Todas las líneas aéreas volando desde Ronald Reagan Washington (DCA) a Oakland (OAK).

HORARIO DE VUELOS
Vuelos no directos:
Lun,Jue,Vie 11:45 Ronald Reagan Washington (DCA) 15:35 Oakland (OAK) 2 Southwest Airlines WN 286 1-stop Boeing 737-700 (73W) 6:50 Valid until 2024-09-30
Lun,Jue,Vie 17:05 Ronald Reagan Washington (DCA) 21:55 Oakland (OAK) 2 Southwest Airlines WN 634 1-stop Boeing 737-800 (73H) 7:50 Effective 2024-10-03 through 2024-10-28
Vie 17:05 Ronald Reagan Washington (DCA) 21:55 Oakland (OAK) 2 Southwest Airlines WN 634 1-stop Boeing 737-800 (73H) 7:50 Operates only on 2024-11-01
Jue,Vie,Dom 12:55 Ronald Reagan Washington (DCA) 17:30 Oakland (OAK) 2 Southwest Airlines WN 1352 1-stop Boeing 737-700 (73W) 7:35 Effective 2025-01-12 through 2025-01-17
Lun,Dom 12:55 Ronald Reagan Washington (DCA) 17:30 Oakland (OAK) 2 Southwest Airlines WN 1352 1-stop Boeing 737-700 (73W) 7:35 Effective 2025-01-20 through 2025-01-26
Jue,Vie,Dom 12:55 Ronald Reagan Washington (DCA) 17:30 Oakland (OAK) 2 Southwest Airlines WN 1352 1-stop Boeing 737-700 (73W) 7:35 Effective 2025-02-02 through 2025-02-07
Lun 12:55 Ronald Reagan Washington (DCA) 17:30 Oakland (OAK) 2 Southwest Airlines WN 1352 1-stop Boeing 737-700 (73W) 7:35 Operates only on 2025-02-10
Lun,Mar,Jue 12:55 Ronald Reagan Washington (DCA) 17:30 Oakland (OAK) 2 Southwest Airlines WN 1352 1-stop Boeing 737-700 (73W) 7:35 Effective 2025-02-18 through 2025-02-24
Lun 12:55 Ronald Reagan Washington (DCA) 17:30 Oakland (OAK) 2 Southwest Airlines WN 1352 1-stop Boeing 737-700 (73W) 7:35 Operates only on 2025-03-03
Lun,Jue,Vie 11:45 Ronald Reagan Washington (DCA) 15:45 Oakland (OAK) 2 Southwest Airlines WN 2424 1-stop Boeing 737-700 (73W) 7:00 Effective 2024-10-03 through 2024-10-28
Vie 11:45 Ronald Reagan Washington (DCA) 15:45 Oakland (OAK) 2 Southwest Airlines WN 2424 1-stop Boeing 737-700 (73W) 7:00 Operates only on 2024-11-01
Mar,Mie 11:55 Ronald Reagan Washington (DCA) 16:00 Oakland (OAK) 2 Southwest Airlines WN 2424 1-stop Boeing 737-700 (73W) 7:05 Effective 2024-10-08 through 2024-10-30
Jue,Vie,Dom 15:50 Ronald Reagan Washington (DCA) 20:20 Oakland (OAK) 2 Southwest Airlines WN 2895 1-stop Boeing 737-700 (73W) 7:30 Effective 2024-11-03 through 2024-11-10
Lun,Jue,Vie,Dom 15:50 Ronald Reagan Washington (DCA) 20:20 Oakland (OAK) 2 Southwest Airlines WN 2895 1-stop Boeing 737-700 (73W) 7:30 Effective 2024-11-11 through 2024-11-25
Vie,Dom 15:50 Ronald Reagan Washington (DCA) 20:20 Oakland (OAK) 2 Southwest Airlines WN 2895 1-stop Boeing 737-700 (73W) 7:30 Effective 2024-12-08 through 2024-12-15
Jue 15:50 Ronald Reagan Washington (DCA) 20:20 Oakland (OAK) 2 Southwest Airlines WN 2895 1-stop Boeing 737-700 (73W) 7:30 Operates only on 2024-12-19
Vie 15:50 Ronald Reagan Washington (DCA) 20:20 Oakland (OAK) 2 Southwest Airlines WN 2895 1-stop Boeing 737-700 (73W) 7:30 Operates only on 2025-01-03
Lun-Mie 09:30 Ronald Reagan Washington (DCA) 14:05 Oakland (OAK) 2 Southwest Airlines WN 3047 1-stop Boeing 737-700 (73W) 7:35 Effective 2024-11-26 through 2024-12-02
Lun,Jue,Vie,Dom 09:30 Ronald Reagan Washington (DCA) 14:05 Oakland (OAK) 2 Southwest Airlines WN 3047 1-stop Boeing 737-700 (73W) 7:35 Effective 2024-12-20 through 2025-01-02
Dom 09:30 Ronald Reagan Washington (DCA) 14:05 Oakland (OAK) 2 Southwest Airlines WN 3047 1-stop Boeing 737-700 (73W) 7:35 Operates only on 2025-01-05
