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 90-minute layover misses 13% of the time at 10 am and 28% of the time at 7 pm.

Nonstops (seasonal or thin)


Delta	IAD	SLC	4h 37m	85%	1.6%	364	Flying now
United	IAD	SLC	4h 56m	81%	1.1%	350	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Salt Lake City on time. Total trip = scheduled departure to arrival, layover included (Salt Lake City is 2 h behind Dulles). Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAD 07:00 → LAX 09:26UA 325	3h 29m Los Angeles	LAX 12:55 → SLC 15:48UA 5371 · flown by SkyWest	10h 48m	100%	89%
United Details →	IAD 15:15 → LAX 17:47UA 684	2h 32m Los Angeles	LAX 20:19 → SLC 23:11UA 5744 · flown by SkyWest	9h 56m	99%	87%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	2h 19m Atlanta	ATL 10:05 → SLC 12:10DL 387	8h 10m	97%	86%
Delta Details →	IAD 08:27 → ATL 10:17DL 3080	3h 38m Atlanta	ATL 13:55 → SLC 15:51DL 423	9h 26m	98%	83%
United Details →	IAD 08:15 → DEN 10:10UA 792	3h 30m Denver	DEN 13:40 → SLC 15:13UA 1840	8h 58m	97%	82%
United Details →	IAD 06:30 → IAH 08:39UA 1935	1h 06m Houston	IAH 09:45 → SLC 11:59UA 756	7h 29m	100%	81%
Delta Details →	IAD 07:00 → SEA 09:45DL 1015	3h 45m Seattle	SEA 13:30 → SLC 16:40DL 1120	11h 40m	97%	80%
United Details →	IAD 06:30 → DEN 08:22UA 2031	3h 18m Denver	DEN 11:40 → SLC 13:13UA 1963	8h 43m	100%	79%
Tight connection: often missed
Delta Details →	IAD 15:02 → ATL 16:54DL 2135	1h 01m Atlanta	ATL 17:55 → SLC 19:58DL 653	6h 56m	73%	59%
United Details →	IAD 17:42 → ORD 18:50UA 2497	1h 20m Chicago	ORD 20:10 → SLC 22:48UA 1710	7h 06m	72%	41%
American Details →	IAD 19:31 → DFW 21:50AA 1904	1h 02m Dallas-Fort Worth	DFW 22:52 → SLC 00:36 +1AA 2378	7h 05m	52%	22%

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

ORD · 52m · leaves 10:31 12%

LAX · 1h 16m · leaves 09:10 12%

SEA · 1h 20m · leaves 07:00 13%

Afternoon and evening

ATL · 1h 01m · leaves 15:02 27%

ORD · 1h 20m · leaves 17:42 28%

DFW · 1h 02m · leaves 19:31 48%

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.


United UA 1689 IAD 13:10 → LAX Delta DL 2973 LAX 19:15 → SLC Connection details →	3h 33m	10h 55m	99%	91%
United UA 2253 IAD 08:40 → MSY Delta DL 736 MSY 13:30 → SLC Connection details →	3h 06m	9h 28m	99%	90%
United UA 325 IAD 07:00 → LAX Delta DL 1194 LAX 11:41 → SLC Connection details →	2h 15m	9h 34m	99%	89%

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