Frontier’s UpFront Plus guarantees an empty middle seat for extra comfort.
Frontier offers no in-flight entertainment or Wi-Fi; bring a book or pre-load devices.

Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $78 (Frontier) |
One-way from | $39 (Kiwi.com) |
Popular in | April |
Cheapest in | October |
Average price | $290 |
Good round-trip deal | $114 or less |
Good one-way deal | $49 or less |
Fly from
Fly to
Route
Depart
Return
Price
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 1/29
7:40 pm-11:25 pm
Nonstop2h 45m
Denver Intl
Sat 1/31
6:50 pm-9:10 pm
Nonstop3h 20m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 12/16
7:35 pm-11:21 pm
Nonstop2h 46m
Denver Intl
Mon 1/12
6:23 pm-11:22 pm
1 stop5h 59m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sun 1/4
7:35 pm-11:23 pm
Nonstop2h 48m
Denver Intl
Wed 1/7
6:23 pm-11:22 pm
1 stop5h 59m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 3/5
5:30 am-12:00 pm
1 stop5h 30m
Denver Intl
Sun 3/8
6:30 am-8:36 am
Nonstop3h 06m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 1/3
7:30 am-11:22 am
Nonstop2h 52m
Denver Intl
Sat 1/10
12:42 pm-4:40 pm
1 stop4h 58m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 1/23
7:40 pm-11:25 pm
Nonstop2h 45m
Denver Intl
Mon 1/26
6:23 pm-12:09 am
1 stop6h 46m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 1/2
6:52 pm-10:32 pm
Nonstop2h 40m
Denver Intl
Mon 1/5
6:02 am-8:10 am
Nonstop3h 08m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 2/23
3:40 pm-11:59 pm
1 stop7h 19m
Denver Intl
Wed 2/25
7:00 am-9:10 am
Nonstop3h 10m
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 2/5
5:00 am-11:51 am
1 stop5h 51m
Denver Intl
Sun 2/8
3:45 pm-10:22 pm
1 stop7h 37m
ChicagoDenver
ORD - DEN
ORDDEN
Chicago O'Hare Intl
Fri 1/9
2:36 pm-4:34 pm
Nonstop2h 58m
Denver Intl
Sun 1/11
6:00 am-9:44 am
Nonstop2h 44m
Currently, March is the cheapest month in which you can book a flight from USA to Denver (average of $36). Flying from USA to Denver in July is currently the most expensive (average of $96). 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.
Unlike in the afternoon, when flights are generally more expensive, you can save up to 22% on flights from USA to Denver by exploring options for tickets in the evening.
Travelers seeking maximum savings on their USA to Denver flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from US0 to DEN are scheduled on a Friday (91 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (9 on average).
About 16% of weekly flights between United States and Denver have experienced delays in the past year, with the average delay time being 143 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.
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, British Airways have had the lowest number of delays on this route, with no flights being classified as delayed.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Mike,Aug 2025
OKC - AUS
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$193 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$100 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$115 | Average$318 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$127 | Average$310 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$130 | Average$316 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$131 | Average$342 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$137 | Average$286 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$316 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$255 | Average$331 | FlexibilityNo cancel fee | On-time75% |