Cheap Flights from San Diego International to Seattle

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Find the cheapest month or even day of the year to fly to Seattle

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Flight deals from San Diego International to Seattle

Looking for a cheap last-minute deal or the best return flight from San Diego International to Seattle? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from San Diego International to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Diego International to Seattle flights are currently cheapest in September.

Direct flights from San Diego International to Seattle

Alternative San Diego International to Seattle routes

Looking for the cheapest, fastest or easiest route from San Diego International to Seattle? You could fly into the following airports instead.

San Diego to Seattle: Flight information

The things to know before you go.
Cheapest flight foundR 1,252
Cheapest month to flySeptember
Average flight time3 hrs, 8 mins
Most popular airlineAlaska Airlines
Average flights per week449

Finding cheap flights from San Diego International to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from San Diego International to Seattle is R 2,495. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
3 hours and 8 minutes is the average flight time from San Diego International to Seattle.
Alaska Airlines, Hawaiian Airlines and Air Tahiti Nui fly direct from San Diego International to Seattle.
As of August 2025, there are 449 flights per week flying from San Diego International to Seattle.
The cheapest month to fly from San Diego International to Seattle is usually September.
If you're flying from San Diego International Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from R 2,495.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Diego International Airport to Seattle on Friday, 5 September 2025.
Yes – the average flight time is 3 hours and 8 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In August, the average temperature is usually around 18°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Frontier Airlines and Alaska Airlines offer the cheapest flight tickets to Seattle.

Travelling from San Diego International Airport (SAN) to Seattle: what you need to know

  • Book a direct flight from San Diego International Airport to Seattle and you'll be in the air for around 2 hours 50 minutes.

  • Seattle and San Diego (where San Diego International Airport is located) share the UTC-7 timezone. This means there's no time difference to adjust for.

  • With 91 weekly flights between the two airports, San Diego International Airport (SAN) to Seattle-Tacoma International Airport (SEA) is the busiest route. Alaska Airlines operates the earliest flight at 06:15. If you prefer to make the most of your day before jetting off, the latest flight from SAN to SEA is with Alaska Airlines at 20:50.

  • To avoid missing your SAN to Seattle flight, leave plenty of time for things like check-in and baggage drop. Arriving two hours before international departures and one hour before domestic flights is the general rule.

  • If you're travelling during a bank holiday or another peak period, give yourself extra time. A good rule is two hours before domestic flights and up to four hours before international departures. Security and check-in lines will be longer.

  • Begin your trip at SAN and travel nonstop to Seattle-Tacoma International Airport (SEA). That's where you can expect to touch down when searching for San Diego International Airport to Seattle tickets.

  • Take to the skies with Alaska Airlines. This well-known carrier operates direct flights from San Diego International Airport to Seattle.

  • Travelling from central San Diego to SAN takes about 20 minutes by public transport. If you drive, ride-share or take a cab, you'll cover the 3 kilometres in 10 minutes or so, depending on traffic.

  • Planning to catch an early flight from San Diego International Airport to Seattle? Avoid the hassle of rushing to the airport (and enjoy a little extra shut-eye) by choosing one of these stays near SAN:

  • When it comes to San Diego International Airport's on-time performance, 71.38% of flights meet their scheduled arrival time.

  • You'll find SAN at N Harbour Dr.

How to find the cheapest flights from San Diego International Airport (SAN) to Seattle

  • The lowest price we've seen for a one-way San Diego International Airport to Seattle flight is R 1,252. The cheapest price for a return flight is R 2,495. Bear in mind fares may change due to demand at the time of booking.

  • To secure cheap flights from SAN to Seattle, book your trip one month before your departure.

  • The best month for landing cheap San Diego International Airport to Seattle tickets is May. Use the 'Whole month' tool to compare prices, then select the dates that offer the biggest savings.

  • Finding a cheap flight from SAN to Seattle couldn't be easier with Price Alerts. Simply set up one of these automatic notifications and we'll notify you when a deal gets even better.

  • Tailor your flights with filters. Pick your arrival and departure times, total journey duration and airlines. You can also sort your results by 'Fastest,' 'Best' or 'Cheapest' flights from San Diego International Airport to Seattle.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • The distance from Seattle-Tacoma International Airport (SEA) to central Seattle is roughly 23 kilometres. It takes around 20 minutes to reach the centre driving.

  • If you're travelling on public transport, expect a journey time of about 55 minutes.

  • The last thing you want is a long journey to your hotel if you're getting in late on a flight from San Diego International Airport to Seattle. Book one of these accommodation options near SEA instead:

  • Explore without limits with a Seattle-Tacoma International Airport rental car. Book your wheels from Thrifty, Europcar or Budget and venture far and wide through Seattle and beyond.

  • Booking your ride from Seattle-Tacoma International Airport around one week in advance of your flight from SAN to Seattle can help you lock in the lowest rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from San Diego International Airport to Seattle has touched down, you can make your way to the city centre in about 10 minutes by car. Central Seattle is roughly 3 kilometres from Lake Union Sea Plane Base Airport (LKE).

  • You can expect the trip to take roughly 25 minutes on public transport.

  • Hang the 'Do not disturb' sign on your door and rest at a hotel near LKE. Here are a few options where you can kick back after your SAN to Seattle flight:

Best time to go to Seattle

  • Carefully consider your dates before locking in your flight from San Diego International Airport to Seattle. The city comes alive in peak season, but prices are often higher and major attractions can be crowded. Visit Seattle in the low season if you prefer a more relaxed vibe.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC (54ºF) and 28ºC (82ºF). Lock in your San Diego International Airport to Seattle flight ticket then if that's your definition of good weather.

  • Search for cheap tickets from SAN to Seattle in February if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -1ºC (30ºF) and 11ºC (52ºF) on average.

More about Seattle

  • Once you've booked your flight from San Diego International Airport to Seattle, find a hotel that offers both comfort and a great location. Make one of these options your base for exploring Seattle:

  • LMN Architects and Greyhound: Bus Station are just a couple of the popular attractions to add to your Seattle itinerary. Continue your sightseeing adventures at Boeing Radiation Effects Lab.

Explore more of United States

  • Portland is just one of the many cities in United States waiting to be discovered after you've seen Seattle. Around 241 kilometres away to the south, its top attractions include Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • If you're interested in discovering another major destination in United States, consider Spokane, about 370 kilometres east of Seattle. Manito Park, Northwest Museum of Arts & Culture and Spokane Falls are the start of reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.