Hotel and Transportation Information

ACM-SIAM Symposium on Discrete Algorithms (SODA22)

Hotel & Transportation Information

Hotel Reservation Deadline

Hotel Reservation Deadline

December 6, 2021



The Westin Alexandria Old Town

400 Courthouse Square Alexandria, Virginia 22314-5700 U.S.
Phone: +1-703-253-8600
Toll free Reservations (USA and Canada): 888-236-2427

Government Rate

Government employees are encouraged to reserve a room in the conference block at the group rate of $120. The negotiated group rate is below the standard GSA rates.

Student ID must be presented upon check-in. SIAM has negotiated a limited number of reduced rate rooms for students. Please book early as these rooms sell out quickly!

Other Hotels


Conference Location

The Westin Alexandria Old Town
400 Courthouse Square Alexandria, Virginia 22314-5700 U.S.
Phone: +1-703-253-8600
Toll Free Phone: 888-236-2427


Discounted rates of $18 per night apply for conference attendees.

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 seamlessly discover first-class attractions at National Harbor and Washington, D.C. After navigating through Old Town, relax and recharge at the upscale hotel. Lounge 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 arises, delight in the convenience of the 24-hour room service, and savor carefully crafted American cuisine at the on-site restaurant.

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. At this time, 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 on a daily basis, 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 PM local time on the cutoff date 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 – Monday, December 6, 2021  (or until the room block is filled)
Single/Double Room Rate*: $120 per night plus 14.5% tax
Student Rate: $94 per night plus 14.5% tax 
Student ID must be presented upon check-in. SIAM is able to negotiate 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).

In order to receive the SIAM rate, please 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
SIAM encourages the use of the reservation links in order to avoid longer than usual telephone wait times. Please be patient if you do chose to reserve by phone.

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.

COVID-19 Hotel Policy

Further information regarding the Westin Alexandria Old Town’s COVID-19 policies can be found at


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

Health Facilities

Hotel guests will have complimentary use of the fitness center.

Telephone Messages

The hotel operator can be reached at +1-703-253-8600. Telephone messages can be left in guest rooms for guests staying in the hotel.


By Air
SIAM has selected Wings Travel to assist attendees in making travel arrangements. To book your reservations through Wings Travel, contact the Corporate Team at +1-215-628-3322 or toll free (US and Canada) at 800-243-4370 and press one (1) when you hear the recording, or email your requests to [email protected]. Be sure to reference the ACM-SIAM Symposium on Discrete Algorithms (SODA22). Wings Travel will issue your ticket and email it to you. Please be aware there is a fee for this service.

You also have the choice of using your own travel agent or an internet service. There are many websites available to allow you to search for and purchase airline tickets online. Expedia, Orbitz, and Travelocity are just a few.

Public Transportation from Airport
Taxis are available at the airport for transportation to the hotel. Please visit the Westin Alexandria Old Town website and click on “Map” to find local directions. SIAM also suggests you contact the hotel directly for any information about sharing transportation. Additional ground transportation information is available on the Washington Dulles International Airport (IAD) website.

By Train
Amtrak has a rail station in Alexandria. To make train reservations through Amtrak, call (800) USA-RAIL, go to or contact Wings Travel. 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 Wings Travel or your own travel agent. Wings Travel can make your car rental reservations at the same time you make your flight reservations. See information above regarding how to reach Wings Travel.

Driving Directions
If renting a car, please obtain a map and directions from your rental car company. Another option is to visit Google Maps, or another similar website. SIAM highly recommends you contact the hotel directly at +1-703-253-8600 or visit their website for driving directions.

Hotel Room Sharing Form

The hotel room sharing form is now available.