Mar,Mie 11:50 Ronald Reagan Washington (DCA) 15:35 Oakland (OAK) 2 Southwest Airlines WN 4185 1-stop Boeing 737-700 (73W) 6:45 Valid until 2024-10-02
Lun,Jue,Vie,Dom 12:45 Ronald Reagan Washington (DCA) 17:20 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:35 Effective 2025-02-13 through 2025-02-17
Jue,Vie,Dom 12:45 Ronald Reagan Washington (DCA) 17:20 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:35 Effective 2025-02-21 through 2025-03-02
Lun-Mie 12:50 Ronald Reagan Washington (DCA) 17:25 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737 MAX 8 (7M8) 7:35 Effective 2024-11-04 through 2024-11-06
Mar,Mie 12:50 Ronald Reagan Washington (DCA) 17:25 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737 MAX 8 (7M8) 7:35 Effective 2024-11-12 through 2024-11-20
Mar-Vie 12:50 Ronald Reagan Washington (DCA) 17:25 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737 MAX 8 (7M8) 7:35 Effective 2024-11-29 through 2024-12-06
Lun-Jue 12:50 Ronald Reagan Washington (DCA) 17:25 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737 MAX 8 (7M8) 7:35 Effective 2024-12-09 through 2024-12-18
Mar,Mie 12:50 Ronald Reagan Washington (DCA) 17:25 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737 MAX 8 (7M8) 7:35 Effective 2024-12-24 through 2025-01-01
Lun 12:50 Ronald Reagan Washington (DCA) 17:25 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737 MAX 8 (7M8) 7:35 Operates only on 2025-01-06
Lun-Vie 12:55 Ronald Reagan Washington (DCA) 17:35 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:40 Effective 2025-01-07 through 2025-01-15
Mar-Vie,Dom 12:55 Ronald Reagan Washington (DCA) 17:35 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:40 Effective 2025-01-19 through 2025-01-24
Lun-Vie 12:55 Ronald Reagan Washington (DCA) 17:35 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:40 Effective 2025-01-27 through 2025-02-05
Mar,Mie,Dom 12:55 Ronald Reagan Washington (DCA) 17:35 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:40 Effective 2025-02-09 through 2025-02-12
Mar,Mie 12:55 Ronald Reagan Washington (DCA) 17:35 Oakland (OAK) 2 Southwest Airlines WN 4805 1-stop Boeing 737-700 (73W) 7:40 Effective 2025-02-19 through 2025-03-05
Sab 11:50 Ronald Reagan Washington (DCA) 17:45 Oakland (OAK) 2 Southwest Airlines WN 1669 2-stop Boeing 737-700 (73W) 8:55 Effective 2024-10-05 through 2024-11-02
Lun-Mie 11:40 Ronald Reagan Washington (DCA) 19:10 Oakland (OAK) 2 Southwest Airlines WN 594 3-stop Boeing 737-700 (73W) 10:30 Effective 2024-11-26 through 2024-12-02
Lun,Jue,Vie,Dom 11:40 Ronald Reagan Washington (DCA) 19:10 Oakland (OAK) 2 Southwest Airlines WN 594 3-stop Boeing 737-700 (73W) 10:30 Effective 2024-12-20 through 2025-01-02
Dom 11:40 Ronald Reagan Washington (DCA) 19:10 Oakland (OAK) 2 Southwest Airlines WN 594 3-stop Boeing 737-700 (73W) 10:30 Operates only on 2025-01-05
Lun,Jue,Vie,Dom 11:55 Ronald Reagan Washington (DCA) 20:05 Oakland (OAK) 2 Southwest Airlines WN 3425 3-stop Boeing 737-700 (73W) 11:10 Effective 2025-02-13 through 2025-02-17
Jue,Vie,Dom 11:55 Ronald Reagan Washington (DCA) 20:05 Oakland (OAK) 2 Southwest Airlines WN 3425 3-stop Boeing 737-700 (73W) 11:10 Effective 2025-02-21 through 2025-03-02
Jue 11:30 Ronald Reagan Washington (DCA) 19:20 Oakland (OAK) 2 Southwest Airlines WN 4775 3-stop Boeing 737-700 (73W) 10:50 Operates only on 2024-10-31

