Southwest Airlines Flight Status
About Southwest Airlines
Southwest Airlines, based in United States, operates under the ICAO code SWA and the IATA code WN; its radio callsign is "Southwest". On this page you can follow Southwest Airlines flights and find the airports it serves.
How to read a Southwest Airlines flight number
Every Southwest Airlines flight number starts with WN, followed by up to four digits: that is the number on your booking confirmation and boarding pass. In flight plans the same flight carries the ICAO prefix SWA, and controllers address it as "Southwest". One thing to watch: codeshares. A ticket sold by another airline can be operated by Southwest Airlines and vice versa; live tracking follows the operating carrier's number, so if your search comes up empty, check the "operated by" line on your booking.
Southwest Airlines flights we tracked
Over the first 92 days of our own live tracking we logged 20504 aircraft movements operated by Southwest Airlines. These figures are refreshed weekly. Tracking data: adsb.lol · Route data: adsbdb.com.
Routes we tracked on Southwest Airlines
| # | Route | Tracked flights |
|---|---|---|
| 1 | San Diego (SAN) → San Jose (SJC) | 278 |
| 2 | San Diego (SAN) → Oakland (OAK) | 277 |
| 3 | San Jose (SJC) → San Diego (SAN) | 259 |
| 4 | Burbank (BUR) → Oakland (OAK) | 244 |
| 5 | Las Vegas (LAS) → Oakland (OAK) | 237 |
| 6 | Santa Ana (SNA) → Oakland (OAK) | 214 |
| 7 | Burbank (BUR) → San Jose (SJC) | 209 |
| 8 | San Jose (SJC) → Las Vegas (LAS) | 208 |
| 9 | Oakland (OAK) → Burbank (BUR) | 169 |
| 10 | San Jose (SJC) → Burbank (BUR) | 165 |
| 11 | Los Angeles (LAX) → Oakland (OAK) | 160 |
| 12 | Oakland (OAK) → Las Vegas (LAS) | 157 |
| 13 | San Jose (SJC) → Santa Ana (SNA) | 154 |
| 14 | Baltimore (BWI) → Boston (BOS) | 150 |
| 15 | San Jose (SJC) → Los Angeles (LAX) | 131 |
| 16 | San Jose (SJC) → Portland (PDX) | 125 |
| 17 | Santa Ana (SNA) → San Jose (SJC) | 124 |
| 18 | Las Vegas (LAS) → San Jose (SJC) | 124 |
| 19 | Seattle (SEA) → Oakland (OAK) | 124 |
| 20 | Long Beach (LGB) → Oakland (OAK) | 116 |
| 21 | Baltimore (BWI) → Manchester (MHT) | 112 |
| 22 | Los Angeles (LAX) → San Jose (SJC) | 105 |
| 23 | Burbank (BUR) → San Francisco (SFO) | 102 |
| 24 | Boston (BOS) → Baltimore (BWI) | 101 |
| 25 | Phoenix (PHX) → Oakland (OAK) | 101 |
| 26 | Ontario (ONT) → Oakland (OAK) | 100 |
| 27 | San Jose (SJC) → Denver (DEN) | 98 |
| 28 | Baltimore (BWI) → Albany (ALB) | 94 |
| 29 | San Jose (SJC) → Seattle (SEA) | 93 |
| 30 | Denver (DEN) → Oakland (OAK) | 88 |
| 31 | Las Vegas (LAS) → San Francisco (SFO) | 85 |
| 32 | Dallas (DAL) → New York (LGA) | 84 |
| 33 | Los Angeles (LAX) → San Francisco (SFO) | 83 |
| 34 | Chicago (MDW) → Boston (BOS) | 82 |
| 35 | Baltimore (BWI) → Portland (PWM) | 81 |
