- Saver Award
- Screenshot or It Didn’t Happen
- SDC
- SEA (Seattle-Tacoma)
- Seatback Tap Signal
- Seat Encroachment
- Seat Map Obsession
- Seat Map Stalking
- Seat Squatter
- Security Shuffle
- Segment
- Serve
- S Fare
- SFO (San Francisco International)
- Shadow Devaluation
- SHARES
- Shopping Portal
- shuffle foot
- Shugyō (修行)
- Shutdown
- Simon Mall Play
- SIN (Singapore Changi)
- Skiplagging
- SkyMiles
- SkyPesos
- SkyTeam (ST)
- SLF (Self-Loading Freight)
- Slot Controlled Airport
- Sock Drawer
- Soft Pull (SP)
- Southwest Companion Pass
- Speaker Seater
- Speculative Booker
- Speculative Transfer
- Spend Bonus
- Split Tender
- Spoonfeeding
- Spreadsheet Drift
- SQ (Singapore Airlines)
- SSSS (Secondary Security Screening Selection)
- Stacker
- Starwood Lurker
- Statement Credit (SC)
- Status Gravity
- Status Match
- Status Math
- Statusmaxxer
- Status Rebound
- Status Run
- Status Withdrawal
- Steve Belkin
- Stopover
- STW
- SUA (Systemwide Upgrade Award)
- SUB
- SUB Chaser
- Suite Night Award (SNA)
- Suite Talk
- Suite Upgrade Award (SUA)
- SWABrian
- Sweet Spot
- Sweet Spot Chaser
- Sweet Spot Fever
- SYD (Sydney Kingsford Smith)
