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Sound Transit Express (ST Express) is a network of regional express buses, operated by the multi-county transit agency, Sound Transit. The routes connect major regional hubs throughout 53 cities in three counties (King, Pierce, and Snohomish) in the Puget Sound region. Sound Transit Express ranks first in the nation in the number of commuter bus passengers carried and in vehicle miles driven.cite-ref-3[3] The first nine routes and 114 buses began carrying passengers on September 19, 1999.cite-ref-4[4]cite-ref-st-history-1997-2003-5-0[5] In 2024, the system had a ridership of 9,325,400, or about 30,000 per weekday as of the first quarter of 2025.

Unlike a typical transit bus, Sound Transit Express routes typically make limited stops as they travel longer distances on the freeways. Most routes operate seven days a week, with runs throughout the day. Where available, buses use transit-only lanes, high-occupancy vehicle lanes, high-occupancy toll lanes, express lanes, bus bypass shoulders,cite-ref-6[6] and direct access ramps to speed travel times.

While Sound Transit oversees, plans, and funds the service, operation and maintenance of the buses is contracted out to Community Transit (who subcontracts with Transdev), King County Metro and Pierce Transit.cite-ref-7[7]

• Fares

• Routes

• Fleet

• Retired fleet

• References

• External links

ST Express uses a flat fare system, where each ride costs the same regardless of distance.

The fares are as follows:

| Fare type | All |

|---|---|

| Adult | $3.25 |

| Senior (65+) / Disabled / Medicare (Reg… | $1.00 |

| Low-income (ORCA LIFT card required) | $1.00 |

| Youth (6–18 years) | Free |

| Children (0–5 years, with fare paying p… | Free |

Paper transfers are not accepted or issued on Sound Transit routes. Passengers who use ORCA may transfer between ST routes or routes operated by most other agencies within two hours of initial payment. If the fare for the second route is higher, the difference will be charged.

23 Sound Transit Express bus routes are overseen by the agency.cite-ref-stexpress-8-0[8] Buses are operated under contract by King County Metro, Pierce Transit and Community Transit (who subcontracts with Transdev).cite-ref-st-lostfound-9-0[9] When Sound Transit implements a new bus route, changes are frequently made to existing routes that serve the area to avoid overlapping.

The ST Express routes and operators as of September 14, 2024 are:cite-ref-10[10]

| Route | Off-peak service | Weekend service |

|---|---|---|

| 510 | No (use route 512) | No (use route 512) |

| 512 | Yes | Yes |

| 513 | No | No |

| 515 | No | No |

| 522 | Yes | Yes |

| 532 | No (use routes 535 & 512) | No |

| 535 | Yes | Saturday only |

| 542 | Yes | Yes |

| 545 | Yes | Yes |

| 550 | Yes | Yes |

| 554 | Yes | Yes |

| 556 | No | No |

| 560 | Yes | Yes |

| 566 | Yes | No |

| 574 | Yes | Yes |

| 577 | Yes | Yes |

| 578 | Yes | Yes |

| 580 | No | No |

| 586 | No | No |

| 590 | No (use route 594) | No (use route 594) |

| 592 | No | No |

| 594 | Yes | Yes |

| 595 | No | No |

| 596 | No | No |

| Route | Start | Via |

|---|---|---|

| 510 | Downtown Seattle | I-5 , South Everett Freeway Station, Mo… |

| 512 | Lynnwood City Center Station | Ash Way Park & Ride, South Everett Free… |

| 513 | Lynnwood City Center Station | Ash Way Park & Ride, Eastmont Park & Ri… |

| 515 | Lynnwood City Center Station | I-5, Mountlake Terrace Freeway Station |

| 522 | Roosevelt Station | Lake City Way, Bothell Way NE, Ballinge… |

| 532 | Downtown Bellevue | Bellevue Transit Center, Totem Lake Fre… |

| 535 | Downtown Bellevue | Bellevue Transit Center, Totem Lake Fre… |

| 542 | U District Station | University of Washington, University of… |

| 545 | Downtown Seattle | Capitol Hill (select trips) , Montlake… |

| 550 | Downtown Seattle | Mercer Island Park & Ride, South Bellev… |

| 554 | Downtown Seattle | Mercer Island Park & Ride, Eastgate Fre… |

| 556 | U District Station | University District (Seattle), Universi… |

| 560 | Bellevue Transit Center | Newport Hills Park & Ride, Kennydale Fr… |

| 566 | Remond Technology Station (select trips… | Bellevue Transit Center, Newport Hills… |