| 36 | Oakland (OAK) → Los Angeles (LAX) | 80 |
| 37 | San Diego (SAN) → San Francisco (SFO) | 80 |
| 38 | Portland (PDX) → Oakland (OAK) | 78 |
| 39 | Nashville (BNA) → New York (LGA) | 78 |
| 40 | Phoenix (PHX) → San Jose (SJC) | 77 |
| 41 | Phoenix (PHX) → San Francisco (SFO) | 77 |
| 42 | Chicago (MDW) → Philadelphia (PHL) | 76 |
| 43 | Ontario (ONT) → San Jose (SJC) | 75 |
| 44 | Philadelphia (PHL) → Chicago (MDW) | 73 |
| 45 | Baltimore (BWI) → Hartford (BDL) | 73 |
| 46 | Orlando (MCO) → New Orleans (MSY) | 73 |
| 47 | Oakland (OAK) → Phoenix (PHX) | 73 |
| 48 | Portland (PDX) → San Jose (SJC) | 73 |
| 49 | San Jose (SJC) → Phoenix (PHX) | 72 |
| 50 | Seattle (SEA) → San Jose (SJC) | 69 |
| 51 | Atlanta (ATL) → New York (LGA) | 68 |
| 52 | Denver (DEN) → San Francisco (SFO) | 68 |
| 53 | San Francisco (SFO) → Las Vegas (LAS) | 67 |
| 54 | Albany (ALB) → Baltimore (BWI) | 66 |
| 55 | Providence (PVD) → Baltimore (BWI) | 65 |
| 56 | Chicago (MDW) → Orlando (MCO) | 65 |
| 57 | Houston (HOU) → New York (LGA) | 65 |
| 58 | Boston (BOS) → St Louis (STL) | 65 |
| 59 | Palm Springs (PSP) → Oakland (OAK) | 64 |
| 60 | Boise (BOI) → Oakland (OAK) | 64 |
| 61 | San Francisco (SFO) → Burbank (BUR) | 63 |
| 62 | St Louis (STL) → Boston (BOS) | 61 |
| 63 | Portland (PWM) → Baltimore (BWI) | 61 |
| 64 | Denver (DEN) → Austin (AUS) | 61 |
| 65 | Islip (ISP) → Baltimore (BWI) | 61 |
| 66 | Oakland (OAK) → Portland (PDX) | 60 |
| 67 | St Louis (STL) → New York (LGA) | 59 |
| 68 | Oakland (OAK) → Ontario (ONT) | 58 |
| 69 | San Jose (SJC) → Boise (BOI) | 58 |
| 70 | Chicago (MDW) → New Orleans (MSY) | 58 |
| 71 | Denver (DEN) → San Jose (SJC) | 55 |
| 72 | Baltimore (BWI) → Providence (PVD) | 55 |
| 73 | Denver (DEN) → Boston (BOS) | 55 |
| 74 | Manchester (MHT) → Baltimore (BWI) | 55 |
| 75 | Oakland (OAK) → Santa Ana (SNA) | 55 |
| 76 | Hartford (BDL) → Baltimore (BWI) | 54 |
| 77 | San Francisco (SFO) → San Diego (SAN) | 51 |
| 78 | Phoenix (PHX) → Austin (AUS) | 51 |
| 79 | Baltimore (BWI) → Buffalo (BUF) | 50 |
| 80 | San Jose (SJC) → Austin (AUS) | 50 |
| 81 | Orlando (MCO) → Chicago (MDW) | 49 |
| 82 | San Jose (SJC) → Long Beach (LGB) | 49 |
| 83 | Nashville (BNA) → Boston (BOS) | 49 |
| 84 | Salt Lake City (SLC) → Denver (DEN) | 48 |
| 85 | Oakland (OAK) → Seattle (SEA) | 48 |
| 86 | Manchester (MHT) → Chicago (MDW) | 48 |
| 87 | Phoenix (PHX) → Denver (DEN) | 47 |
| 88 | Oakland (OAK) → Palm Springs (PSP) | 47 |
| 89 | Las Vegas (LAS) → Burbank (BUR) | 47 |
| 90 | Nashville (BNA) → Dallas (DAL) | 46 |
| 91 | San Francisco (SFO) → Phoenix (PHX) | 45 |
| 92 | Boston (BOS) → Chicago (MDW) | 45 |
| 93 | Nashville (BNA) → Chicago (MDW) | 45 |
| 94 | New York (LGA) → Chicago (MDW) | 45 |
| 95 | Ontario (ONT) → Las Vegas (LAS) | 45 |
| 96 | Denver (DEN) → New York (LGA) | 44 |
