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

No nonstop, and no clear pattern: the best connection reaches Dulles on time 84% of the time.

Best connections, one ticket

Ranked by chance you reach Dulles on time. Total trip = scheduled departure to arrival, layover included (Dulles is 3 h ahead of Ontario). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	ONT 22:00 → ATL 05:18DL 2892	2h 25m Atlanta	ATL 07:43 → IAD 09:26 +1DL 1324	8h 28m	100%	84%
American Details →	ONT 22:10 → CLT 05:48AA 2237	1h 32m Charlotte	CLT 07:20 → IAD 08:50 +1AA 5219 · flown by PSA	7h 39m	93%	80%
Alaska Details →	ONT 17:26 → SEA 20:06AS 575	2h 37m Seattle	SEA 22:43 → IAD 06:39 +1AS 367	10h 13m	98%	80%
Delta Details →	ONT 13:00 → SLC 15:47DL 3172	1h 43m Salt Lake City	SLC 17:30 → IAD 23:30DL 847	7h 30m	96%	80%
American Details →	ONT 23:59 → DFW 05:00AA 3006	2h 05m Dallas-Fort Worth	DFW 07:05 → IAD 11:07 +1AA 1906	8h 08m	93%	79%
United Details →	ONT 18:39 → SFO 20:07UA 5624 · flown by SkyWest	2h 58m San Francisco	SFO 23:05 → IAD 07:30 +1UA 1083	9h 51m	100%	79%
United Details →	ONT 05:00 → DEN 08:20UA 2446	2h 00m Denver	DEN 10:20 → IAD 15:53UA 2087	7h 53m	98%	78%
United Details →	ONT 05:45 → IAH 11:04UA 1936	1h 09m Houston	IAH 12:13 → IAD 16:30UA 2366	7h 45m	94%	77%
Tight connection: often missed
United Details →	ONT 13:50 → SFO 15:15UA 1375	1h 19m San Francisco	SFO 16:34 → IAD 00:55 +1UA 1453	8h 05m	72%	62%
American Details →	ONT 12:35 → DFW 17:50AA 2242	54m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	7h 17m	74%	33%
United Details →	ONT 18:39 → SFO 20:07UA 5624 · flown by SkyWest	1h 23m San Francisco	SFO 21:30 → IAD 05:53 +1UA 357	8h 14m	43%	31%

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 09m · leaves 05:45 6%

Afternoon and evening

DFW · 54m · leaves 12:35 26%

SFO · 1h 19m · leaves 13:50 28%

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 3816 ONT 06:20 → SEA United UA 2131 SEA 13:00 → IAD Connection details →	3h 43m	11h 46m	99%	92%
Delta DL 4443 ONT 17:21 → SLC United UA 726 SLC 23:59 → IAD Connection details →	3h 42m	9h 52m	96%	89%
Southwest WN 864 ONT 05:15 → PHX United UA 1873 PHX 08:50 → IAD Connection details →	2h 20m	8h 02m	98%	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