Seattle (SEA) to Salt Lake City (SLC) flights

Delta Air Lines, Alaska Airlines, SkyWest Airlines fly nonstop from Seattle-Tacoma International Airport to Salt Lake City International Airport, with about 93 flights a week in July 2026. The 689-mile flight takes about 2h 0m gate to gate.

From

SEA

Seattle

Seattle-Tacoma International Airport

SLC

Salt Lake City

Salt Lake City International Airport

Distance: 689 mi · 1,109 km
Flight time: 2h 0m
Airlines: 3
Seats filled: 81%

Flights a week, July 2026

4,143 flights and 549,136 passengers in 12 months

Map data: Natural Earth. Lines follow the shortest (great-circle) path.

Airlines flying SEA to SLC

Airline	Flights a week	Aircraft	Passengers (12 months)	Flight time
Delta Air Lines	47	Boeing 737-800, Boeing 737-900ER, Airbus A321	322,357	1h 59m
Alaska Airlines	39	Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800	186,687	2h 1m
SkyWest Airlines	7	Embraer E175	25,067	2h 1m
Frontier AirlinesSeasonal or ended	n/a	Airbus A321, Airbus A320neo	13,655	2h 6m
Horizon AirSeasonal or ended	n/a	Embraer E175	1,370	2h 3m

Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.

SEA to SLC flight schedule

17 flight numbers flew this route in August 2026, 8 of them almost daily. The first usually leaves at 5:45am and the last at 8:33pm. Times are local and can change; check with the airline before you book.

Flight	Departs	Arrives	Days flown in August 2026	On time (12 months)
DL 1128Delta Air Lines	5:45am	8:46am	31	94%
DL 2858Delta Air Lines	7:15am	10:26am	31	93%
AS 292Alaska Airlines	7:18am	10:27am	18	91%
AS 360Alaska Airlines	8:48am	11:55am	18	84%
AS 661Alaska Airlines	9:08am	12:14pm	13	69%
DL 1016Delta Air Lines	9:40am	12:46pm	31	90%
DL 1265Delta Air Lines	11:05am	2:11pm	31	85%
AS 733Alaska Airlines	11:51am	3:04pm	31	68%
DL 1120Delta Air Lines	1:25pm	4:35pm	31	83%
AS 3282Alaska Airlines · operated by SkyWest Airlines	2:15pm	5:27pm	9	n/a
AS 368Alaska Airlines	2:45pm	5:48pm	18	61%
AS 373Alaska Airlines	4:47pm	7:50pm	18	74%
AS 669Alaska Airlines	5:01pm	8:04pm	13	80%
DL 1165Delta Air Lines	6:09pm	9:17pm	31	80%
AS 3298Alaska Airlines · operated by SkyWest Airlines	7:07pm	10:14pm	31	79%
DL 1239Delta Air Lines	7:50pm	10:55pm	17	81%
AS 1459Alaska Airlines	8:33pm	11:36pm	10	39%

Is SEA to SLC on time?

From September 2025 to August 2026, 83% of 4,119 flights arrived within 15 minutes of schedule and 0.8% were cancelled. Flights leaving around 7am were the most punctual (94%), those around 11am the least (78%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (47%).

Airline	Flights	On time	Average delay	Cancelled
Delta Air Lines	2,232	87%	9 min	0.5%
Alaska Airlines	1,810	80%	9 min	1%
Frontier Airlines	77	73%	15 min	3.9%

Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.

On-time arrivals by departure time

Scheduled departure	Flights	On time
5am to 6am	365	94%
7am to 8am	388	94%
8am to 9am	189	89%
9am to 10am	430	88%
11am to 12pm	635	78%
1pm to 2pm	376	83%
2pm to 3pm	134	74%
3pm to 4pm	84	80%
4pm to 5pm	337	81%
5pm to 6pm	279	81%
6pm to 7pm	274	81%
7pm to 8pm	369	78%
8pm to 9pm	174	76%

Flights by month

Month	Flights	Passengers
August 2025	406	57,266
September 2025	399	51,248
October 2025	360	47,296
November 2025	299	36,866
December 2025	309	41,216
January 2026	302	38,667
February 2026	296	38,562
March 2026	327	42,879
April 2026	324	42,740
May 2026	350	44,197
June 2026	364	51,974
July 2026	411	56,857

Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.