| 97 | Baltimore (BWI) → Tampa (TPA) | 44 |
| 98 | Las Vegas (LAS) → Austin (AUS) | 44 |
| 99 | Nashville (BNA) → Philadelphia (PHL) | 44 |
| 100 | Oakland (OAK) → San Diego (SAN) | 44 |
| 101 | Denver (DEN) → Las Vegas (LAS) | 43 |
| 102 | Boston (BOS) → Denver (DEN) | 43 |
| 103 | New York (LGA) → Atlanta (ATL) | 42 |
| 104 | Dallas (DAL) → Chicago (MDW) | 42 |
| 105 | San Diego (SAN) → Las Vegas (LAS) | 41 |
| 106 | Phoenix (PHX) → Dallas (DAL) | 41 |
| 107 | San Jose (SJC) → Ontario (ONT) | 40 |
| 108 | Atlanta (ATL) → Denver (DEN) | 40 |
| 109 | Nashville (BNA) → Tampa (TPA) | 40 |
| 110 | Las Vegas (LAS) → Denver (DEN) | 40 |
| 111 | Baltimore (BWI) → Cincinnati / Covington (CVG) | 39 |
| 112 | Atlanta (ATL) → New Orleans (MSY) | 39 |
| 113 | Austin (AUS) → San Jose (SJC) | 38 |
| 114 | Washington (DCA) → Providence (PVD) | 38 |
| 115 | San Diego (SAN) → Austin (AUS) | 38 |
| 116 | Columbus (CMH) → Chicago (MDW) | 38 |
| 117 | Denver (DEN) → Chicago (ORD) | 37 |
| 118 | Cincinnati / Covington (CVG) → Chicago (MDW) | 37 |
| 119 | Chicago (MDW) → Minneapolis (MSP) | 37 |
| 120 | St Louis (STL) → Chicago (MDW) | 37 |
| 121 | Austin (AUS) → Oakland (OAK) | 37 |
| 122 | St Louis (STL) → Philadelphia (PHL) | 37 |
| 123 | Santa Ana (SNA) → Denver (DEN) | 36 |
| 124 | New York (LGA) → Houston (HOU) | 36 |
| 125 | Las Vegas (LAS) → Bellingham (BLI) | 36 |
| 126 | Long Beach (LGB) → San Jose (SJC) | 35 |
| 127 | Reno (RNO) → Las Vegas (LAS) | 35 |
| 128 | Philadelphia (PHL) → St Louis (STL) | 35 |
| 129 | Chicago (MDW) → St Louis (STL) | 35 |
| 130 | Sacramento (SMF) → Las Vegas (LAS) | 35 |
| 131 | Burbank (BUR) → Las Vegas (LAS) | 34 |
| 132 | San Francisco (SFO) → Los Angeles (LAX) | 34 |
| 133 | Orlando (MCO) → Baltimore (BWI) | 33 |
| 134 | Oakland (OAK) → Reno (RNO) | 33 |
| 135 | Las Vegas (LAS) → Phoenix (PHX) | 33 |
| 136 | San Jose (SJC) → Honolulu (HNL) | 33 |
| 137 | Chicago (MDW) → Oakland (OAK) | 33 |
| 138 | Baltimore (BWI) → New Orleans (MSY) | 33 |
| 139 | San Diego (SAN) → Sacramento (SMF) | 32 |
| 140 | San Jose (SJC) → Kahului (OGG) | 32 |
| 141 | Denver (DEN) → Nashville (BNA) | 32 |
| 142 | St Louis (STL) → Dallas (DAL) | 32 |
| 143 | Los Angeles (LAX) → Las Vegas (LAS) | 32 |
| 144 | Omaha (OMA) → Chicago (MDW) | 32 |
| 145 | New Orleans (MSY) → Dallas (DAL) | 32 |
| 146 | Burbank (BUR) → Phoenix (PHX) | 32 |
| 147 | Chicago (MDW) → Albany (ALB) | 32 |
| 148 | Chicago (MDW) → Omaha (OMA) | 32 |
| 149 | Austin (AUS) → New Orleans (MSY) | 31 |
| 150 | Albany (ALB) → Orlando (MCO) | 31 |
| 151 | Chicago (MDW) → Providence (PVD) | 31 |
| 152 | Orlando (MCO) → Manchester (MHT) | 31 |
| 153 | Baltimore (BWI) → Syracuse (SYR) | 30 |
| 154 | Baltimore (BWI) → Orlando (MCO) | 30 |
| 155 | Chicago (MDW) → Cincinnati / Covington (CVG) | 30 |
| 156 | Baltimore (BWI) → Fort Lauderdale (FLL) | 30 |
