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Flights from Seattle to San Diego

Search cheap flights from Seattle to San Diego in the next 3 months. Based on Trip.com's latest 7-day data, one-way fares start at US$88, and round-trip tickets start at US$132.

      • Cheapest nonstop
        SEA 19:55
        2h 54m
        Nonstop
        SAN 22:49
        Seattle - San Diego | Tue, Sep 1 | Delta Air Lines
        SAN 16:11
        2h 54m
        Nonstop
        SEA 19:05
        San Diego - Seattle | Sat, Sep 5 | Delta Air Lines
        US$132 US$169
        22% off
        22% off
        US$169 US$132
      • SEA 09:45
        2h 54m
        Nonstop
        SAN 12:39
        Seattle - San Diego | Sat, Sep 5 | Delta Air Lines
        SAN 07:00
        3h 5m
        Nonstop
        SEA 10:05
        San Diego - Seattle | Tue, Sep 8 | Delta Air Lines
        US$133 US$169
        21% off
        21% off
        US$169 US$133
      • SEA 07:40
        2h 59m
        Nonstop
        SAN 10:39
        Seattle - San Diego | Sat, Sep 5 | Alaska Airlines
        SAN 07:15
        3h 10m
        Nonstop
        SEA 10:25
        San Diego - Seattle | Sun, Sep 6 | Alaska Airlines
        US$138 US$169
        18% off
        18% off
        US$169 US$138
      • SEA 07:40
        2h 59m
        Nonstop
        SAN 10:39
        Seattle - San Diego | Wed, Aug 26 | Alaska Airlines
        SAN 06:15
        3h 5m
        Nonstop
        SEA 09:20
        San Diego - Seattle | Wed, Sep 2 | Alaska Airlines
        US$141
        17% off
        US$169 US$141
      • SEA 20:49
        2h 55m
        Nonstop
        SAN 23:44
        Seattle - San Diego | Mon, Aug 24 | Alaska Airlines
        SAN 20:33
        3h 7m
        Nonstop
        SEA 23:40
        San Diego - Seattle | Mon, Aug 31 | Alaska Airlines
        US$141
        17% off
        US$169 US$141
      • SEA 19:50
        2h 55m
        Nonstop
        SAN 22:45
        Seattle - San Diego | Thu, Aug 20 | Alaska Airlines
        SAN 06:15
        3h 5m
        Nonstop
        SEA 09:20
        San Diego - Seattle | Tue, Aug 25 | Alaska Airlines
        US$147
        13% off
        US$169 US$147
      • SEA 13:00
        17h 25m
        1 stop
        SAN 14:00
        Seattle - San Diego | Wed, Jul 22 | Normal Airline
        SAN 15:00
        6h
        Nonstop
        SEA 16:00
        San Diego - Seattle | Fri, Jul 24 | Normal Airline
        Find more flights
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      • SEA 06:10
        5h 47m
        1 stop
        SAN 11:57
        Seattle - San Diego | Wed, Aug 19 | American Airlines
        US$88 US$104
        15% off
        15% off
        US$104 US$88
      • SEA 06:10
        5h 47m
        1 stop
        SAN 11:57
        Seattle - San Diego | Tue, Aug 25 | American Airlines
        US$89 US$104
        14% off
        14% off
        US$104 US$89
      • SEA 13:00
        17h 25m
        1 stop
        SAN 14:00
        Seattle - San Diego | Wed, Jul 22 | Normal Airline
        Find more flights
        Find more flights

Cheapest airlines flights from Seattle to San Diego

You can choose from 3 airlines that fly from Seattle to San Diego, including Alaska Airlines, Delta Air Lines, and United Airlines. American Airlines has lowest fares on this route.
Alaska Airlines logo Alaska Airlines
Delta Air Lines logo Delta Air Lines
United Airlines logo United Airlines
Airlines are determined based on actual purchased flight tickets from Seattle to San Diego according to previous 12 months data from Trip.com.

Seattle to San Diego Flight Details

The distance between Seattle and San Diego is about 1,692.33 km. The average flying time from Seattle to San Diego is around 3 hours 1 minute. Based on Trip.com's latest data, travel demand is highest in July. The off-season for travel is November.

Cheapest one-way flight priceUS$88
Cheapest return ticket priceUS$132
Cheapest monthNovember
Peak season for travelJuly
Flight distance1,692.33 km
Average flight time3 hours 1 minute
Popular airlineAlaska Airlines
Flight statistics for the Seattle–San Diego route are based on aggregated booking data from Trip.com over the past 12 months.

Trip.com Price Insights on Flights from Seattle to San Diego

Which month has the cheapest one-way flights from Seattle to San Diego?

Average monthly one-way flight prices from Seattle to San Diego, based on bookings made by Trip.com users over the past 12 months.