Una ruta nacional saliendo desde el aeropuerto Ronald Reagan Washington (DCA) y llegando al aeropuerto Oakland (OAK).
El vuelo tiene una distancia de 2425 millas, o 3902 km.
La zona horaria del aeropuerto de salida es UTC-5 , y la zona horario del aeropuerto de llegada es UTC-8 . La hora actual en el punto de salida es (loading...), y (loading...) en el punto de llegada. Hay una diferencia de tiempo de (loading...) hora/s entre los aeropuertos.

Vuelos de regreso (OAK-DCA)

Comentarios - Descargo de responsabilidad - Privacidad

Todas las líneas aéreas volando desde Ronald Reagan Washington (DCA) a Oakland (OAK).

HORARIO DE VUELOS

Vuelos no directos:

Southwest Airlines WN286

11:45

Ronald Reagan Washington (DCA)

15:35

Oakland (OAK) 2

Valid until 2024-09-30

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom
-

Duration: 6:50, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN634

17:05

Ronald Reagan Washington (DCA)

21:55

Oakland (OAK) 2

Effective 2024-10-03 through 2024-10-28

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom
-

Duration: 7:50, 1-stop
Boeing 737-800 (73H)

Southwest Airlines WN634

17:05

Ronald Reagan Washington (DCA)

21:55

Oakland (OAK) 2

Operates only on 2024-11-01

Lun
-

Mar
-

Mie
-

Jue
-

Vie

Sab
-

Dom
-

Duration: 7:50, 1-stop
Boeing 737-800 (73H)

Southwest Airlines WN1352

12:55

Ronald Reagan Washington (DCA)

17:30

Oakland (OAK) 2

Effective 2025-01-12 through 2025-01-17

Lun
-

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN1352

12:55

Ronald Reagan Washington (DCA)

17:30

Oakland (OAK) 2

Effective 2025-01-20 through 2025-01-26

Lun

Mar
-

Mie
-

Jue
-

Vie
-

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN1352

12:55

Ronald Reagan Washington (DCA)

17:30

Oakland (OAK) 2

Effective 2025-02-02 through 2025-02-07

Lun
-

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN1352

12:55

Ronald Reagan Washington (DCA)

17:30

Oakland (OAK) 2

Operates only on 2025-02-10

Lun

Mar
-

Mie
-

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN1352

12:55

Ronald Reagan Washington (DCA)

17:30

Oakland (OAK) 2

Effective 2025-02-18 through 2025-02-24

Lun

Mar

Mie
-

Jue

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN1352

12:55

Ronald Reagan Washington (DCA)