| 157 | Chicago (MDW) → Washington (DCA) | 30 |
| 158 | Houston (HOU) → Oakland (OAK) | 30 |
| 159 | Denver (DEN) → Orlando (MCO) | 30 |
| 160 | St Louis (STL) → Tampa (TPA) | 29 |
| 161 | Dallas (DAL) → Houston (HOU) | 29 |
| 162 | Austin (AUS) → Chicago (MDW) | 29 |
| 163 | Boston (BOS) → Nashville (BNA) | 29 |
| 164 | Chicago (MDW) → Hartford (BDL) | 29 |
| 165 | Chicago (MDW) → Baltimore (BWI) | 29 |
| 166 | Hartford (BDL) → Chicago (MDW) | 29 |
| 167 | Manchester (MHT) → Orlando (MCO) | 29 |
| 168 | Oakland (OAK) → Denver (DEN) | 28 |
| 169 | Tampa (TPA) → New Orleans (MSY) | 28 |
| 170 | St Louis (STL) → Atlanta (ATL) | 28 |
| 171 | Austin (AUS) → Orlando (MCO) | 28 |
| 172 | Kahului (OGG) → San Jose (SJC) | 28 |
| 173 | Philadelphia (PHL) → Nashville (BNA) | 28 |
| 174 | San Jose (SJC) → Dallas (DAL) | 28 |
| 175 | Oakland (OAK) → Houston (HOU) | 28 |
| 176 | Orlando (MCO) → Columbus (CMH) | 28 |
| 177 | Islip (ISP) → Nashville (BNA) | 28 |
| 178 | Orlando (MCO) → Milwaukee (MKE) | 28 |
| 179 | Baltimore (BWI) → Dallas (DAL) | 28 |
| 180 | Phoenix (PHX) → Chicago (MDW) | 28 |
| 181 | Indianapolis (IND) → Fort Myers (RSW) | 27 |
| 182 | Kansas City (MCI) → New York (LGA) | 27 |
| 183 | Santa Ana (SNA) → Phoenix (PHX) | 27 |
| 184 | Cincinnati / Covington (CVG) → Baltimore (BWI) | 27 |
| 185 | San Jose (SJC) → Spokane (GEG) | 27 |
| 186 | Kansas City (MCI) → Denver (DEN) | 27 |
| 187 | New Orleans (MSY) → Orlando (MCO) | 27 |
| 188 | Chicago (MDW) → Denver (DEN) | 27 |
| 189 | Denver (DEN) → Des Moines (DSM) | 27 |
| 190 | Providence (PVD) → Chicago (MDW) | 27 |
| 191 | San Jose (SJC) → Salt Lake City (SLC) | 27 |
| 192 | Baltimore (BWI) → Denver (DEN) | 27 |
| 193 | Sacramento (SMF) → Burbank (BUR) | 27 |
| 194 | Buffalo (BUF) → Fort Myers (RSW) | 27 |
| 195 | Chicago (MDW) → Louisville (SDF) | 26 |
| 196 | Albany (ALB) → Chicago (MDW) | 26 |
| 197 | Houston (HOU) → Dallas (DAL) | 26 |
| 198 | Dallas (DAL) → Washington (DCA) | 26 |
| 199 | Atlanta (ATL) → Philadelphia (PHL) | 26 |
| 200 | Washington (DCA) → Dallas (DAL) | 26 |
| 201 | Kahului (OGG) → Oakland (OAK) | 26 |
| 202 | Milwaukee (MKE) → Orlando (MCO) | 26 |
| 203 | Washington (DCA) → Chicago (MDW) | 26 |
| 204 | Dallas (DAL) → New Orleans (MSY) | 26 |
| 205 | Baltimore (BWI) → Kansas City (MCI) | 25 |
| 206 | Portland (PDX) → Denver (DEN) | 25 |
| 207 | Baltimore (BWI) → New York (LGA) | 25 |
| 208 | New York (LGA) → Nashville (BNA) | 25 |
| 209 | Spokane (GEG) → San Jose (SJC) | 25 |
| 210 | New Orleans (MSY) → Denver (DEN) | 25 |
| 211 | New York (LGA) → Dallas (DAL) | 25 |
| 212 | Phoenix (PHX) → Chicago (ORD) | 25 |
| 213 | Denver (DEN) → Houston (IAH) | 25 |
| 214 | Salt Lake City (SLC) → Oakland (OAK) | 25 |
| 215 | Baltimore (BWI) → Jacksonville (JAX) | 25 |
| 216 | Baltimore (BWI) → Milwaukee (MKE) | 25 |