| 574 | Sea-Tac Airport | SeaTac/Airport Station, Kent/Des Moines… |

| 577 | Downtown Seattle | I-5 |

| 578 | Downtown Seattle | Federal Way Transit Center, Auburn Stat… |

| 580 | Puyallup Station | 9th St SW |

| 586 | University District (Seattle) | University of Washington Medical Center… |

| 590 | Downtown Seattle | SODO Busway, Tacoma Dome Station |

| 592 | Downtown Seattle | SR 512 Park & Ride, Lakewood Station |

| 594 | Downtown Seattle | SODO Busway, Tacoma Dome Station, Unive… |

| 595 | Downtown Seattle | SODO Busway, Tacoma Community College T… |

| 596 | Sumner Station | SR 410 |

| Route | End | Operator |

|---|---|---|

| 510 | Everett Station Downtown Everett (selec… | Community Transit |

| 512 | Everett Station Downtown Everett (selec… | Community Transit |

| 513 | Seaway Transit Center | Community Transit |

| 515 | Downtown Seattle | Community Transit |

| 522 | University of Washington, Bothell / Cas… | King County Metro |

| 532 | Everett Station | Community Transit |

| 535 | Lynnwood Transit Center | Community Transit |

| 542 | Redmond Transit Center | King County Metro |

| 545 | Bear Creek Park & Ride | King County Metro |

| 550 | Bellevue ( Library ) | King County Metro |

| 554 | Issaquah Highlands Park & Ride Redmond… | King County Metro |

| 556 | Issaquah Highlands Park & Ride | King County Metro |

| 560 | Westwood Village | Pierce Transit |

| 566 | Kent Station (select trips) Auburn Tran… | King County Metro |

| 574 | Lakewood Transit Center | Pierce Transit |

| 577 | Federal Way Transit Center | Pierce Transit |

| 578 | Puyallup Station | Pierce Transit |

| 580 | South Hill Park and Ride | Pierce Transit |

| 586 | Tacoma Dome Station | Pierce Transit |

| 590 | Tacoma Dome Station Downtown Tacoma (on… | Pierce Transit |

| 592 | DuPont Station | Pierce Transit |

| 594 | Lakewood Station DuPont Station (select… | Pierce Transit |

| 595 | Gig Harbor (Purdy Park & Ride) | Pierce Transit |

| 596 | Bonney Lake Park & Ride | |

Sound Transit owns a fleet of 360 busescite-ref-2015-draft-sip-12-0[12] operated by three different local transit agencies. Sound Transit buses are painted white with aqua, turquoise, and blue waves along the sides, representing the Puget Sound region ST Express serves, and most feature a freely-adapted representation of the Sound Transit bus and train system map on the seating fabric.

Occasionally, vehicles that are not in Sound Transit livery are used on Sound Transit routes by the operating agencies. Also, Sound Transit vehicles may also be used by the local agencies for other commuter routes. This is due to vehicles having mechanical problems, vehicle allocation issues, and assignment errors.

| Manufacturer and model | Length | Passengers | Purchased | Qty | Fleet Numbers |