17:30

Oakland (OAK) 2

Operates only on 2025-03-03

Lun

Mar
-

Mie
-

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2424

11:45

Ronald Reagan Washington (DCA)

15:45

Oakland (OAK) 2

Effective 2024-10-03 through 2024-10-28

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom
-

Duration: 7:00, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2424

11:45

Ronald Reagan Washington (DCA)

15:45

Oakland (OAK) 2

Operates only on 2024-11-01

Lun
-

Mar
-

Mie
-

Jue
-

Vie

Sab
-

Dom
-

Duration: 7:00, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2424

11:55

Ronald Reagan Washington (DCA)

16:00

Oakland (OAK) 2

Effective 2024-10-08 through 2024-10-30

Lun
-

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:05, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2895

15:50

Ronald Reagan Washington (DCA)

20:20

Oakland (OAK) 2

Effective 2024-11-03 through 2024-11-10

Lun
-

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:30, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2895

15:50

Ronald Reagan Washington (DCA)

20:20

Oakland (OAK) 2

Effective 2024-11-11 through 2024-11-25

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:30, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2895

15:50

Ronald Reagan Washington (DCA)

20:20

Oakland (OAK) 2

Effective 2024-12-08 through 2024-12-15

Lun
-

Mar
-

Mie
-

Jue
-

Vie

Sab
-

Dom

Duration: 7:30, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2895

15:50

Ronald Reagan Washington (DCA)

20:20

Oakland (OAK) 2

Operates only on 2024-12-19

Lun
-

Mar
-

Mie
-

Jue

Vie
-

Sab
-

Dom
-

Duration: 7:30, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN2895

15:50

Ronald Reagan Washington (DCA)

20:20

Oakland (OAK) 2

Operates only on 2025-01-03

Lun
-

Mar
-

Mie
-

Jue
-

Vie

Sab
-

Dom
-

Duration: 7:30, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN3047

09:30

Ronald Reagan Washington (DCA)

14:05

Oakland (OAK) 2

Effective 2024-11-26 through 2024-12-02

Lun

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN3047

09:30

Ronald Reagan Washington (DCA)

14:05

Oakland (OAK) 2

Effective 2024-12-20 through 2025-01-02

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN3047

09:30

Ronald Reagan Washington (DCA)

14:05

Oakland (OAK) 2

Operates only on 2025-01-05

Lun
-

Mar
-

Mie
-

Jue
-

Vie
-

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4185

11:50

Ronald Reagan Washington (DCA)

15:35

Oakland (OAK) 2

Valid until 2024-10-02

Lun
-

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 6:45, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:45

Ronald Reagan Washington (DCA)

17:20

Oakland (OAK) 2

Effective 2025-02-13 through 2025-02-17

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:45

Ronald Reagan Washington (DCA)

17:20

Oakland (OAK) 2

Effective 2025-02-21 through 2025-03-02

Lun
-

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 7:35, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:50

Ronald Reagan Washington (DCA)

17:25

Oakland (OAK) 2

Effective 2024-11-04 through 2024-11-06

Lun

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN4805

12:50

Ronald Reagan Washington (DCA)

17:25

Oakland (OAK) 2

Effective 2024-11-12 through 2024-11-20

Lun
-

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN4805

12:50

Ronald Reagan Washington (DCA)

17:25

Oakland (OAK) 2

Effective 2024-11-29 through 2024-12-06

Lun
-

Mar

Mie

Jue

Vie

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN4805

12:50

Ronald Reagan Washington (DCA)

17:25

Oakland (OAK) 2

Effective 2024-12-09 through 2024-12-18

Lun

Mar

Mie

Jue

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN4805

12:50

Ronald Reagan Washington (DCA)

17:25

Oakland (OAK) 2

Effective 2024-12-24 through 2025-01-01

Lun
-

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN4805

12:50

Ronald Reagan Washington (DCA)

17:25

Oakland (OAK) 2

Operates only on 2025-01-06

Lun

Mar
-

Mie
-

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:35, 1-stop
Boeing 737 MAX 8 (7M8)

