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 | $128 (Kiwi.com) |
One-way from | $62 (Trip.com) |
Popular in | November |
Cheapest in | September |
Average price | $267 |
Good round-trip deal | $396 or less |
Good one-way deal | $207 or less |
Fly from
Fly to
Route
Depart
Return
Price
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Tue 2/17
8:05 pm-11:38 am
1 stop14h 33m
Denver Intl
Mon 2/23
6:45 pm-9:47 am
1 stop16h 02m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 1/28
12:46 pm-11:58 pm
1 stop10h 12m
Denver Intl
Fri 1/30
7:39 pm-10:35 pm
1 stop27h 56m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Tue 1/27
7:52 pm-11:38 am
1 stop14h 46m
Denver Intl
Sun 2/1
7:39 pm-5:34 pm
1 stop22h 55m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Mon 1/26
6:02 pm-11:35 pm
1 stop28h 33m
Denver Intl
Thu 1/29
7:39 pm-10:35 pm
1 stop27h 56m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 2/11
7:45 am-5:34 pm
1 stop8h 49m
Denver Intl
Sun 2/15
6:40 am-1:37 pm
1 stop7h 57m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Tue 2/10
7:45 am-8:07 pm
2 stops11h 22m
Denver Intl
Tue 2/17
6:40 am-1:37 pm
1 stop7h 57m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 1/28
7:00 am-5:34 pm
2 stops9h 34m
Denver Intl
Sat 1/31
6:29 am-1:34 pm
1 stop8h 05m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Thu 2/26
7:15 am-5:27 pm
1 stop9h 12m
Denver Intl
Tue 3/3
12:50 pm-10:05 pm
2 stops10h 15m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 1/28
1:20 pm-11:25 pm
2 stops9h 05m
Denver Intl
Tue 2/3
6:29 am-2:53 pm
2 stops9h 24m
San JoseDenver
SJC - DEN
SJCDEN
San Jose
Wed 2/11
7:45 am-11:35 pm
2 stops14h 50m
Denver Intl
Sat 2/14
7:40 am-5:33 pm
1 stop10h 53m
| 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 84 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 $40). 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 in the afternoon could potentially save you up to 10% 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 at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Entertainment
Food
Comfort
Crew
Overall
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Comfort
Crew
Overall
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Comfort
Crew
Overall
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Comfort
Crew
Overall
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Comfort
Crew
Overall
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Food
Comfort
Crew
Overall
Boarding
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$63 | Average$178 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$216 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$181 | Average$362 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$208 | Average$350 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$211 | Average$251 | FlexibilityNo cancel fee | On-time71% |