Cheap flights from San Francisco to Denver from $187 SFO → DEN
San Francisco International Airport (SFO) → Denver International Airport (DEN)
The cheapest return found recently is $222 with Frontier Airlines, 24 Dec – 29 Dec, found 2 days ago. The cheapest one-way found recently is $187 with Alaska Airlines, 1 Oct 2027, found 6 days ago.
- Cheapest one-way found recently
- $187, found 6 days ago
- Cheapest return found recently
- $222, 24 Dec to 29 Dec
- Usual return price
- $158 to $279
- Cheapest month to fly
- December 2026, return fares from $96 found in the last 7 days
- Airlines with nonstop flights
- Frontier Airlines, United Airlines, Southwest Airlines
Return
The cheapest return fare on each of 3 departure dates is usually $158 to $279.
Cheapest return found recently
$222
24 Dec – 29 Dec · Frontier Airlines
San Francisco International Airport (SFO) → Denver International Airport (DEN)
Leaves 10:21 p.m. · Return leaves 8:35 a.m. · 13 h 3 min of travel, both ways together
out 1 stop, back nonstop · via Los Angeles International Airport (LAX) · overnight connection · 6 h connection
found 2 days ago
Cheapest nonstop return
$227
24 Dec – 29 Dec · Frontier Airlines
San Francisco International Airport (SFO) → Denver International Airport (DEN)
Leaves 6:15 a.m. · Return leaves 11:28 a.m. · 5 h 33 min of travel, both ways together
out nonstop, back nonstop
found 2 days ago
Found recently, and the cheapest we hold
$222 24 Dec – 29 Decfound 2 days agoSee prices for these dates
$96 5 Dec – 11 Decfound 7 days agoSee prices for these dates
What have prices looked like?
Over 45 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $92 to $539.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 3 departure dates from 27 Nov to 24 Dec, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 5-night return fares leaving within 3 days of 24 Dec to compare.
Every date we hold
55 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 27 Nov – 29 Nov | $337 | Frontier Airlines | San Francisco International Airport (SFO) → Denver International Airport (DEN) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 5 Dec – 11 Dec | $96 | Frontier Airlines | San Francisco International Airport (SFO) → Denver International Airport (DEN) | out nonstop, back nonstop | found 7 days ago | See prices for these dates |
| 24 Dec – 29 Dec | $220 | Alaska Airlines | San Francisco International Airport (SFO) → Denver International Airport (DEN) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $96.
Airlines on the cheapest dates: Frontier Airlines, Alaska Airlines.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$187
1 Oct 2027 · Alaska Airlines
San Francisco International Airport (SFO) → Denver International Airport (DEN)
Leaves 3:04 p.m. · 5 h 25 min trip
1 stop
found 6 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$187 1 Oct 2027found 6 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 38 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $45 to $249.
Those were the prices on those days, not today's.
Is this a good one-way price?
Not enough comparable prices yet: we hold one-way fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 1 Oct 2027 to compare.
Every date we hold
1 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 1 Oct 2027 | $187 | Alaska Airlines | San Francisco International Airport (SFO) → Denver International Airport (DEN) | 1 stop | found 6 days ago | Open this trip |
Airlines on the cheapest dates: Alaska Airlines.
Premium cabin fares from San Francisco to Denver
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 24 Dec – 29 Dec in another cabin: Premium economy · Business · First
Today's prices for 1 Oct 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Francisco to Denver?
Return
Fares 14 to 29 days before departure were typically 48% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (45 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $259 | $232 | +92% | 19 |
| 7–13 days | $232 | $180 | +72% | 10 |
| 14–29 days | $135 | $96 | Cheapest seen | 21 |
| 30–59 days | $135 | $92 | +0% | 14 |
| 90–179 days | $140 | $119 | +4% | 21 |
| 180+ days | $539 | $539 | +299% | 8 |
One-way
Fares 90 to 179 days before departure were typically 39% lower than 30 to 59 days before departure.
From the cheapest one-way each day between 24 Sept and 11 Nov (38 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 30–59 days | $74 | $74 | +64% | 8 |
| 60–89 days | $60 | $60 | +33% | 7 |
| 90–179 days | $45 | $45 | Cheapest seen | 11 |
| 180+ days | $249 | $187 | +453% | 14 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
San Jose → Denver
67 km from San Francisco
$231
$9 more than flying from San Francisco
24 Dec – 29 Dec · SJC → DEN · out nonstop, back 1 stop
found 2 days ago
Oakland → Denver
13 km from San Francisco
$271
$49 more than flying from San Francisco
24 Dec – 29 Dec · OAK → DEN · out 1 stop, back 1 stop
found 2 days ago
San Francisco → Colorado Springs
102 km from Denver
$416
$194 more than flying to Denver
9 Dec – 13 Dec · SFO → COS · out 1 stop, back 1 stop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Oakland → Denver
13 km from San Francisco
$229
$42 more than flying from San Francisco
1 Oct 2027 · OAK → DEN · 1 stop
found 6 days ago
San Jose → Denver
67 km from San Francisco
$283
$96 more than flying from San Francisco
1 Oct 2027 · SJC → DEN · nonstop
found 6 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 24 Dec – 29 Dec. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from San Francisco to Denver?
The cheapest return found recently is $222 with Frontier Airlines, 24 Dec to 29 Dec, found 2 days ago. The cheapest return we hold, of any age, is $96 with Frontier Airlines, 5 Dec to 11 Dec, found 7 days ago. The cheapest return fare on each of 3 departure dates is usually $158 to $279.
How much is a one-way flight from San Francisco to Denver?
The cheapest one-way found recently is $187 with Alaska Airlines, 1 Oct 2027, found 6 days ago.
What is the cheapest month to fly from San Francisco to Denver?
December 2026 is the cheapest month for a return, from $96, 5 Dec to 11 Dec, found 7 days ago.
How far ahead should I book a flight from San Francisco to Denver?
In 45 days of prices between 24 Sept and 11 Nov, return fares 14 to 29 days before departure were typically 48% lower than 0 to 6 days before departure. In 38 days of prices between 24 Sept and 11 Nov, one-way fares 90 to 179 days before departure were typically 39% lower than 30 to 59 days before departure.
Is there a direct flight from San Francisco to Denver?
Yes, the cheapest nonstop return found recently is $227 with Frontier Airlines, 24 Dec to 29 Dec, found 2 days ago.
How long is the flight from San Francisco to Denver?
The cheapest one-way found recently, with Alaska Airlines on 1 Oct 2027, takes 5 h 25 min with 1 stop.
Which airlines have the cheapest flights from San Francisco to Denver?
Between 27 Nov and 24 Dec, Frontier Airlines has the cheapest return on 2 of the 3 departure dates we hold, and Alaska Airlines on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work