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Ranking & search details
3 nonstop, 37 with 1 connection, 6 with 2 · ranked by overall best · 4 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.
Fares seen on this date: nonstop from 212 · any route from 210 (recent searches, one way, per person; each card opens the live price)
42 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 72% reliability rating vs 61% for midday departures.
- Alaska trips we compared arrive on time 80% of the time on average, 2 points more often than American, Delta and United (77%).
- Legroom was comparable across the flights we compared (30–31 in), so it didn't set them apart.
8:30 AM3:51 PMDCA → SEA
American · AA 1966 / OO 5273
10h 21m1 stop
1h 19m in LAX
One ticket
82%arrive on time90% connections madeCheck fares
6:05 AM12:19 PMDCA → SEA
Delta · DL 1193 / DL 889
9h 19m1 stop
2h 43m in MSP
One ticket
82%arrive on time95% 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.
DCA → SEA
Washington to Seattle: 1,094 nonstop flights a year
On time (12 months)
73%
Cancelled
1.6%
avg delay 21 min
Best time to leave
Before 9 AM
80% on time vs 69% 3 to 6 PM
Most reliable airline
Alaska
75% chance on time
Lowest nonstop fare seen in the next two months: $212 (Alaska 3 on 2026-11-25). 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.
- Alaska Airlines75%
729 flights · 76% on time as flown · 1.2% cancel
- Delta Air Lines65%
365 flights · 66% on time as flown · 2.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM80%
365 flights · avg delay 10 min
- 3 to 6 PM69%
729 flights · avg delay 26 min
Best day: Saturday (85%). Worst: Thursday (75%).
Smarter routing
Nearby airports that run more on time
IAD → SEA 75% chance on time
Washington Dulles International Airport to Seattle–Tacoma International Airport · 1,926 flights a year · 23 mi from your airports · yours: 72%
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