| 217 | Denver (DEN) → Philadelphia (PHL) | 25 |
| 218 | Chicago (MDW) → Columbus (CMH) | 25 |
| 219 | Baltimore (BWI) → Indianapolis (IND) | 24 |
| 220 | Tampa (TPA) → Providence (PVD) | 24 |
| 221 | Fort Lauderdale (FLL) → Chicago (MDW) | 24 |
| 222 | Denver (DEN) → Portland (PDX) | 24 |
| 223 | Cleveland (CLE) → Baltimore (BWI) | 24 |
| 224 | Chicago (MDW) → Pittsburgh (PIT) | 24 |
| 225 | Chicago (MDW) → New York (LGA) | 24 |
| 226 | Las Vegas (LAS) → San Diego (SAN) | 23 |
| 227 | Atlanta (ATL) → Chicago (MDW) | 23 |
| 228 | Chicago (MDW) → Cleveland (CLE) | 23 |
| 229 | New Orleans (MSY) → Chicago (MDW) | 23 |
| 230 | Orlando (MCO) → Albany (ALB) | 23 |
| 231 | Tampa (TPA) → Chicago (ORD) | 23 |
| 232 | Baltimore (BWI) → Las Vegas (LAS) | 23 |
| 233 | San Diego (SAN) → Phoenix (PHX) | 23 |
| 234 | Las Vegas (LAS) → Baltimore (BWI) | 23 |
| 235 | Providence (PVD) → Orlando (MCO) | 23 |
| 236 | Honolulu (HNL) → Oakland (OAK) | 22 |
| 237 | New Orleans (MSY) → Houston (HOU) | 22 |
| 238 | Phoenix (PHX) → Santa Ana (SNA) | 22 |
| 239 | Spokane (GEG) → Oakland (OAK) | 22 |
| 240 | New York (LGA) → St Louis (STL) | 22 |
| 241 | Oakland (OAK) → Bellingham (BLI) | 22 |
| 242 | Tampa (TPA) → Columbus (CMH) | 22 |
| 243 | Kansas City (MCI) → Dallas (DAL) | 22 |
| 244 | Chicago (MDW) → Las Vegas (LAS) | 22 |
| 245 | Las Vegas (LAS) → Sacramento (SMF) | 22 |
| 246 | Sacramento (SMF) → Nashville (BNA) | 22 |
| 247 | Albuquerque (ABQ) → Oakland (OAK) | 21 |
| 248 | Baltimore (BWI) → Charleston (CHS) | 21 |
| 249 | Oakland (OAK) → Long Beach (LGB) | 21 |
| 250 | Providence (PVD) → Tampa (TPA) | 21 |
| 251 | Oakland (OAK) → Salt Lake City (SLC) | 21 |
| 252 | Louisville (SDF) → Tampa (TPA) | 21 |
| 253 | Washington (DCA) → New Orleans (MSY) | 21 |
| 254 | Dallas (DAL) → Las Vegas (LAS) | 21 |
| 255 | Baltimore (BWI) → Austin (AUS) | 21 |
| 256 | Milwaukee (MKE) → Phoenix (PHX) | 21 |
| 257 | Chicago (MDW) → Kansas City (MCI) | 20 |
| 258 | Chicago (MDW) → Tampa (TPA) | 20 |
| 259 | Reno (RNO) → Oakland (OAK) | 20 |
| 260 | St Louis (STL) → Phoenix (PHX) | 20 |
| 261 | El Paso (ELP) → Austin (AUS) | 20 |
| 262 | Phoenix (PHX) → Baltimore (BWI) | 20 |
| 263 | Minneapolis (MSP) → Chicago (MDW) | 20 |
| 264 | Nashville (BNA) → Detroit (DTW) | 20 |
| 265 | Philadelphia (PHL) → Denver (DEN) | 20 |
| 266 | Atlanta (ATL) → Baltimore (BWI) | 20 |
| 267 | Las Vegas (LAS) → Kansas City (MCI) | 20 |
| 268 | Denver (DEN) → Washington (IAD) | 20 |
| 269 | Phoenix (PHX) → Oklahoma City (OKC) | 20 |
| 270 | Chicago (MDW) → San Jose (SJC) | 20 |
| 271 | Chicago (MDW) → Atlanta (ATL) | 20 |
| 272 | Nashville (BNA) → Milwaukee (MKE) | 20 |
| 273 | Dallas (DAL) → Denver (DEN) | 19 |
| 274 | Denver (DEN) → San Diego (SAN) | 19 |
| 275 | St Louis (STL) → Jacksonville (JAX) | 19 |
