| Box Width: | 250 |
| Number: | F Line |
| Titlecolor: | white |
| System: | RapidRide |
| Operator: | King County Metro |
| Garage: | South Base |
| Vehicle: | New Flyer articulated buses |
| Open: | June 7, 2014 |
| Predecessors: | Routes 110, 140 |
| Locale: | King County |
| Communities: | Burien, SeaTac, Tukwila, Renton |
| Landmarks: | Tukwila International Boulevard station, Southcenter Mall, Tukwila station, South Renton Park and Ride, Renton Transit Center, Boeing Renton Factory |
| Start: | Burien Transit Center |
| Via: | 4th Ave SW SW 156th St S 154th St Southcenter Blvd Andover Park W Strander Blvd West Valley Hwy Oakesdale Ave SW SW 16th St Lind Ave SW SW 7th St Rainier Ave S S 2nd St/S 3rd St Logan Ave N |
| End: | The Landing in Renton |
| Length: | 12.8miles |
| Frequency: | Peak: 10 minutes Off-peak: 15 minutes Nights: 30 minutes |
| Alt Frequency: | 15 minutes (most times) |
| Time: | 55 minutes |
| Day: | Weekdays: 4:45 am - 12:00 am Weekends: 6:00 am - 12:00 am |
| Ridership: | 5,600 (June 2015) |
| Timetable Link: | F Line timetable |
| Map Link: | F Line map |
| Map State: | show |
| Map Name: | Route diagram |
| Previous Line: | E Line |
The F Line is one of seven RapidRide lines (routes with some bus rapid transit features) operated by King County Metro in King County, Washington. The F Line began service on June 7, 2014,[1] running between the Burien Transit Center and "The Landing" in north Renton. Other major stops and destinations served include Tukwila International Boulevard Link Station, Southcenter Mall, Tukwila Sounder/Amtrak Station, South Renton Park and Ride, Renton Transit Center and the Boeing Renton Factory.[2] Unlike most of the RapidRide lines, the F Line does not offer scheduled service during late-night and early morning hours.[2]
This corridor was previously served by Metro routes 110 and 140, with the latter carrying 3,500 riders on an average weekday in April 2014 [3] With the implementation of RapidRide, the corridor saw an overall 69 percent increase in service, and ridership has grown 47 percent, with the F Line serving an average of 5,600 riders on weekdays in June 2015.[4]
| 4:45 am – 6:00 am | 15 | No Service | |
| 6:00 am – 8:00 am | 10 | 30 | |
| 8:00 am – 9:00 am | 10 | 15 | |
| 9:00 am – 3:00 pm | 15 | 15 | |
| 3:00 pm – 6:00 pm | 10 | 15 | |
| 6:00 pm – 8:00 pm | 15 | 15 | |
| 8:00 pm – 12:00 am | 30 | 30 | |
| 12:00 am – 4:45 am | No Service | No Service |
All times are estimated headways.