|---|---|---|---|---|---|

| Gillig Phantom | 40' | 42 (seated) | 2007 | 22 | 9092–9113 |

| New Flyer DE60LF | 60' | 56 (seated) | 2007–2008 | 2 | 9622–9623 |

| New Flyer DE60LF | 60' | 56 (seated) | 2009 | 13 | 9624–9636 |

| Gillig Low Floor BRT Hybrid | 40' | 35 (seated) | 2008 | 22 | 9201–9222 |

| Motor Coach Industries D4500CL | 45' | 57 (seated) | 2008 | 7 | 9713–9719 |

| Motor Coach Industries D4500CL | 45' | 57 (seated) | 2009 | 3 | 9720–9722 |

| Motor Coach Industries D4500CL | 45' | 57 (seated) | 2010 | 17 | 9723–9739 |

| New Flyer D60LFR | 60' | 56 (seated) | 2010 | 13 | 9553–9565 |

| New Flyer D60LFR | 60' | 56 (seated) | 2011 | 1 | 9566 |

| New Flyer D60LFR | 60' | 56 (seated) | 2011 | 17 | 9567–9583 |

| New Flyer D60LFR | 60' | 56 (seated) | 2011 | 3 | 9584–9586 |

| New Flyer D60LFR | 60' | 56 (seated) | 2011 | 10 | 9587–9596 |

| New Flyer D60LFR | 60' | 56 (seated) | 2012 | 14 | 9800–9813 |

| New Flyer D60LFR | 60' | 56 (seated) | 2012 | 5 | 9818–9822 |

| New Flyer DE60LFR | 60' | 56 (seated) | 2010 | 11 | 9637–9647 |

| New Flyer DE60LFR | 60' | 56 (seated) | 2011 | 4 | 9648–9651 |

| Gillig Low Floor BRT Hybrid | 40' | 35 (seated) | 2012 | 22 | 9201–9222 |

| Gillig Low Floor BRT | 40' | 35 (seated) | 2012 | 2 | 9122–9123 |

| Gillig Low Floor BRT | 40' | 35 (seated) | 2015 | 3 | 9124–9126 |

| New Flyer Xcelsior XDE60 | 60' | 57 (seated) | 2014 | 8 | 9652–9659 |

| New Flyer Xcelsior XDE60 | 60' | 57 (seated) | 2014 | 7 | 61401–61407 |

| New Flyer Xcelsior XDE60 | 60' | 52 (Seated) | 2020 | 31 | 9660–9690 |

| New Flyer Xcelsior XD60 | 60' | 57 (seated) | 2014 | 4 | 9814–9817 |

| New Flyer Xcelsior XD60 | 60' | 57 (seated) | 2014 | 3 | 51401–51403 |

| Alexander Dennis Enviro500 MMC | 42' | 82 (seated) | 2015 | 5 | 91501–91505 |

| Alexander Dennis Enviro500 MMC | 42' | 82 (seated) | 2017 | 32 | 91701–91732 |

| Alexander Dennis Enviro500 MMC | 42' | 82 (seated) | 2020 | 13 | 91901–91913 |

| Gillig Low Floor BRTPlus CNG | 40' | 35 (seated) | 2015 | 17 | 41501–41517 |

| Gillig Low Floor BRTPlus CNG | 40' | 35 (seated) | 2016 | 5 | 41601–41605 |

| Motor Coach Industries D4500CT CNG | 45' | 57 (seated) | 2016 | 12 | 9301–9312 |

