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£130 Cheap Flights from Washington (IAD) to San Diego (SAN)

View £130 flight on Sat, 22 Aug 2026Opens in a new window

Popular airlines from Washington Dulles International Airport (IAD) to San Diego Intl. Airport (SAN)

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Cheap Flights from Washington (IAD) to San Diego (SAN)

Prices were available within the past 7 days and start at £130 for one-way flights and £230 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, 8 Sept - Tue, 15 Sept
IAD
Washington
SAN
San Diego
£230 Return, just found
£230
Return
just found
Select Alaska Airlines flight, departing Tue, 8 Sept from Washington to San Diego, returning Tue, 15 Sept, priced at £230 just found
Alaska Airlines
Tue, 8 Sept - Tue, 15 Sept
IAD
Washington
SAN
San Diego
£249 Return, just found
£249
Return
just found
Select Alaska Airlines flight, departing Tue, 8 Sept from Washington to San Diego, returning Tue, 15 Sept, priced at £249 just found
Alaska Airlines
Sun, 25 Oct - Tue, 10 Nov
IAD
Washington
SAN
San Diego
£261 Return, found 1 day ago
£261
Return
found 1 day ago
Select Alaska Airlines flight, departing Sun, 25 Oct from Washington to San Diego, returning Tue, 10 Nov, priced at £261 found 1 day ago
Alaska Airlines
Tue, 8 Sept - Tue, 15 Sept
IAD
Washington
SAN
San Diego
£268 Return, just found
£268
Return
just found
Select Alaska Airlines flight, departing Tue, 8 Sept from Washington to San Diego, returning Tue, 15 Sept, priced at £268 just found
Alaska Airlines
Tue, 8 Sept - Tue, 15 Sept
IAD
Washington
SAN
San Diego
£269 Return, found 1 day ago
£269
Return
found 1 day ago
Select Alaska Airlines flight, departing Tue, 8 Sept from Washington to San Diego, returning Tue, 15 Sept, priced at £269 found 1 day ago
Alaska Airlines
Wed, 19 Aug - Sat, 22 Aug
IAD
Washington
SAN
San Diego
£277 Return, found 6 days ago
£277
Return
found 6 days ago
Select Alaska Airlines flight, departing Wed, 19 Aug from Washington to San Diego, returning Sat, 22 Aug, priced at £277 found 6 days ago
Alaska Airlines
Sun, 27 Sept - Wed, 7 Oct
IAD
Washington
SAN
San Diego
£282 Return, found 5 days ago
£282
Return
found 5 days ago
Select Alaska Airlines flight, departing Sun, 27 Sept from Washington to San Diego, returning Wed, 7 Oct, priced at £282 found 5 days ago
Alaska Airlines
Tue, 8 Sept - Tue, 15 Sept
IAD
Washington
SAN
San Diego
£287 Return, just found
£287
Return
just found
Select Alaska Airlines flight, departing Tue, 8 Sept from Washington to San Diego, returning Tue, 15 Sept, priced at £287 just found
Delta
Sun, 12 Jul - Mon, 13 Jul
IAD
Washington
SAN
San Diego
£553 Return, found 2 days ago
£553
Return
found 2 days ago
Select Delta flight, departing Sun, 12 Jul from Washington to San Diego, returning Mon, 13 Jul, priced at £553 found 2 days ago
American Airlines
Thu, 9 Jul - Tue, 14 Jul
IAD
Washington
SAN
San Diego
£662 Return, found 2 days ago
£662
Return
found 2 days ago
Select American Airlines flight, departing Thu, 9 Jul from Washington to San Diego, returning Tue, 14 Jul, priced at £662 found 2 days ago

Frequently asked questions

How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) cost?
You can find one-way and return flights from IAD to SAN with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to SAN ticket fares go up or down.
What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The cheapest months to fly from IAD to SAN are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
Only one airline offers direct flights from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.). United operates 21 direct flights from IAD to SAN every week.
What is the cheapest airline that flies from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
Sun Country Airlines is one of the cheapest airlines offering connecting return flights on this route, with tickets starting from around £218. United is one of the cheapest airlines offering nonstop return flights from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.), with tickets starting from around £366 for flights that can be booked for departure within the next year. These prices are per adult for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Washington, DC (IAD) to San Diego, CA (SAN)?
To find a cheap flight from Washington, DC (IAD) to San Diego, CA (SAN), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The earliest flight from Washington Dulles Intl. (IAD) to San Diego Intl. (SAN) typically departs around 5:00 AM. This flight is operated by American Airlines. This is a seasonal service active in February and March. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
A non-stop flight from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) typically takes around 5 hours 30 minutes. This route covers a distance of approximately 3,619 kilometers. If you opt for a one-stop flight, your journey will generally take longer, around 7 hours 30 minutes. Flights with two or more stops will extend your travel time even further, usually to about 13 hours. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some flexibility in your travel plans.
Can you fly business or first class from Washington, DC (IAD) to San Diego, CA (SAN)?
Select the "Business class" and "First class" filters when looking for Washington, DC (IAD) to San Diego, CA (SAN) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for San Diego, CA (SAN) from Washington, DC (IAD)?
If you're planning to travel to San Diego from Washington Dulles Intl. (IAD), you can fly directly into San Diego Intl. (SAN). Some flights may connect through major hubs like Denver Intl. (DEN), Charlotte-Douglas Intl. (CLT), or Dallas-Fort Worth Intl. (DFW) before reaching San Diego. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) flight and hotel package?
Securing a Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD) to San Diego, CA (SAN)?
If you booked your Washington, DC (IAD) to San Diego, CA (SAN) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines
Return price
£230
Distance
3598 km
Average flight time
3 hours 14 mins

Book with confidence

Compare flights from Washington to San Diego easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Washington to San Diego. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to San Diego Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Washington Dulles Intl. to San Diego Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Washington Dulles Intl. (IAD) to San Diego Intl. (SAN)

The easiest way to view the best deals on flights from Washington to San Diego today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Washington Dulles Intl. to San Diego Intl. start at just £230 and range up to £662.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Washington and San Diego
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Washington to San Diego flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Washington Dulles Intl. to San Diego Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Washington to San Diego easily and book with confidence

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*Available to Expedia members.