Based on Trip.com’s data, the cheapest month for flights from Seattle to San Diego is December, with an average price of US$162; while the month with the highest flight price is usually February, with an average price of up to US$312.

US$312
US$237
US$162
US$87
    Cheapest
  • US$211
    Jul
  • US$280
    Aug
  • US$209
    Sep
  • US$219
    Oct
  • US$241
    Nov
  • US$162
    Dec
  • US$230
    Jan
  • US$312
    Feb
  • US$194
    Mar
  • US$206
    Apr
  • US$188
    May
  • US$239
    Jun

Which month has the cheapest round-trip flights from Seattle to San Diego?

The average price of round-trip flights from Seattle to San Diego purchased by Trip.com users by month over the past 12 months.

Based on data from Trip.com, the lowest prices for round-trip flights from Seattle to San Diego are found during February, with an average price of US$242. Conversely, the highest prices are found during November, with an average price of up to US$524.

US$524
US$383
US$242
US$101
    Cheapest
  • US$303
    Jul
  • US$288
    Aug
  • US$288
    Sep
  • US$246
    Oct
  • US$524
    Nov
  • US$408
    Dec
  • US$294
    Jan
  • US$242
    Feb
  • US$389
    Mar
  • US$409
    Apr
  • US$378
    May
  • US$334
    Jun

Frequently Asked Questions

  • What are the cheapest flights from Seattle to San Diego (SEA-SAN)?

    Based on Trip.com data, American Airlines offers one-way fares as low as US$88 on Cheapest nonstop routes (e.g. SEA to SAN on Wed, Aug 19), while Delta Air Lines offers Cheapest nonstop round-trips from US$132 departing on Tue, Sep 1 and returning on Sat, Sep 5.
  • At the moment, you can catch a nonstop flight from Seattle to San Diego with the following airlines, including: Alaska Airlines Delta Air Lines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes about 3 hours 1 minute to fly from Seattle to San Diego.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to San Diego is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • Based on Trip.com data in the past 4 weeks, there is 94 flight per week flying from Seattle to San Diego. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS1361 (06:26) Delta Air Lines: S/M/T/W/T/F/S -- DL2508 (07:40)
  • To find best deals on flights from Seattle to San Diego, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Aug 19, with one-way flights priced at just US$88.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is American Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for San Diego travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Seattle to San Diego is November, when demand for travel is lower.
  • After crunching the numbers on our July flight calendar, it's currently cheapest to fly from Seattle to San Diego on July 29, 2026 with Alaska Airlines, with prices starting at US$149.
  • You can land at any one of the following hubs in San Diego, with Seattle-Tacoma International Airport to San Diego International Airport (SEA-SAN) is by far the most common option on this route: McClellan-Palomar Airport (CLD) Marine Corps Air Station Miramar (NKX) San Diego International Airport (SAN).
  • The time difference between San Diego and Seattle is 0h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

Trip.com Airline Insights on Flights from Seattle to San Diego

Which airline offers the cheapest direct flights from Seattle to San Diego?

Data is based on the average price of all nonstop flights from Seattle to San Diego on Trip.com over the past 12 months.

Based on Trip.com’s data from the past 12 months, Frontier Airlines provides the lowest-priced direct flights from Seattle to San Diego, with fares starting at US$136.

US$44
US$136
US$229
US$322
US$414
Frontier Airlines
US$136
Frontier Airlines
Delta Air Lines
US$238
Delta Air Lines
Alaska Airlines
US$279
Alaska Airlines
Hawaiian Airlines
US$316
Hawaiian Airlines
United Airlines
US$414
United Airlines

Which airline operates the most flights from Seattle to San Diego?

Total flights from Seattle to San Diego across all airlines. (Based on Trip.com data from the past month)

Based on Trip.com’s data from the past month, Alaska Airlines operates the most frequent flights from Seattle to San Diego, with 66 flights per week.

0
18
42
66
Alaska Airlines
66
Alaska Airlines
Qatar Airways
39
Qatar Airways
Delta Air Lines
36
Delta Air Lines
American Airlines
21
American Airlines
Korean Air
19
Korean Air
STARLUX Airlines
18
STARLUX Airlines

How many flights fly from Seattle to San Diego daily?

The data is based on the flight numbers for each day of the week from Seattle to San Diego within the Trip.com database over the past month.

Based on the past month's historical data from Trip.com, the number of flights from Seattle to San Diego is the highest on Friday and the lowest on Wednesday.

239
197
155
113
Highest
172
Mon
174
Tue
155
Wed
171
Thu
239
Fri
162
Sat
198
Sun

Explore More Popular Flights

Note: Prices shown on this page are the estimated lowest prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before you pay. Charges for checked baggage, onboard meals, Wi‑Fi, and other optional services are also included where applicable in the flight cards.

Real-time pricing updates

Prices, availability, and travel details on this page have been updated within the last 24 hours, and for many routes are refreshed in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.