Southwest Airlines WN4805

12:55

Ronald Reagan Washington (DCA)

17:35

Oakland (OAK) 2

Effective 2025-01-07 through 2025-01-15

Lun

Mar

Mie

Jue

Vie

Sab
-

Dom
-

Duration: 7:40, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:55

Ronald Reagan Washington (DCA)

17:35

Oakland (OAK) 2

Effective 2025-01-19 through 2025-01-24

Lun
-

Mar

Mie

Jue

Vie

Sab
-

Dom

Duration: 7:40, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:55

Ronald Reagan Washington (DCA)

17:35

Oakland (OAK) 2

Effective 2025-01-27 through 2025-02-05

Lun

Mar

Mie

Jue

Vie

Sab
-

Dom
-

Duration: 7:40, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:55

Ronald Reagan Washington (DCA)

17:35

Oakland (OAK) 2

Effective 2025-02-09 through 2025-02-12

Lun
-

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom

Duration: 7:40, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN4805

12:55

Ronald Reagan Washington (DCA)

17:35

Oakland (OAK) 2

Effective 2025-02-19 through 2025-03-05

Lun
-

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 7:40, 1-stop
Boeing 737-700 (73W)

Southwest Airlines WN1669

11:50

Ronald Reagan Washington (DCA)

17:45

Oakland (OAK) 2

Effective 2024-10-05 through 2024-11-02

Lun
-

Mar
-

Mie
-

Jue
-

Vie
-

Sab

Dom
-

Duration: 8:55, 2-stop
Boeing 737-700 (73W)

Southwest Airlines WN594

11:40

Ronald Reagan Washington (DCA)

19:10

Oakland (OAK) 2

Effective 2024-11-26 through 2024-12-02

Lun

Mar

Mie

Jue
-

Vie
-

Sab
-

Dom
-

Duration: 10:30, 3-stop
Boeing 737-700 (73W)

Southwest Airlines WN594

11:40

Ronald Reagan Washington (DCA)

19:10

Oakland (OAK) 2

Effective 2024-12-20 through 2025-01-02

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 10:30, 3-stop
Boeing 737-700 (73W)

Southwest Airlines WN594

11:40

Ronald Reagan Washington (DCA)

19:10

Oakland (OAK) 2

Operates only on 2025-01-05

Lun
-

Mar
-

Mie
-

Jue
-

Vie
-

Sab
-

Dom

Duration: 10:30, 3-stop
Boeing 737-700 (73W)

Southwest Airlines WN3425

11:55

Ronald Reagan Washington (DCA)

20:05

Oakland (OAK) 2

Effective 2025-02-13 through 2025-02-17

Lun

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 11:10, 3-stop
Boeing 737-700 (73W)

Southwest Airlines WN3425

11:55

Ronald Reagan Washington (DCA)

20:05

Oakland (OAK) 2

Effective 2025-02-21 through 2025-03-02

Lun
-

Mar
-

Mie
-

Jue

Vie

Sab
-

Dom

Duration: 11:10, 3-stop
Boeing 737-700 (73W)

Southwest Airlines WN4775

11:30

Ronald Reagan Washington (DCA)

19:20

Oakland (OAK) 2

Operates only on 2024-10-31

Lun
-

Mar
-

Mie
-

Jue

Vie
-

Sab
-

Dom
-

Duration: 10:50, 3-stop
Boeing 737-700 (73W)

Una ruta nacional saliendo desde el aeropuerto Ronald Reagan Washington (DCA) y llegando al aeropuerto Oakland (OAK).
El vuelo tiene una distancia de 2425 millas, o 3902 km.
La zona horaria del aeropuerto de salida es UTC-5 , y la zona horario del aeropuerto de llegada es UTC-8 . La hora actual en el punto de salida es (loading...), y (loading...) en el punto de llegada. Hay una diferencia de tiempo de (loading...) hora/s entre los aeropuertos.

Vuelos de regreso (OAK-DCA)

Comentarios - Descargo de responsabilidad - Privacidad