It is really hit and miss.  I normally try around 10:30 am to noon and often have success.  Then another day the line will be real long.  Yesterday I expected a long line in the afternoon with the start of a 3 day weekend, but the line was not bad at all.  I crossed at 9pm and the line started in the building.

Here are some numbers that are updated every hour with line info, both car and pedestrian.

San Ysidro: 619-690-8999
Otay: 619-671-8999

Sundays and holidays have the longest lines.  Saturdays are next.

For pedestrians--except on Sundays--any time after about 8pm is usually good.  Mid-morning to mid-afternoon is better than the morning and evening commute times.

For motorists later is better. (Until workers hours begin, which is often as early as 2am).  I usually try to cross between 11:30pm and 1:30am.

Strangely Friday nights about 11pm (sometimes as early as 10pm) is a good time to cross.  For some reason I can't identify Friday nights are usually better than other weekday nights.  Also early Sunday morning (say 6am) is a good time to cross.

Usually it is quicker to cross at Otay than at San Ysidro.

Nothing beats a SENTRI pass.  SENTRI lines are always short to none existent.

-- Modified on 5/30/2011 12:10:36 AM

Get a SENTRI pass. You walk straight to the head of the pedestrian line.  It literally takes a minute or two to cross the border.  It is better than a BJ.

P.S.  I have not posted here in over a year or so.  I don't know why.  I guess I just forgot about this forum.  

-- Modified on 6/5/2011 11:06:09 AM