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$139 Cheap Flights from Washington (IAD) to San Diego (SAN)

View $139 flight on Thu, Sep 24, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $139 for one-way flights and $278 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Sep 30 - Tue, Oct 6
IAD
Washington
SAN
San Diego
$278 Roundtrip, just found
$278
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Sep 30 from Washington to San Diego, returning Tue, Oct 6, priced at $278 just found
Frontier Airlines
Sat, Sep 12 - Sat, Sep 19
IAD
Washington
SAN
San Diego
$288 Roundtrip, just found
$288
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Sep 12 from Washington to San Diego, returning Sat, Sep 19, priced at $288 just found
Frontier Airlines
Thu, Oct 1 - Tue, Oct 6
IAD
Washington
SAN
San Diego
$307 Roundtrip, just found
$307
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 1 from Washington to San Diego, returning Tue, Oct 6, priced at $307 just found
Frontier Airlines
Wed, Sep 30 - Tue, Oct 6
IAD
Washington
SAN
San Diego
$313 Roundtrip, just found
$313
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Sep 30 from Washington to San Diego, returning Tue, Oct 6, priced at $313 just found
United
Tue, Jan 26 - Sat, Feb 6
IAD
Washington
SAN
San Diego
$317 Roundtrip, just found
$317
Roundtrip
just found
Select United flight, departing Tue, Jan 26 from Washington to San Diego, returning Sat, Feb 6, priced at $317 just found
Frontier Airlines
Sat, Sep 12 - Sat, Sep 19
IAD
Washington
SAN
San Diego
$318 Roundtrip, just found
$318
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Sep 12 from Washington to San Diego, returning Sat, Sep 19, priced at $318 just found
United
Sat, Sep 26 - Tue, Sep 29
IAD
Washington
SAN
San Diego
$323 Roundtrip, just found
$323
Roundtrip
just found
Select United flight, departing Sat, Sep 26 from Washington to San Diego, returning Tue, Sep 29, priced at $323 just found
Alaska Airlines
Tue, Jan 26 - Sat, Feb 6
IAD
Washington
SAN
San Diego
$327 Roundtrip, just found
$327
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Jan 26 from Washington to San Diego, returning Sat, Feb 6, priced at $327 just found
Delta
Tue, Jan 26 - Sat, Feb 6
IAD
Washington
SAN
San Diego
$337 Roundtrip, just found
$337
Roundtrip
just found
Select Delta flight, departing Tue, Jan 26 from Washington to San Diego, returning Sat, Feb 6, priced at $337 just found
American Airlines
Tue, Jan 26 - Sat, Feb 6
IAD
Washington
SAN
San Diego
$337 Roundtrip, just found
$337
Roundtrip
just found
Select American Airlines flight, departing Tue, Jan 26 from Washington to San Diego, returning Sat, Feb 6, priced at $337 just found

Alternative airports near San Diego

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to McClellan-Palomar CLD. Cheapest option available. Average driving time to city center is 38 minutes. Flights from $529
CLD
McClellan-Palomar
Cheapest
Average driving time to city center38 min
Flights from $529

Find the cheapest month to fly from Washington (IAD) to San Diego (SAN)

September is typically the cheapest month to fly

From $258 - $367 per traveler.

What you need to know for your flight from Washington Dulles Intl. to San Diego Intl.

Washington (IAD) to San Diego (SAN) at a glance

Travel from Washington Dulles International Airport (IAD) to San Diego International Airport (SAN) on this popular domestic long-haul route, with various airlines offering weekly flights. Whether you prefer a full-service airline or a budget-friendly option, you can compare flight prices to find the best itinerary that aligns with your travel plans. Get ready to explore the iconic sights and vibrant neighborhoods of San Diego as you prepare for your next flight from Washington to this beautiful California destination.

