Frontier's UpFront Plus seats guarantee an empty middle seat for added comfort.
Frontier offers Zone 1 boarding with a carry-on bag purchase or special fare bundle.

Round-trip from | $81 (CheapOair) |
|---|---|
One-way from | $60 (CheapOair) |
Popular in | December |
Cheapest in | January |
Average price | $136 |
Fly from
Fly to
Route
Depart
Return
Price
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Wed 1/28
4:08 pm-5:53 pm
Nonstop2h 45m
Denver Intl
Tue 2/3
6:32 pm-9:57 pm
1 stop26h 25m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Fri 1/30
2:43 pm-8:20 pm
1 stop6h 37m
Denver Intl
Sun 2/1
6:20 am-9:56 am
Nonstop2h 36m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Fri 1/30
2:43 pm-12:27 am
1 stop10h 44m
Denver Intl
Mon 2/2
9:00 pm-12:33 am
Nonstop2h 33m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Wed 1/28
4:08 pm-5:53 pm
Nonstop2h 45m
Denver Intl
Sat 1/31
6:00 am-10:51 pm
1 stop15h 51m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Wed 1/28
4:08 pm-5:53 pm
Nonstop2h 45m
Denver Intl
Sat 1/31
6:00 am-8:23 pm
2 stops13h 23m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Wed 1/28
9:33 pm-11:31 pm
2 stops26h 58m
Denver Intl
Tue 2/3
11:40 am-3:13 pm
Nonstop2h 33m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Sun 2/15
6:39 am-8:20 am
Nonstop2h 41m
Denver Intl
Thu 2/19
10:29 pm-8:51 pm
2 stops45h 22m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Thu 3/12
6:45 am-8:26 am
Nonstop2h 41m
Denver Intl
Sun 3/15
10:30 pm-12:05 pm
1 stop12h 35m
HoustonDenver
HOU - DEN
HOUDEN
Houston Hobby
Wed 2/25
9:05 pm-10:40 pm
Nonstop2h 35m
Denver Intl
Sat 2/28
5:50 am-9:30 am
Nonstop2h 40m
HoustonDenver
IAH - DEN
IAHDEN
Houston George Bush Intcntl
Wed 2/25
9:55 pm-11:35 pm
Nonstop2h 40m
Denver Intl
Sat 2/28
7:20 pm-10:46 pm
Nonstop2h 26m
The best time to book flights from Houston to Denver is 59 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, January is the cheapest month in which you can book a flight from Houston to Denver (average of $33). Flying from Houston to Denver in July is currently the most expensive (average of $103). 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.
A simple way to save on the total cost of your ticket is to fly from Houston to Denver in the evening. If you’re flexible enough to do this you can expect to save up to 23% on your trip compared to booking a flight in the afternoon.
Travelers seeking maximum savings on their Houston to Denver flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
About 16% of weekly flights between Houston and Denver have experienced delays in the past year, with the average delay time being 140 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Frontier have had the lowest number of delays on this route, with just 14% of flights being delayed.
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$164 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$108 | Average$306 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$165 | Average$313 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$167 | Average$272 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$419 | FlexibilityNo cancel fee | On-time71% |