San Diego (SAN) to Denver (DEN) flights

Southwest Airlines, United Airlines, Alaska Airlines, Frontier Airlines, SkyWest Airlines fly nonstop from San Diego International Airport to Denver International Airport, with about 121 flights a week in July 2026. The 853-mile flight takes about 2h 21m gate to gate.

From

SAN

San Diego

San Diego International Airport

DEN

Denver

Denver International Airport

Distance: 853 mi · 1,373 km
Flight time: 2h 21m
Airlines: 5
Seats filled: 80%

Flights a week, July 2026

5,976 flights and 819,681 passengers in 12 months

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

Airlines flying SAN to DEN

Airline	Flights a week	Aircraft	Passengers (12 months)	Flight time
Southwest Airlines	47	Boeing 737 MAX 8, Boeing 737-700 / MAX 7, Boeing 737-800	312,121	2h 15m
United Airlines	39	Airbus A321, Boeing 737-900ER, Boeing 737 MAX 9	317,169	2h 24m
Alaska Airlines	14	Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737-800	51,016	2h 24m
Frontier Airlines	14	Airbus A320neo, Airbus A321, Airbus A320-100/200	120,157	2h 27m
SkyWest Airlines	6	Embraer E175	19,218	2h 29m

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

SAN to DEN flight schedule

32 flight numbers flew this route in August 2026, 10 of them almost daily. The first usually leaves at 6:20am and the last at 8:27pm. 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)
WN 3274Southwest Airlines	6:20am	9:50am	4	n/a
F9 2818Frontier Airlines	6:25am	10:03am	31	86%
UA 2045United Airlines	6:30am	10:06am	21	100%
UA 2368United Airlines	6:35am	10:08am	10	94%
WN 1912Southwest Airlines	6:35am	10:05am	20	75%
WN 3411Southwest Airlines	6:45am	10:10am	12	92%
AS 1618Alaska Airlines	7:00am	10:33am	18	97%
UA 2476United Airlines	8:45am	12:17pm	31	89%
AS 1422Alaska Airlines	8:48am	12:20pm	13	77%
WN 330Southwest Airlines	9:00am	12:25pm	12	92%
WN 3412Southwest Airlines	9:35am	1:00pm	8	n/a
WN 1445Southwest Airlines	10:10am	1:30pm	12	67%
UA 1715United Airlines	10:55am	2:27pm	10	92%
UA 2793United Airlines	11:00am	2:32pm	21	76%
WN 4890Southwest Airlines	11:05am	2:30pm	20	85%
WN 1991Southwest Airlines	11:45am	3:10pm	8	n/a
UA 1565United Airlines	12:33pm	4:06pm	31	84%
WN 4839Southwest Airlines	12:50pm	4:15pm	4	n/a
WN 4139Southwest Airlines	12:55pm	4:15pm	4	n/a
WN 1435Southwest Airlines	1:40pm	5:05pm	8	n/a
WN 2059Southwest Airlines	1:50pm	5:15pm	12	0%
WN 5071Southwest Airlines	2:55pm	6:15pm	12	17%
WN 3414Southwest Airlines	3:15pm	6:40pm	12	42%
AS 3012Alaska Airlines · operated by SkyWest Airlines	3:45pm	7:18pm	18	34%
F9 4990Frontier Airlines	3:45pm	7:20pm	31	77%
AS 3029Alaska Airlines · operated by SkyWest Airlines	3:51pm	7:26pm	13	74%
UA 682United Airlines	4:07pm	7:36pm	31	74%
WN 3415Southwest Airlines	4:50pm	8:15pm	20	44%
UA 519United Airlines	6:55pm	10:24pm	19	86%
WN 824Southwest Airlines	7:50pm	11:10pm	12	25%
AS 1619Alaska Airlines	8:01pm	11:30pm	18	87%
AS 1423Alaska Airlines	8:27pm	11:56pm	13	62%

Is SAN to DEN on time?

From September 2025 to August 2026, 78% of 6,134 flights arrived within 15 minutes of schedule and 1% were cancelled. Flights leaving around 6am were the most punctual (90%), those around 3pm the least (54%). Most delay time was caused by late-arriving aircraft (48%).

Airline	Flights	On time	Average delay	Cancelled
Southwest Airlines	2,404	71%	18 min	0.7%
United Airlines	2,067	86%	11 min	0.6%
Alaska Airlines	961	79%	12 min	2%
Frontier Airlines	702	81%	17 min	2%

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
6am to 7am	971	90%
7am to 8am	306	89%
8am to 9am	563	89%
9am to 10am	330	90%
10am to 11am	373	83%
11am to 12pm	419	87%
12pm to 1pm	502	78%
1pm to 2pm	301	59%
2pm to 3pm	264	57%
3pm to 4pm	369	54%
4pm to 5pm	551	68%
5pm to 6pm	128	61%
6pm to 7pm	274	83%
7pm to 8pm	286	65%
8pm to 9pm	413	81%

Flights by month

Month	Flights	Passengers
August 2025	432	67,779
September 2025	409	62,308
October 2025	529	70,539
November 2025	518	65,300
December 2025	531	65,835
January 2026	495	60,593
February 2026	461	62,842
March 2026	533	78,456
April 2026	505	69,865
May 2026	513	68,387
June 2026	519	74,209
July 2026	534	74,107

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