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.
IAD → TPA
Dulles to Tampa: 1,412 nonstop flights a year
On time (12 months)
79%
Cancelled
1.1%
avg delay 16 min
Best time to leave
9 AM to noon
93% on time vs 64% 3 to 6 PM
Most reliable airline
United
81% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 683
9:00 AM → 11:33 AM2h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2641; its record covers all of them.
89%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.5%
- Avg arrival delay
- 7 min
- Arrived on time 90% of the time (368 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 93% on time; 3 to 6 PM: 64%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Strong track record · 368 flights
Find United 683 fares Opens this date on Aviasales#2 · United 2277
12:50 PM → 3:23 PM2h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 9 min
- Arrived on time 88% of the time (349 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Lands inside TPA's trouble window: 76% of its 25 ground stops and delay programs started between noon and 6 PM.
Strong track record · 349 flights
Find United 2277 fares Opens this date on Aviasales#3 · United 1140
6:36 PM → 9:11 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
69%
chance on time
- On time (history)
- 70%
- Cancelled
- 0.3%
- Avg arrival delay
- 21 min
- Arrived on time 70% of the time (325 flights, Jun 2025 to May 2026).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 325 flights
Find United 1140 fares Opens this date on Aviasales#4 · Frontier 2953
2:39 PM → 5:14 PM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
65%
chance on time
- On time (history)
- 65%
- Cancelled
- 5.3%
- Avg arrival delay
- 28 min
- Arrived on time 65% of the time (160 flights, Jun 2025 to May 2026).
- Cancelled 5.3% of the time (9 of 169).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside TPA's trouble window: 76% of its 25 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 160 flights
Find Frontier 2953 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines81%
1,221 flights · 81% on time as flown · 0.5% cancel
- Frontier Airlines69%
191 flights · 67% on time as flown · 3.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM88%
253 flights · avg delay 8 min
- 9 AM to noon93%
149 flights · avg delay 5 min
- Noon to 3 PM88%
385 flights · avg delay 10 min
- 3 to 6 PM64%
347 flights · avg delay 26 min
- 6 to 9 PM66%
167 flights · avg delay 29 min
- After 9 PM78%
111 flights · avg delay 20 min
Best day: Tuesday (86%). Worst: Sunday (77%).
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