San Diego to Seattle CLD, SAN → SEA
McClellan-Palomar Airport (CLD), San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA)
The cheapest return found recently is $331 with Alaska Airlines, 25 Nov – 28 Nov, found today. The cheapest one-way found recently is $100 with Southwest Airlines, 2 Dec, found yesterday.
Return
The cheapest return fare on each of 3 departure dates is usually $246 to $368.
Cheapest return found recently
$331
25 Nov – 28 Nov · Alaska Airlines
San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA)
Leaves 2:55 p.m. · Return leaves 6:00 a.m. · 5 h 57 min of travel, both ways together
out nonstop, back nonstop
found today
Cheapest nonstop return
$331
25 Nov – 28 Nov · Alaska Airlines
San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA)
Leaves 2:55 p.m. · Return leaves 6:00 a.m. · 5 h 57 min of travel, both ways together
out nonstop, back nonstop
found today
Found recently, and the cheapest we hold
$331 25 Nov – 28 Novfound todaySee prices for these dates
$160 12 Jan 2027 – 16 Jan 2027found 5 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $141 to $401.
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 return price?
Compared with the cheapest return fare on each of 3 departure dates from 20 Nov to 12 Jan 2027, 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 3-night return fares leaving within 3 days of 25 Nov to compare.
Every date we hold
5 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Nov – 29 Nov | $404 | Alaska Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | out 1 stop, back nonstop | found 4 days ago | See prices for these dates |
| 25 Nov – 28 Nov | $331 | Alaska Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found today | See prices for these dates |
| 12 Jan 2027 – 16 Jan 2027 | $160 | Alaska Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | out nonstop, back nonstop | found 5 days ago | See prices for these dates |
Which month looks cheapest?
January 2027 is the cheapest month — from $160.
Airlines on the cheapest dates: Alaska Airlines.
One-way
The cheapest one-way fare on each of 7 departure dates is usually $100 to $168.
Cheapest one-way found recently
$100
2 Dec · Southwest Airlines
San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA)
Leaves 7:20 a.m. · 3 h 5 min trip
nonstop
found yesterday
Cheapest nonstop one-way
$100
2 Dec · Southwest Airlines
San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA)
Leaves 7:20 a.m. · 3 h 5 min trip
nonstop
found yesterday
Found recently, and the cheapest we hold
$100 2 Decfound yesterdayOpen this trip
$75 10 Novfound 6 days agoOpen this trip
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $55 to $94.
At $100, the cheapest one-way found recently is above 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 7 departure dates from 10 Nov to 2 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?
No. We hold one-way fares on 2 other departure dates within 3 days of 2 Dec, and none is cheaper.
Every date we hold
14 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 10 Nov | $75 | Southwest Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | nonstop | found 6 days ago | Open this trip |
| 23 Nov | $110 | Frontier Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 3 days ago | Open this trip |
| 27 Nov | $127 | Frontier Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 6 days ago | Open this trip |
| 28 Nov | $208 | United Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 5 days ago | Open this trip |
| 30 Nov | $214 | Southwest Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | 1 stop | found 3 days ago | Open this trip |
| 1 Dec | $100 | Southwest Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | nonstop | found 2 days ago | Open this trip |
| 2 Dec | $100 | Southwest Airlines | San Diego International Airport (SAN) → Seattle-Tacoma International Airport (SEA) | nonstop | found yesterday | Open this trip |
Which month looks cheapest?
November 2026 is the cheapest month — from $75.
Airlines on the cheapest dates: Southwest Airlines, Frontier Airlines, United Airlines.
Premium cabin fares from San Diego 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 Nov – 28 Nov in another cabin: Premium economy · Business · First
Today's prices for 2 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Diego to Seattle?
Return
Fares 30 to 59 days before departure were typically 47% lower than 0 to 6 days before departure.
From the cheapest return 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 |
|---|---|---|---|---|
| 0–6 days | $401 | $344 | +89% | 7 |
| 7–13 days | $225 | $225 | +6% | 9 |
| 30–59 days | $212 | $162 | Cheapest seen | 21 |
| 90–179 days | $220 | $160 | +4% | 10 |
One-way
Fares 30 to 59 days before departure were typically 7% lower than 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 | $76 | $75 | +7% | 9 |
| 30–59 days | $71 | $55 | Cheapest seen | 24 |
| 60–89 days | $99 | $99 | +39% | 7 |
Live price for these dates
The cheapest return found recently is for 25 Nov – 28 Nov. 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