Denver to Seattle DEN → SEA
Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA)
The cheapest return found recently is $163 with Frontier Airlines, 25 Dec – 2 Jan 2027, found yesterday. The cheapest one-way found recently is $74 with Frontier Airlines, 7 Nov, found 5 days ago.
Return
The cheapest return fare on each of 7 departure dates is usually $214 to $300.
Cheapest return found recently
$163
25 Dec – 2 Jan 2027 · Frontier Airlines
Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA)
Leaves 10:08 a.m. · Return leaves 1:37 p.m. · 6 h 3 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Cheapest nonstop return
$163
25 Dec – 2 Jan 2027 · Frontier Airlines
Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA)
Leaves 10:08 a.m. · Return leaves 1:37 p.m. · 6 h 3 min of travel, both ways together
out nonstop, back nonstop
found yesterday
Found recently, and the cheapest we hold
$163 25 Dec – 2 Jan 2027found yesterdaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 22 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $163 to $374.
At $163, the cheapest return found recently is at the low end of that range.
22 days is a short history, so treat this range as an early guide.
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 7 departure dates from 20 Oct to 25 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 8-night return fares leaving within 3 days of 25 Dec to compare.
Every date we hold
7 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Oct – 31 Oct | $300 | Alaska Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 23 Oct – 28 Oct | $300 | Alaska Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 27 Oct – 1 Nov | $260 | Alaska Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 29 Oct – 2 Nov | $260 | Alaska Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 6 Nov – 7 Nov | $168 | Frontier Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
| 25 Nov – 29 Nov | $310 | Alaska Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 6 days ago | See prices for these dates |
| 25 Dec – 2 Jan 2027 | $163 | Frontier Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found yesterday | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $163.
Airlines on the cheapest dates: Alaska Airlines, Frontier Airlines.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $77 to $95.
Cheapest one-way found recently
$74
7 Nov · Frontier Airlines
Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA)
Leaves 9:17 a.m. · 10 h 16 min trip
1 stop
found 5 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$74 7 Novfound 5 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $74 to $132.
At $74, the cheapest one-way found recently is at the low end of that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 5 Nov to 7 Nov, 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?
No. We hold one-way fares on 2 other departure dates within 3 days of 7 Nov, and none is cheaper.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 5 Nov | $109 | Frontier Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 5 days ago | Open this trip |
| 6 Nov | $80 | Frontier Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 5 days ago | Open this trip |
| 7 Nov | $74 | Frontier Airlines | Denver International Airport (DEN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 5 days ago | Open this trip |
Airlines on the cheapest dates: Frontier Airlines.
Premium cabin fares from Denver to Seattle
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 25 Dec – 2 Jan 2027 in another cabin: Premium economy · Business · First
Today's prices for 7 Nov in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Denver to Seattle?
Return
Fares 14 to 29 days before departure were typically 46% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (22 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 | $373 | $300 | +86% | 13 |
| 7–13 days | $260 | $260 | +29% | 9 |
| 14–29 days | $201 | $168 | Cheapest seen | 8 |
| 30–59 days | $310 | $168 | +54% | 9 |
One-way
The cheapest fares were 14 to 29 days before departure.
From the cheapest one-way each day between 24 Sept and 18 Oct (25 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 |
|---|---|---|---|---|
| 14–29 days | $80 | $74 | Cheapest seen | 15 |
| 30–59 days | $125 | $125 | +56% | 8 |
| 60–89 days | $107 | $107 | +34% | 12 |
Live price for these dates
The cheapest return found recently is for 25 Dec – 2 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.
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