| 276 | Denver (DEN) → Phoenix (PHX) | 19 |
| 277 | Chicago (ORD) → Orlando (MCO) | 19 |
| 278 | Indianapolis (IND) → Orlando (MCO) | 19 |
| 279 | Baltimore (BWI) → Atlanta (ATL) | 19 |
| 280 | Denver (DEN) → Sacramento (SMF) | 19 |
| 281 | St Louis (STL) → Denver (DEN) | 19 |
| 282 | Fort Myers (RSW) → St Louis (STL) | 19 |
| 283 | Orlando (MCO) → Atlanta (ATL) | 19 |
| 284 | Fort Myers (RSW) → Chicago (MDW) | 19 |
| 285 | Chicago (MDW) → Fort Myers (RSW) | 19 |
| 286 | Tulsa (TUL) → Phoenix (PHX) | 19 |
| 287 | Sarasota/Bradenton (SRQ) → Columbus (CMH) | 19 |
| 288 | Eugene (EUG) → Oakland (OAK) | 18 |
| 289 | Nashville (BNA) → Fort Lauderdale (FLL) | 18 |
| 290 | Orlando (MCO) → Providence (PVD) | 18 |
| 291 | Chicago (MDW) → Raleigh/Durham (RDU) | 18 |
| 292 | Baltimore (BWI) → Chicago (MDW) | 18 |
| 293 | Chicago (MDW) → Miami (MIA) | 18 |
| 294 | Memphis (MEM) → Dallas (DAL) | 18 |
| 295 | Santa Ana (SNA) → Sacramento (SMF) | 18 |
| 296 | Phoenix (PHX) → Burbank (BUR) | 18 |
| 297 | San Diego (SAN) → Baltimore (BWI) | 18 |
| 298 | Houston (HOU) → Denver (DEN) | 18 |
| 299 | Orlando (MCO) → Hartford (BDL) | 18 |
| 300 | Dallas (DAL) → San Jose (SJC) | 18 |
Top 10 Southwest Airlines flights we tracked
| # | Flight | Route | Times seen |
|---|---|---|---|
| 1 | SWA4303 | Sacramento (SMF) → Nashville (BNA) | 22 |
| 2 | SWA1771 | Seattle (SEA) → San Jose (SJC) | 21 |
| 3 | SWA1683 | Ontario (ONT) → Las Vegas (LAS) | 20 |
| 4 | SWA2222 | Las Vegas (LAS) → Oakland (OAK) | 20 |
| 5 | SWA300 | Hartford (BDL) → Chicago (MDW) | 20 |
| 6 | SWA3585 | — | 19 |
| 7 | SWA375 | Denver (DEN) → Oakland (OAK) | 19 |
| 8 | SWA107 | San Jose (SJC) → San Diego (SAN) | 18 |
| 9 | SWA1555 | Seattle (SEA) → Oakland (OAK) | 18 |
| 10 | SWA1604 | Palm Springs (PSP) → Oakland (OAK) | 18 |
Frequently asked questions about Southwest Airlines
Where is my Southwest Airlines flight right now?
Search the flight number (WN plus digits) in the search box on this page. If the aircraft is airborne within receiver coverage, you will see its live status; before departure you will see the route.
Is my Southwest Airlines flight delayed or cancelled?
Check the flight number on this page for live status, but for rebooking, gate changes and cancellations the airline itself remains the authoritative source.
What do WN and SWA mean on Southwest Airlines flights?
They are two prefixes for the same airline. WN is the IATA code you see on tickets; SWA is the ICAO code used in flight plans and by air traffic control.
Does Southwest Airlines operate flights for other airlines?
Codeshare agreements mean a flight sold under another carrier's number may be operated by Southwest Airlines, and the reverse. Live tracking always follows the operating carrier's flight number; check the "operated by" line on your booking.