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4 nonstop, 40 with 1 connection, 6 with 2 · ranked by overall best · 16 hidden by your Most reliable time setting (they leave at other times of day) · showing the top 3
Most reliable time: morning departures (5–11 AM), the window with the best on-time odds for this trip. Turn off “Most reliable” under Departure time in Advanced settings to see every time.
34 matching trips
Why this is our top pick
- This morning flight leaves in the most reliable time of day on this route: its best departures have a 79% reliability rating vs 75% for midday departures.
- United trips we compared arrive on time 80% of the time on average, 6 points more often than Alaska, American and Delta (74%).
- Compared with the next-best option (United 1865 + United 1302 on the Airbus A321neo), it arrives on time 11 points more often; it flies a newer plane (about 3 vs 12 years old).
- Legroom was comparable across the flights we compared (30 in), so it didn't set them apart.
9:55 AM2:57 PMIAD → SAN
United · UA 1865 / UA 1302
8h 02m1 stop
1h 26m in DEN
One ticket
82%arrive on time94% connections madeCheck fares- 8:15 AM2:57 PM
IAD → SAN
United · UA 2768 / UA 1302
9h 42m1 stop
3h 16m in DEN
One ticket
85%arrive on time97% connections madeCheck fares
Aircraft and legroom reflect the planes each flight has flown recently. Airlines can swap planes and seat maps change, so check the airline’s seat map when you book.
IAD → SAN
Dulles to San Diego: 1,400 nonstop flights a year
On time (12 months)
84%
Cancelled
0.4%
avg delay 11 min
Best time to leave
9 AM to noon
96% on time vs 73% 6 to 9 PM
Most reliable airline
United
86% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines86%
1,040 flights · 87% on time as flown · 0.4% cancel
- Alaska Airlines75%
360 flights · 74% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
146 flights · avg delay 6 min
- 9 AM to noon96%
188 flights · avg delay 3 min
- Noon to 3 PM87%
364 flights · avg delay 8 min
- 3 to 6 PM79%
473 flights · avg delay 13 min
- 6 to 9 PM73%
229 flights · avg delay 20 min
Best day: Tuesday (86%). Worst: Thursday (82%).
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure