Route on-time record
SLC to SEA: most on-time flights and the best time to fly
Salt Lake City (Salt Lake City International Airport) to Seattle (Seattle–Tacoma International Airport). 4,123 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was SkyWest 3295 at 7:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SLC → SEA
Salt Lake City to Seattle: 4,123 nonstop flights a year
On time (12 months)
79%
Cancelled
1.0%
avg delay 12 min
Best time to leave
Before 9 AM
92% on time vs 67% 6 to 9 PM
Most reliable airline
Delta
83% chance on time
Lowest nonstop fare seen in the next two months: $249 (Alaska 3344 on 2026-11-30). 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 · SkyWest 3295 · sold as United Express, Delta Connection, American Eagle or Alaska
7:15 AM → 8:40 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 97% of the time (30 flights, Jun 2025 to May 2026).
- Never cancelled in 30 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 67%).
- Short track record (30 flights), so its score leans on the airline's record at this hour.
Limited track record · 30 flights
Find 7:15 AM flight fares Opens this date on Aviasales#2 · Delta 2874
7:55 AM → 9:15 AM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.3%
- Avg arrival delay
- 5 min
- Arrived on time 92% of the time (364 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 67%).
Strong track record · 364 flights
Find Delta 2874 fares Opens this date on Aviasales#3 · SkyWest 3374 · sold as United Express, Delta Connection, American Eagle or Alaska
7:05 AM → 8:30 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-12. Same departure also flew as SkyWest 3344; its record covers all of them.
89%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 89% of the time (239 flights, Jun 2025 to May 2026).
- Never cancelled in 243 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 67%).
Strong track record · 239 flights
Find 7:05 AM flight fares Opens this date on Aviasales#4 · Delta 2998
10:45 PM → 12:03 AM2h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 89% of the time (277 flights, Jun 2025 to May 2026).
- Never cancelled in 277 scheduled flights.
Strong track record · 277 flights
Find Delta 2998 fares Opens this date on Aviasales#5 · Delta 2995
11:07 AM → 12:25 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.5%
- Avg arrival delay
- 8 min
- Arrived on time 89% of the time (363 flights, Jun 2025 to May 2026).
Strong track record · 363 flights
Find Delta 2995 fares Opens this date on Aviasales#6 · Delta 2921
1:40 PM → 2:54 PM2h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.7%
- Avg arrival delay
- 10 min
- Arrived on time 86% of the time (285 flights, Jun 2025 to May 2026).
Strong track record · 285 flights
Find Delta 2921 fares Opens this date on Aviasales#7 · Alaska 653
6:00 AM → 7:21 AM2h 21m nonstop
Local times, typical schedule. Last flown 2026-04-21.
83%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.9%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (112 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 67%).
Moderate track record · 112 flights
Find Alaska 653 fares Opens this date on Aviasales#8 · Alaska 796
11:06 AM → 12:26 PM2h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.2%
- Avg arrival delay
- 9 min
- Arrived on time 85% of the time (253 flights, Jun 2025 to May 2026).
Strong track record · 253 flights
Find Alaska 796 fares Opens this date on Aviasales#9 · Delta 871
5:10 PM → 6:30 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.6%
- Avg arrival delay
- 10 min
- Arrived on time 83% of the time (330 flights, Jun 2025 to May 2026).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 330 flights
Find Delta 871 fares Opens this date on Aviasales#10 · Alaska 678
6:12 PM → 7:30 PM2h 18m nonstop
Local times, typical schedule. Last flown 2026-03-17.
75%
chance on time
- On time (history)
- 82%
- Cancelled
- 3.9%
- Avg arrival delay
- 8 min
- Arrived on time 82% of the time (49 flights, Jun 2025 to May 2026).
- Cancelled 3.9% of the time (2 of 51).
- Leaves in this route's least on-time window (6 to 9 PM: 67% on time; Before 9 AM: 92%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 49 flights
Find Alaska 678 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines83%
2,222 flights · 83% on time as flown · 0.6% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)77%
439 flights · 75% on time as flown · 0.3% cancel
- Alaska Airlines73%
1,355 flights · 74% on time as flown · 1.8% cancel
- Frontier Airlines72%
107 flights · 69% on time as flown · 1.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
765 flights · avg delay 6 min
- 9 AM to noon77%
848 flights · avg delay 13 min
- Noon to 3 PM82%
560 flights · avg delay 11 min
- 3 to 6 PM76%
1,070 flights · avg delay 13 min
- 6 to 9 PM67%
493 flights · avg delay 17 min
- After 9 PM79%
387 flights · avg delay 11 min
Best day: Tuesday (85%). Worst: Sunday (78%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)40%
- Late-arriving aircraft31%
- Air traffic control and airport volume24%
- Severe weather5%
Share of delay minutes by the cause airlines report to the US DOT.
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
SLC to SEA questions
- What time of day is best to fly SLC to SEA?
- Before 9 AM: 92% of flights arrived on time, against 67% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SLC to SEA?
- Delta, with a season-adjusted 83% chance of operating and arriving on time over 2,222 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SLC to SEA?
- June (74% on time); the best was February (87%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SLC
- SEA to SLC (return)
- SLC to DEN 77%
- SLC to PHX 84%
- SLC to LAX 86%
- SLC to DFW 78%
- SLC to LAS 78%
- SLC to SFO 72%
- SLC to ORD 75%
- SLC to ATL 86%
- SLC to SAN 84%
- SLC to PDX 88%
- SLC to SMF 86%
- SLC to IAH 85%
Live status: FAA delays and ground stops