$99 Cheap Flights from Baltimore (BWI) to San Diego (SAN)

View $99 flight on Fri, Oct 3, 2025Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to San Diego Intl. Airport (SAN)

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Today's featured flight deals from Baltimore Washington Intl. Airport (BWI) to San Diego Intl. Airport (SAN)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Baltimore to San Diego (BWI-SAN)

Prices were available within the past 7 days and start at $99 for one-way flights and $169 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Oct 14 - Wed, Oct 29
BWI
Baltimore
SAN
San Diego
$169 Roundtrip, found 4 days ago
$169
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Tue, Oct 14 from Baltimore to San Diego, returning Wed, Oct 29, priced at $169 found 4 days ago
United
Tue, Nov 4 - Mon, Nov 10
BWI
Baltimore
SAN
San Diego
$180 Roundtrip, found 1 day ago
$180
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 4 from Baltimore to San Diego, returning Mon, Nov 10, priced at $180 found 1 day ago
American Airlines
Tue, Oct 7 - Sat, Oct 11
BWI
Baltimore
SAN
San Diego
$187 Roundtrip, found 1 day ago
$187
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Oct 7 from Baltimore to San Diego, returning Sat, Oct 11, priced at $187 found 1 day ago
United
Fri, Jan 30 - Mon, Feb 2
BWI
Baltimore
SAN
San Diego
$189 Roundtrip, found 2 days ago
$189
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jan 30 from Baltimore to San Diego, returning Mon, Feb 2, priced at $189 found 2 days ago
United
Sat, Dec 6 - Wed, Dec 10
BWI
Baltimore
SAN
San Diego
$190 Roundtrip, found 1 day ago
$190
Roundtrip
found 1 day ago
Select United flight, departing Sat, Dec 6 from Baltimore to San Diego, returning Wed, Dec 10, priced at $190 found 1 day ago
American Airlines
Sat, Nov 15 - Tue, Nov 18
BWI
Baltimore
SAN
San Diego
$191 Roundtrip, found 2 days ago
$191
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Nov 15 from Baltimore to San Diego, returning Tue, Nov 18, priced at $191 found 2 days ago
United
Thu, Jan 8 - Fri, Jan 9
BWI
Baltimore
SAN
San Diego
$193 Roundtrip, found 3 days ago
$193
Roundtrip
found 3 days ago
Select United flight, departing Thu, Jan 8 from Baltimore to San Diego, returning Fri, Jan 9, priced at $193 found 3 days ago
Spirit Airlines
Tue, Sep 30 - Wed, Oct 1
BWI
Baltimore
SAN
San Diego
$200 Roundtrip, found 6 hours ago
$200
Roundtrip
found 6 hours ago
Select Spirit Airlines flight, departing Tue, Sep 30 from Baltimore to San Diego, returning Wed, Oct 1, priced at $200 found 6 hours ago
United
Wed, Oct 22 - Wed, Oct 29
BWI
Baltimore
SAN
San Diego
$206 Roundtrip, found 3 days ago
$206
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 22 from Baltimore to San Diego, returning Wed, Oct 29, priced at $206 found 3 days ago
Frontier Airlines
Fri, Oct 17 - Sun, Oct 26
BWI
Baltimore
SAN
San Diego
$224 Roundtrip, found 17 hours ago
$224
Roundtrip
found 17 hours ago
Select Frontier Airlines flight, departing Fri, Oct 17 from Baltimore to San Diego, returning Sun, Oct 26, priced at $224 found 17 hours ago

Find the cheapest month to fly from Baltimore (BWI) to San Diego (SAN)

September is typically the cheapest month to fly

From $135 - $445 per traveler.
Flights from Baltimore (BWI) to San Diego (SAN)
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, Sun Country Airlines, United
Roundtrip price
$168
Distance
2290 mi
Average flight time
3 hours 31 mins

Baltimore to San Diego Flights

The cheapest times to fly from Baltimore 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 Baltimore to San Diego are during the month of October. You can find some of the cheapest flights from Baltimore to San Diego with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Baltimore 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 Baltimore 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 Baltimore to San Diego in 2025. You can also book with separate airlines for your outbound and return journeys, from $99 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 Baltimore 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 Baltimore 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.

 

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN) cost?
Secure a cheap one-way flight from $99 or cheap return flight from $169 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
The cheapest month to fly from BWI to SAN is October, when demand is low. Off-peak months are usually when airlines offer lower prices between these airports.
Which airlines fly direct from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
When jetting out of Baltimore Washington Intl. Thurgood Marshall Airport (BWI), you can jump on a nonstop flight to San Diego Intl. Airport (SAN) with Southwest Airlines.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
To find the cheapest airline flying from BWI to SAN, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
On average, only 1 direct flight departs daily from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN). Looking for more options? Use Expedia's filter tool to discover flights with layovers and squeeze in a visit to another city along the way.
What are the most popular departure times for flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
More travelers fly between BWI and SAN at 8 AM than at any other point in the day. Rather skip the crowds? Pick a flight outside the busiest times and it's possible you'll save on your ticket as well.
What day of the week has the most flights from BWI to SAN?
Friday offers the most flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN). Consider jetting off on this day and you'll have the best chance of finding a departure that works with your plans.
What is the earliest flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
The first flight of the day departing from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) is at around 8:45AM UTC-5. Board this plane and you'll land at San Diego Intl. Airport (SAN) at approximately 11:50AM UTC-8. The total time in the air is 6h 5m.
How long does it take to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
Flights from BWI to SAN have an average travel time of 5 hours and 58 minutes. The total distance between the two is 2,300 mi.
What airline has the least delays from BWI to SAN?
Spirit Airlines has the best performance for on-time direct flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN), with an on-time rating of 83%. Use the Expedia App to view your flight schedule before you leave and get notified of any trip changes.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
Opt for a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN) that takes off before 3 PM to reduce the risk of cancellations and delays. Departures later than this have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for San Diego from Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
If you're traveling on a direct flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego, San Diego Intl. Airport (SAN) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN) last-minute?
Holding off until just before your departure to book your flight from BWI to SAN generally means paying more. While you may come across some last-minute deals, they're not always guaranteed. Be flexible with your itinerary to boost your chances of scoring a bargain.
Is it cheaper to book a BWI to SAN flight and hotel package?
Securing a BWI to SAN flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Pick from our impressive range of hotels 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Diego Intl. Airport (SAN)?
If you reserved your BWI to SAN flight in the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you want more information.

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*Available to One Key members.