| Manufacturer and model | Operator |

|---|---|

| Gillig Phantom | Pierce Transit |

| New Flyer DE60LF | King County Metro |

| New Flyer DE60LF | King County Metro |

| Gillig Low Floor BRT Hybrid | Pierce Transit |

| Motor Coach Industries D4500CL | Pierce Transit |

| Motor Coach Industries D4500CL | Pierce Transit |

| Motor Coach Industries D4500CL | Pierce Transit |

| New Flyer D60LFR | Community Transit |

| New Flyer D60LFR | Community Transit |

| New Flyer D60LFR | King County Metro |

| New Flyer D60LFR | King County Metro |

| New Flyer D60LFR | King County Metro |

| New Flyer D60LFR | King County Metro |

| New Flyer D60LFR | King County Metro |

| New Flyer DE60LFR | King County Metro |

| New Flyer DE60LFR | King County Metro |

| Gillig Low Floor BRT Hybrid | Pierce Transit |

| Gillig Low Floor BRT | Pierce Transit |

| Gillig Low Floor BRT | Pierce Transit |

| New Flyer Xcelsior XDE60 | King County Metro |

| New Flyer Xcelsior XDE60 | Pierce Transit |

| New Flyer Xcelsior XDE60 | King County Metro |

| New Flyer Xcelsior XD60 | King County Metro |

| New Flyer Xcelsior XD60 | Pierce Transit |

| Alexander Dennis Enviro500 MMC | Community Transit |

| Alexander Dennis Enviro500 MMC | Community Transit |

| Alexander Dennis Enviro500 MMC | Community Transit |

| Gillig Low Floor BRTPlus CNG | Pierce Transit |

| Gillig Low Floor BRTPlus CNG | Pierce Transit |

| Motor Coach Industries D4500CT CNG | Pierce Transit |

| Manufacturer and model | Length | Passengers | Purchased | Retired | Qty |

|---|---|---|---|---|---|

| OBI Orion V CNG (05.501) | 40' | 42 | 1994 | 2008 | 27 |

| Breda DuoBus 350 (ADPB 350) Dual-mode | 60' | 63 | 1990 | 2005 | 20 |

| Gillig Phantom 40' | 40' | 42 | 1999 | 2014 | 70 |

| Gillig Phantom 40' | 40' | 42 | 2001 | 2014 | 20 |

| Gillig Phantom 40' | 40' | 42 | 2005 | 2020 | 2 |

| Gillig Phantom 40' | 40' | 42 | 2008 | 2020 | 8 |

| New Flyer DE40LF | 40' | 34 | 2003 | 2020 | 1 |

| New Flyer C40LF | 40' | 39 | 2001 | 2014 | 20 |

| New Flyer D60LF | 60' | 56 | 1999 | 2016 | 25 |

| New Flyer D60LF | 60' | 56 | 2000 | 2019 | 12 |

| New Flyer D60LF | 60' | 56 | 2004 | 2020 | 16 |

| New Flyer DE60LF | 60' | 56 | 2005 | 2020 | 22 |

| Motor Coach Industries D4500 | 45' | 57 (seated) | 2005 | 2022 | 13 |

| Manufacturer and model | Fleet Numbers |

|---|---|

| OBI Orion V CNG (05.501) | 801–827 |

| Breda DuoBus 350 (ADPB 350) Dual-mode | 5019–5021, 5194–5210 |

| Gillig Phantom 40' | 9000–9069 |

| Gillig Phantom 40' | 9070–9089 |

| Gillig Phantom 40' | 9090–9091 |

| Gillig Phantom 40' | 9114–9121 |

| New Flyer DE40LF | 9200 |

| New Flyer C40LF | 9400–9419 |

| New Flyer D60LF | 9500–9524 |

| New Flyer D60LF | 9525–9536 |

| New Flyer D60LF | 9537–9552 |

| New Flyer DE60LF | 9600–9621 |

| Motor Coach Industries D4500 | 9700–9712 |

| Manufacturer and model | Operator |

|---|---|

| OBI Orion V CNG (05.501) | Pierce Transit |

| Breda DuoBus 350 (ADPB 350) Dual-mode | King County Metro |

| Gillig Phantom 40' | King County Metro / Pierce Transit / Co… |

| Gillig Phantom 40' | King County Metro |

| Gillig Phantom 40' | King County Metro |

| Gillig Phantom 40' | Community Transit |

| New Flyer DE40LF | King County Metro |

| New Flyer C40LF | Pierce Transit |

| New Flyer D60LF | Pierce Transit / King County Metro / Co… |

| New Flyer D60LF | Community Transit / King County Metro |

| New Flyer D60LF | Community Transit / King County Metro /… |

| New Flyer DE60LF | King County Metro |

| Motor Coach Industries D4500 | Pierce Transit |

| Manufacturer and model | Notes |

|---|---|

| OBI Orion V CNG (05.501) | Ex-Pierce Transit; bought in 1998. Reti… |

| Breda DuoBus 350 (ADPB 350) Dual-mode | Leased from King County Metro Transit i… |

| Gillig Phantom 40' | Retired in 2014. |

| Gillig Phantom 40' | Replaced by New Flyer XDE60s. |

| Gillig Phantom 40' | Replaced by ADL Enviro500 MMC. |

| New Flyer DE40LF | Replaced by New FlyerXDE60s. |

| New Flyer C40LF | Replaced by Gillig CNG Low Floor BRT. |

| New Flyer DE60LF | Replaced by New Flyer XDE60s. |

cite-note-aptadaily-11. "Transit Ridership Report First Quarter 2025" (PDF). American Public Transportation Association. May 15, 2025. Retrieved July 12, 2025.

