Frontier's UpFront Plus seats guarantee an empty middle seat for extra comfort.
Early check-in helps secure your place as Frontier often overbooks flights.

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $166 (Orbitz) |
One-way from | $53 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $268 |
Good round-trip deal | $288 or less |
Good one-way deal | $167 or less |
Fly from
Fly to
Route
Depart
Return
Price
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 12/5
8:00 am-11:59 pm
1 stop14h 59m
Denver Intl
Mon 12/8
6:00 am-10:59 pm
1 stop17h 59m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 12/3
12:35 pm-11:59 pm
1 stop10h 24m
Denver Intl
Wed 12/10
6:45 am-2:23 pm
2 stops8h 38m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Thu 12/4
11:40 am-10:44 pm
2 stops10h 04m
Denver Intl
Mon 12/8
5:30 am-12:56 pm
2 stops8h 26m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 12/5
11:40 am-10:44 pm
2 stops10h 04m
Denver Intl
Mon 12/8
5:30 am-12:56 pm
2 stops8h 26m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 12/5
8:00 am-11:59 pm
1 stop14h 59m
Denver Intl
Sun 12/7
6:00 am-1:50 pm
1 stop8h 50m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 1/9
7:00 am-11:58 pm
1 stop15h 58m
Denver Intl
Sun 1/11
7:39 pm-9:47 am
1 stop15h 08m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Mon 11/24
5:59 pm-11:59 pm
1 stop5h 00m
Denver Intl
Fri 12/5
8:20 pm-10:14 am
1 stop14h 54m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 12/3
7:15 am-6:58 pm
2 stops10h 43m
Denver Intl
Wed 12/10
7:05 am-6:56 pm
2 stops12h 51m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 1/14
1:59 pm-11:35 pm
2 stops8h 36m
Denver Intl
Mon 1/19
7:00 am-1:00 pm
1 stop7h 00m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 1/30
7:45 am-4:13 pm
2 stops7h 28m
Denver Intl
Sun 2/1
12:34 pm-5:34 pm
1 stop6h 00m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars |
The best time to book flights from San Jose, California to Denver is 83 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, March is the cheapest month in which you can book a flight from San Jose, California to Denver (average of $41). Flying from San Jose, California to Denver in June is currently the most expensive (average of $106). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
One of the essential ways to save on airfare from San Jose, California to Denver is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 19% on airfare.
Travelers seeking maximum savings on their San Jose, California to Denver flight should consider departing on Wednesday evenings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Comfort
Food
Crew
Boarding
Entertainment
Overall
Reviews
Walter,Aug 2025
OAK - SAN
Comfort
Food
Crew
Boarding
Entertainment
Overall
Reviews
Walter,Aug 2025
OAK - SAN
Comfort
Food
Crew
Boarding
Entertainment
Overall
Reviews
Walter,Aug 2025
OAK - SAN
Comfort
Food
Crew
Boarding
Entertainment
Overall
Reviews
Walter,Aug 2025
OAK - SAN
Comfort
Food
Crew
Boarding
Entertainment
Overall
Reviews
Walter,Aug 2025
OAK - SAN
Comfort
Food
Crew
Boarding
Entertainment
Overall
Reviews
Walter,Aug 2025
OAK - SAN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$63 | Average$182 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$216 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$178 | Average$357 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$198 | Average$337 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$211 | Average$251 | FlexibilityNo cancel fee | On-time71% |