ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
DCA → IAH
Washington to Houston: 3,113 nonstop flights a year
On time (12 months)
81%
Cancelled
1.9%
avg delay 16 min
Best time to leave
Before 9 AM
91% on time vs 62% 3 to 6 PM
Most reliable airline
United
83% chance on time
Lowest nonstop fare seen in the next two months: $304 (American 5278 on 2026-11-03). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Best trips
12 nonstop, 28 with 1 connection. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.
Best overall#1 · Nonstop · 3h 31m
6:00 AM → 8:31 AM
91%
arrive on time
93% on time · 1.6% cancel6:00 AM DCA → 8:31 AM IAH3h 31m
United 1450
Boeing 737 MAX 8 or 737-700 · 2–28 yrs oldFind United 1450 fares Opens this date on Aviasales#2 · Nonstop · 3h 38m
8:30 AM → 11:08 AM
91%
arrive on time
93% on time · 1.8% cancel8:30 AM DCA → 11:08 AM IAH3h 38m
United 697
Airbus A320 or A319 · 20–28 yrs oldFind United 697 fares Opens this date on Aviasales#3 · Nonstop · 3h 35m
12:40 PM → 3:15 PM
90%
arrive on time
90% on time · 0.6% cancel12:40 PM DCA → 3:15 PM IAH3h 35m
United 382
Airbus A319 or A320 · 18–29 yrs oldFind United 382 fares Opens this date on Aviasales#4 · Nonstop · 3h 32m
11:05 AM → 1:37 PM
87%
arrive on time
88% on time · 1.0% cancel11:05 AM DCA → 1:37 PM IAH3h 32m
United 2190
Boeing 737-800 or 737-700 · 16–28 yrs oldFind United 2190 fares Opens this date on Aviasales#5 · Nonstop · 3h 35m
2:33 PM → 5:08 PM
80%
arrive on time
80% on time · 0.7% cancel2:33 PM DCA → 5:08 PM IAH3h 35m
United 1381
Airbus A320 · 3–28 yrs oldFind United 1381 fares Opens this date on Aviasales#6 · Nonstop · 3h 37m
6:00 AM → 8:37 AM
79%
arrive on time
81% on time · 2.5% cancel6:00 AM DCA → 8:37 AM IAH3h 37m
PSA 5599 · sold as American Eagle
Bombardier CRJ900 · 7–12 yrs oldFind 6:00 AM flight fares Opens this date on Aviasales#7 · Nonstop · 3h 35m
7:59 PM → 10:34 PM
79%
arrive on time
79% on time · 0.7% cancel7:59 PM DCA → 10:34 PM IAH3h 35m
United 1678
Airbus A319 or A320 · 21–29 yrs oldFind United 1678 fares Opens this date on Aviasales#8 · Nonstop · 3h 42m
6:30 AM → 9:12 AM
78%
arrive on time
82% on time · 4.1% cancel6:30 AM DCA → 9:12 AM IAH3h 42m
PSA 5224 · sold as American Eagle
Bombardier CRJ900 · 7–12 yrs oldFind 6:30 AM flight fares Opens this date on Aviasales#9 · 1 connection · 6h 55m · one ticket (United)
2:55 PM → 8:50 PM
96%
connections made
81%
arrive on time
77% on time · 0.9% cancel2:55 PM DCA → 4:52 PM MSY2h 57m
Republic 4421 · sold as United Express
Embraer E175 · 12–19 yrs oldConnect in MSY · 2h 31m · 97% chance to make it · same ticket: the airline rebooks you if you miss it84% on time · 0.3% cancel7:23 PM MSY → 8:50 PM IAH1h 27m
United 2228
Airbus A320 · 24–29 yrs oldFind this United trip Look for Republic 4421 + United 2228 on Aviasales#10 · 1 connection · 5h 13m · one ticket (American)
5:00 AM → 9:13 AM
86%
connections made
76%
arrive on time
92% on time · 3.5% cancel5:00 AM DCA → 6:22 AM CLT1h 22m
American 365 · also flew as 1686, 2882
Airbus A319 · 21–27 yrs oldConnect in CLT · 1h 00m · 90% chance to make it · same ticket: the airline rebooks you if you miss it88% on time · 1.5% cancel7:22 AM CLT → 9:13 AM IAH2h 51m
American 2134 · also flew as 2445
Boeing 737 MAX 8 or 737-800 · 1–25 yrs oldFind this American trip Look for American 365 + American 2134 on Aviasales
Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines83%
2,408 flights · 83% on time as flown · 1.1% cancel
- PSA Airlines (sold as American Eagle)72%
194 flights · 70% on time as flown · 3.2% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)70%
511 flights · 76% on time as flown · 4.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
921 flights · avg delay 6 min
- 9 AM to noon87%
369 flights · avg delay 11 min
- Noon to 3 PM81%
914 flights · avg delay 16 min
- 3 to 6 PM62%
352 flights · avg delay 37 min
- 6 to 9 PM75%
557 flights · avg delay 24 min
Best day: Saturday (87%). Worst: Friday (80%).
Smarter routing
Nearby airports that run more on time
IAD → IAH 82% chance on time
Washington Dulles International Airport to George Bush Intercontinental Airport · 1,865 flights a year · 23 mi from your airports · yours: 80%
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