ACM-SIAM Symposium on Discrete Algorithms (SODA24) | SIAM

Hotel and Transportation Information

ACM-SIAM Symposium on Discrete Algorithms (SODA24)

Hotel & Transportation Information

Hotel Reservation Deadline

Hotel Reservation Deadline

December 4, 2023



Westin Alexandria Old Town

400 Courthouse Square Alexandria, VA 22314, U.S.
Phone: +1-703-253-8600
Toll free Reservations (USA and Canada): +1-888-236-2427

Student Rate

$99 Student rate rooms are SOLD OUT.

Government Rate
Government employees are encouraged to reserve a room in the conference block at the group rate of $127. The negotiated group rate is below the standard GSA rates.

Welcome Reception
When making your hotel reservation, remember the Welcome Reception is scheduled for Saturday, January 6, 2024. This is an excellent networking opportunity!

Other Hotels


Conference Location

Westin Alexandria Old Town
400 Courthouse Square Alexandria, VA 22314, U.S.
Phone: +1-703-253-8600
Toll Free Phone: +1-888-236-2427


Hotel guests attending the conference will receive a discounted parking rate of $25 per night. The discounted parking rate is only available to attendees booked within the official SIAM hotel room block

Transportation Information

Additional Information

Hotel Location

With a nice blend of modern convenience and boutique sophistication, The Westin Alexandria Old Town is perfect for conducting business and exploring historic charm. You'll find beauty along the cobblestone streets and red brick sidewalks in Old Town Alexandria, home to specialty shops, boutiques, and museums. Just across the Potomac River, you can discover first-class attractions at National Harbor and Washington, D.C. After navigating through Old Town, relax and recharge in luxury in the contemporary rooms, where you can seek entertainment on the flat-panel TVs and prioritize productivity at the ergonomic workstations. Once hunger strikes, delight in the convenience of the 24-hour room service, and savor innovative American cuisine at the on-site restaurant. Stay active at the 24-hour WestinWORKOUT® Fitness Studio. Planning a special occasion in the city? Celebrate your happily-ever-after and business successes in the hotel venues. At The Westin Alexandria Old Town, pamper yourself with a revitalizing getaway.

Did you know?

Your support in staying at The Westin Alexandria Old Town helps keep the conference costs down, which directly affects your registration fees. SIAM guarantees the hotel that we will fill a certain number of “room nights” (rooms per night) during the conference. SIAM incurs penalties if too many attendees opt to stay in other hotels in the area or neglect to indicate to the hotel that they are with the SIAM conference. Currently, conference costs do not include meeting room rental. If SIAM fails to fill the contracted room block, SIAM is charged the cost for the meeting rooms daily, along with a hefty penalty. Future registration fees could increase to cover these additional risks.


SIAM is holding a block of rooms at The Westin Alexandria Old Town. These rooms are being held on a first-come, first-served basis at the following discounted rates. Please be aware the room block fills quickly, so we suggest you make your hotel and travel plans early.

The group rate is guaranteed until 5:00 p.m. Eastern time on December 4, 2023, or until the room block is full . If rooms are available after the cutoff date, they will be offered at the best available rate.

Reservation Deadline – December 4, 2023 (or until the room block is filled)

Single/Double Room Rate*                                               $127 per night plus 16%tax
Student Rate                                                                      $99 per night plus 16% tax Student rate rooms are SOLD OUT.
Student ID must be presented upon check-in. SIAM has negotiated a limited number of special student rate rooms. Please book early as these rooms sell out quickly!

Room rates include complimentary internet access.
All rooms based on availability.
All rates are subject to state and local occupancy taxes.
*Additional fees of $20 per person apply to triple and quad occupancy.

In the event that you find a lower room rate, please make the reservation at the lower rate and notify SIAM immediately ([email protected]). By doing this you will receive the lower rate and be counted towards the SIAM room block. However, please be aware by booking outside the SIAM room block at a lower rate, you may not receive the same benefits as rooms reserved in the SIAM room block (i.e. complimentary internet access).

To receive the SIAM rate, make your reservations using the appropriate online reservation link or by calling the hotel directly and identifying yourself as a SIAM attendee:
Toll Free Reservations (U.S. and Canada): 888-236-2427
Direct Telephone Number: +1-703-253-8600

Do not make your reservation online using the hotel’s general website, as this will not allow you to obtain the SIAM group rate. Be sure to use the online reservation link above if making reservations online. Remember to get your confirmation number!

Reservations are not confirmed until acknowledged in writing by the hotel or verified by phone. Be sure to get a confirmation number from the hotel and be prepared to provide that number to the front desk clerk upon check-in at the hotel.


If you need to change or cancel your reservation, you must contact the hotel prior to 6:00 p.m. on the scheduled arrival date to avoid a cancellation fee. You can contact the hotel at 888-236-2427 (U.S. and Canada) or +1-703-253-8600. Remember to get a cancellation number!

Check-In and Check-Out

Check-in time is 3:00 p.m. and check-out time is 12:00 p.m.

Early Departure

The hotel may charge an early departure fee if an attendee checks out prior to the original checkout date. Attendees are responsible for informing the hotel of reservation changes as soon as possible and should confirm their scheduled departure date when checking into the hotel.


The hotel requires a credit card to confirm and guarantee your reservation and will send out e-mail confirmations upon request.


By Air

Attendees should make reservations directly with their preferred airline, travel agency or travel website.

Ground Transportation

Public Transportation from Airport
Taxis are available at the airport for transportation to the hotel. Please The Westin Alexandria Old Town website and go to the bottom of the page under “Getting Here” to find local directions. Additional ground transportation information is available on the Washington Dulles International Airport website.

By Train
Amtrak has a rail station in Alexandria. To make train reservations through Amtrak, call (800) USA-RAIL, go to or contact your travel agency or travel website. Taxis are available at the train station for transportation to the hotel.

Rental Cars
Many major car rental companies have offices inside the airport terminal. You can make your arrangements when you arrive at the airport, or you can make them through your own travel agency or travel website.

Driving Directions
When using a phone or car GPS system for directions, SIAM highly recommends you contact the hotel directly or visit their website for driving directions. In many cases, the street address of the building and the address required for the GPS are different.