cite-note-apta-ridership-report-22. "Transit Ridership Report Fourth Quarter 2024" (PDF). American Public Transportation Association. February 19, 2025. Retrieved February 25, 2025.

cite-note-33. ↑ citerefrogoff2016Rogoff, Peter (January 29, 2016). "CEO Report for January 29, 2016". Sound Transit. Retrieved February 1, 2016.

cite-note-44. ↑ citerefcollins1999Collins, Eric (September 20, 1999). "Sound Transit's airport bus hits road". The News Tribune. pp. A1, A10. Retrieved November 24, 2022 – via Newspapers.com.

cite-note-st-history-1997-2003-55. ↑ "Regional transit history 1997 - 2003". Sound Transit. Retrieved March 11, 2017.

cite-note-66. ↑ citerefgutman2018Gutman, David (November 9, 2018). "Buses can avoid morning congestion by using I-5 shoulder lane in Snohomish County". The Seattle Times. Retrieved June 24, 2023.

cite-note-77. ↑ citerefjohnson2015Johnson, Matthew (December 10, 2015). "Q. Who's driving those Sound Transit buses and trains?". The Platform. Sound Transit. Retrieved June 1, 2021.

cite-note-stexpress-88. ↑ "Sound Transit: ST Express Regional Bus Service". Sound Transit. Retrieved November 10, 2009.

cite-note-st-lostfound-99. ↑ "Lost and found". Sound Transit. Retrieved October 3, 2021.

cite-note-1010. ↑ "Sound Transit announces March 2024 Service Change" (Press release). Sound Transit. March 22, 2024. Retrieved March 30, 2024.

cite-note-113. "Montlake Freeway Station closure begins June 22, 2019" (PDF). Washington State Department of Transportation. May 2019. Retrieved November 24, 2022.

cite-note-2015-draft-sip-1212. ↑ "Draft 2015 Service Implementation Plan - Appendix B: Fleet Plans" (PDF). Sound Transit. p. 111. Archived from the original (PDF) on November 8, 2014. Retrieved November 8, 2014.

cite-note-motion2009-15-134. "MOTION NO. M2009-15: Contract with New Flyer Corporation" (PDF). Sound Transit. 2009. Archived from the original (PDF) on June 20, 2010. Retrieved July 23, 2009.

cite-note-m2011-04sr-145. "MOTION NO. M2011-04 Purchase 24 Forty-Foot Replacement Buses" (PDF). Sound Transit. February 24, 2011. Retrieved February 25, 2011.

cite-note-45ft-156. "ST Express 45-foot Long-Haul Bus Specifications (MCI)". Sound Transit. Archived from the original on September 19, 2007. Retrieved May 19, 2007.

cite-note-2011-02-24-167. "Sound Transit: Sound Transit board approves purchase of clean diesel and hybrid buses". Sound Transit. February 24, 2011. Archived from the original on February 28, 2011. Retrieved February 24, 2011.

cite-note-motion2010-01-178. "MOTION NO. M2010-01: ST Express Bus Procurement – ST2 Expansion Service" (PDF). Sound Transit. January 14, 2010. Archived from the original (PDF) on June 20, 2010. Retrieved January 18, 2010.

cite-note-m2014-06-189. "MOTION NO. M2014-06" (PDF). March 27, 2014. Retrieved December 31, 2015.

cite-note-motion2009-09-1910. "MOTION NO. M2009-09: Contract with Motor Coach Industries" (PDF). Sound Transit. Archived from the original (PDF) on June 20, 2010. Retrieved July 23, 2009.

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