$139 Cheap Delta flights San Diego (SAN) to Washington (IAD)

Apply the “Price (lowest to highest)” filter on Expedia to find cheap Delta Air Lines round-trip flights from $233 from SAN to IAD. Affordable one-way options from $139 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the cheapest months to jet away to Washington with Delta Air Lines. You could also find great prices on one-way and round-trip tickets in February.

To find cheap Delta Air Lines fares from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence the overall cost. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To see if there’s a direct route from SAN to IAD with Delta Air Lines or another airline, check the “Nonstop” box when searching for tickets.

Sort your results by “Early Morning” and “Morning” to browse the earliest flights from SAN to IAD. Taking off early means you’re less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Delta Air Lines flights from San Diego Intl. Airport (SAN) to Washington come in to Washington Dulles Intl. Airport (IAD). This is the main gateway to this city.

With an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a popular option for many passengers heading from SAN to IAD. Plus, if you’re a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be spent on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of ticket you purchased, a fee will generally apply if you modify or cancel your booking more than 24 hours after it’s confirmed. To find tickets with more flexibility, select our “Changes included” or “No cancel fee” filter while looking for flights. To learn more about changing or canceling your reservation, go to “Trips,” select your flight and click on “Manage Booking.”