  • Fastest flight duration: around 5h 45m non-stop
  • Route distance: roughly 2,300 miles (3,700 km)
  • Flights per week: around 30+ flights with multiple daily departures on average
  • Typical fares (one-way): economy tickets often range from $120–$435, depending on seasonality and how far ahead you book

Flights from Washington Dulles International Airport (IAD) to San Diego International Airport (SAN)

Based on the latest traveler bookings, here are the top airlines favored for flights from Washington to San Diego, particularly for non-stop and one-stop options. Popular layover points include Harry Reid International Airport (LAS) with an approximately 1 hour and 15 minutes layover, Denver International Airport (DEN) also at around 1 hour and 15 minutes, and Sky Harbor International Airport (PHX) with a 1-hour layover. This variety allows you to customize your trip by balancing price, total travel time, and cabin class for the ideal itinerary.

  • United: As a comprehensive carrier, United offers both non-stop and one-stop flights, with one-way ticket prices generally between $125 and $515. This airline represents about 64% of departures for this route, with a non-stop travel duration of approximately 5 hours and 45 minutes.
  • Alaska Airlines: Known for its full-service options, Alaska Airlines provides non-stop flights with fares typically ranging from $120 to $470. This carrier makes up around 21% of the departures for this route and has a total travel time of 5 hours and 45 minutes.
  • Southwest Airlines: A budget-friendly option, Southwest Airlines offers one-stop service with one-way fares usually between $120 and $450. It accounts for nearly 4% of departures on this route, featuring an in-flight duration of 6 hours and 30 minutes and an overall journey time of about 7 hours and 30 minutes, including layover time.
  • American Airlines: This full-service airline provides both non-stop and one-stop flights, with ticket prices typically from $120 to $630. American Airlines represents about 4% of departures for this route, with a one-stop flight time of approximately 6 hours and 30 minutes and a total journey length of around 7 hours and 30 minutes.
  • Frontier Airlines: A low-cost carrier, Frontier Airlines offers one-stop service with one-way fares generally between $120 and $245. It comprises about 3% of departures on this route, featuring an in-flight duration of 6 hours and 30 minutes and a total travel time of roughly 7 hours and 30 minutes, including layover.

Travelers flying from Washington to San Diego have the option to enhance their journey with upgrades. Top carriers include United, which provides first class, business class, and premium economy service; Alaska Airlines, offering first class and business class; and American Airlines, featuring first class service.

Best time to fly from Washington (IAD) to San Diego (SAN)

The most popular months for travelers flying from Washington to San Diego are January, March, and April, when peak temperatures in San Diego reach up to 60.6°F in April. If you prefer quieter travel, consider September, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 72°F. For better deals, May usually offers the lowest average one-way fare around $235. Flight availability peaks in June and July, with approximately 38 flights per week, making it easier to find convenient departure times. January and December have the fewest flights, with approximately 26 flights per week.

  • Cheapest time to fly: May usually offers good deals with average one-way fare around $235, roughly 9% cheaper than the yearly average.
  • More budget-friendly months to fly: August, February, and September typically offer average one-way fares roughly ranging from $238 to $250.
  • Most flight options: June and July have the highest number of flights from Washington to San Diego, with approximately 38 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January57.4°F (14.1°C)Moderately High26$260
February56.8°F (13.8°C)Average28$246
March58.1°F (14.5°C)Moderately High29$281
April60.6°F (15.9°C)Moderately High29$273
May62.6°F (17.0°C)Average30$235
June66.4°F (19.1°C)Average38$254
July70.5°F (21.4°C)Average38$260
August72.3°F (22.4°C)Average33$238
September72.0°F (22.2°C)Moderately Low30$250
October68.2°F (20.1°C)Moderately Low30$261
November62.6°F (17.0°C)Moderately Low28$258
December57.4°F (14.1°C)Average26$309

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Washington (IAD) to San Diego (SAN)

  • Washington to San Diego (DCA-SAN): Ronald Reagan Washington National Airport (DCA) is located approximately 23 miles from Washington Dulles International Airport (IAD). On this route, one-way economy prices generally fluctuate between $95 and $430, influenced by the season and the timing of your booking. Travelers can choose between one-stop and non-stop flights, with common layover locations including Denver International Airport (DEN) and O'Hare International Airport (ORD). The leading airlines operating on this route are Alaska Airlines and the budget-friendly Frontier Airlines. Additionally, business and first class service options are also available.

