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 | $185 (Kiwi.com) |
One-way from | $62 (Trip.com) |
Popular in | June |
Cheapest in | September |
Average price | $314 |
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
Sat 12/13
4:35 pm-11:21 pm
1 stop5h 46m
Denver Intl
Mon 12/15
6:05 am-12:56 pm
1 stop7h 51m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Sun 1/11
11:00 am-12:38 pm
1 stop24h 38m
Denver Intl
Thu 1/15
7:00 am-5:08 pm
1 stop11h 08m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Tue 1/20
6:15 am-11:35 pm
1 stop16h 20m
Denver Intl
Sat 1/24
12:34 pm-5:34 pm
1 stop6h 00m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 2/4
9:05 am-11:35 pm
1 stop13h 30m
Denver Intl
Sat 2/7
12:34 pm-10:35 pm
1 stop11h 01m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Thu 3/5
2:20 pm-11:25 pm
1 stop8h 05m
Denver Intl
Sun 3/8
6:30 am-2:52 pm
1 stop9h 22m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Mon 1/5
2:25 pm-11:25 pm
1 stop8h 00m
Denver Intl
Thu 1/8
7:00 am-5:40 pm
2 stops11h 40m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 1/28
3:36 pm-10:53 am
2 stops18h 17m
Denver Intl
Mon 2/2
7:39 pm-12:09 pm
1 stop17h 30m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 1/16
9:15 am-11:25 pm
2 stops13h 10m
Denver Intl
Sat 1/24
1:30 pm-8:05 pm
1 stop7h 35m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Mon 1/5
2:25 pm-11:25 pm
1 stop8h 00m
Denver Intl
Fri 1/9
12:49 pm-10:07 pm
2 stops10h 18m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Fri 1/2
7:00 am-11:59 pm
1 stop15h 59m
Denver Intl
Mon 1/5
6:48 pm-11:11 am
1 stop17h 23m
| 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 Thursday at noon 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.
Crew
Food
Overall
Comfort
Boarding
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Food
Overall
Comfort
Boarding
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Food
Overall
Comfort
Boarding
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Food
Overall
Comfort
Boarding
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Food
Overall
Comfort
Boarding
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Food
Overall
Comfort
Boarding
Entertainment
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% |