 → SEA United UA 2131 SEA 13:00 → IAD Connection details →	3h 55m	11h 16m	100%	92%
Delta DL 2077 SLC 23:36 → TPA United UA 2331 TPA 09:00 → IAD Connection details →	3h 15m	9h 46m	99%	92%
Delta DL 2069 SLC 23:36 → MCO United UA 276 MCO 08:55 → IAD Connection details →	2h 55m	9h 38m	98%	92%

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