How to find the best prices for flights from Washington (IAD) to San Diego (SAN)

Getting some of the best deals on flights from Washington to San Diego is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually found when booking 2-8 weeks in advance, which coincides with when most travelers make their reservations. Departures in the afternoon (12 PM-6 PM) also tend to be less expensive and are the most popular flight times. Additionally, flying on Wednesday generally offers lower prices, while Thursday is the most sought-after travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.* Find San Diego hotel and flight deals.
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at San Diego International Airport from Washington Dulles International Airport

San Diego welcomes travelers from Washington with a range of transport options based on price, convenience, and proximity. For departures, Washington Dulles International Airport is roughly a 40-minute drive (covering about 29 miles) from central Washington. Here's how to reach San Diego efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in San Diego, with options including free hotel shuttles and private rides, which can be arranged in advance with your hotel.
  • Car rental: Renting a car from San Diego International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at San Diego International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From San Diego International Airport, Seaport, a seaport, is located about 0.1 miles away on foot, while Middletown Station, a metro station, is approximately 2.3 miles from the airport by car. Additionally, B Street Cruise Ship Terminal, a cruise terminal, can be reached about 3 miles away by car, providing various travel options for visitors.

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 cheap one-way flights from $139 and cheap return flights from $278 Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) with Expedia. One-way flights usually range from $133 to $1508, and return flights typically cost between $349 and $2168. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The cheapest month to fly from IAD to SAN is September 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're 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.)?
Choose from 2 airlines operating direct flights from IAD to SAN:

  • United operates around 21 direct flights from IAD to SAN every week
  • Hawaiian Airlines operates around 7 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 flights from Washington, DC (IAD) to San Diego, CA (SAN), with round-trip tickets starting from around $375. 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.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.), 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 airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The best airline to fly with from Washington, DC (IAD) to San Diego, CA (SAN) will differ from traveler to traveler. If you like to fly early, United offers early morning flights. If price is the most important factor, Alaska Airlines typically offers the lowest fares. United also offers the most daily flights from IAD to SAN, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
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.
How many flights per day from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
On average, there are around 3 nonstop flights per day from Washington Dulles Intl. (IAD) to San Diego Intl. (SAN). For more options, look at flights that include layovers.
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 International Airport (IAD) to San Diego International Airport (SAN) typically departs at 5:00 AM, operated by American Airlines. An early departure like this allows you to make the most of your day in San Diego. This service operates seasonally in February and March. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The most popular departure times for flights from Washington, DC (IAD) to San Diego, CA (SAN) are from 6am to 9am. About 26% of passengers prefer this time window. Many major carriers, including Delta Air Lines, United Airlines, and American Airlines, offer flights during this window. This timing is popular because it allows you to arrive in San Diego with a full day ahead to explore.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
A nonstop flight from IAD to SAN typically takes around 5 hours 50 minutes, covering approximately 2,249 miles. Connecting flights on this route usually add 2 hours to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
You can fly first class between IAD and SAN. First class cabins are available on:

  • Delta Air Lines
  • American Airlines
  • United Airlines

How much is a business class flight from Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
A direct, return business class ticket from Washington, DC (IAD) to San Diego (SAN) typically costs between $1,706 - $2,421. A non-stop, one-way business class flight is usually around $899 - $1,930. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
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 from Washington Dulles Intl. (IAD)?
From Washington Dulles Intl. (IAD), you can fly into San Diego Intl. (SAN) to reach San Diego. Some flights may connect through major hubs like Denver Intl. (DEN), Charlotte-Douglas Intl. (CLT), 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.) San Diego Vacation Packages 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-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.)?
If you booked your Washington, DC (IAD-Washington Dulles Intl.) to San Diego, CA (SAN-San Diego Intl.) 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, American Airlines, Delta, Frontier Airlines, Sun Country Airlines, United
Roundtrip price
$278
Distance
2249 mi
Average flight time
4 hours 20 mins

Book with confidence

Washington to San Diego Flights

The cheapest times to fly from Washington to San Diego

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to San Diego are during the month of September. You can find some of the cheapest flights from Washington to San Diego with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to San Diego

Sunday is one of the best days to book for cheap flights from Washington to San Diego: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to San Diego

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to San Diego in 2026. You can also book with separate airlines for your outbound and return journeys, from $139 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to San Diego flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to San Diego airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to San Diego Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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