OP23 Hotel & Transportation Information | SIAM

Hotel and Transportation Information

SIAM Conference on Optimization (OP23)

Hotel & Transportation Information

Hotel Reservation Deadline

Hotel Reservation Deadline

May 3, 2023



The Sheraton Grand Seattle

1400 6th Avenue, Seattle, Washington 98101, U.S.
Phone: +1-206-621-9000
Toll free Reservations (USA and Canada): 888-627-7056


Student Rate
$134.25++* 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 $179. 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!

Welcome Reception
When making your hotel reservation, remember the Welcome Reception is scheduled for Tuesday, May 30. This is an excellent networking opportunity!

Other Hotels


Conference Location

The Sheraton Grand Seattle
1400 6th Avenue, Seattle, Washington 98101, U.S.
Phone: +1-206-621-9000
Toll Free Phone: 888-627-7056


Posted rates apply

Transportation Information

Additional Information

Hotel Location

Stay in the heart of downtown Seattle, WA at Sheraton Grand Seattle. Centrally located at 6th and Pike St., the newly renovated hotel is walking distance to Seattle's most iconic local attractions, shopping and dining, including Pike Place Market. As one of only seven Sheraton Grand hotels in North America, the Grand designation ensures guests are receiving the highest benchmark on product and service offerings available. Start your day in downtown Seattle at the modern Starbucks® marketplace and upscale coffee bar and order dinner comfortably in your room from the A La Carte service. Relax in newly refreshed pet-friendly rooms with views of downtown Seattle or Puget Sound. Visit shops, restaurants bars and attractions just blocks from the hotel, such as the Space Needle, Climate Pledge Arena & Chihuly Garden & Glass. We look forward to making your stay in Seattle, WA truly memorable.

Did you know?

Your support in staying at the Sheraton Grand Seattle 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 Sheraton Grand Seattle. 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. 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 – May 3, 2023 (or until the room block is filled)

Single/Double Room Rate*                      $179 per night plus 15.70% tax plus $2.00 per room night
City Tax
Student Rate                                             $134.25 per night plus 15.70% tax plus $2.00 per room night Student rate rooms are SOLD OUT.
City 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 $25 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): 888-627-7056
Direct Telephone Number: +1-206-621-9000
If you are registering at the Student Rate, please identify as such when calling.

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 Sheraton Grand Seattle COVID-19 policies can be found here.


If you need to change or cancel your reservation, you must contact the hotel 72 hours in advance of the scheduled arrival date to avoid a cancellation fee. You can contact the hotel at 888-627-7056 (U.S. and Canada) or +1-206-621-9000. 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 Sheraton Grand Seattle 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 +1-206-621-9000. Telephone messages can be left in guest rooms for guests staying in the hotel.


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 visit the The Sheraton Grand Seattle website and click on “View 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 Seattle-Tacoma International Airport website.

By Train
Amtrak has a rail station in Seattle. To make train reservations through Amtrak, call (800) USA-RAIL, go to http://www.amtrak.com 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 (https://maps.google.com), or another similar website. SIAM highly recommends you contact the hotel directly at +1-206-621-9000 or visit their website for driving directions.