In A New Hope, after Han and Luke fight off the TIE Fighters while escaping from the Death Star, these exchanges happen:
INT. DEATH STAR - CONTROL ROOM
Darth Vader strides into the control room, where Tarkin is
watching the huge view screen. A sea of stars is before him.
TARKIN
Are they away?
VADER
They have just made the jump into
hyperspace.
TARKIN
You're sure the homing beacon is
secure aboard their ship? I'm taking
an awful risk, Vader. This had better
work.
INT. MILLENNIUM FALCON - COCKPIT
Han, removes his gloves and smiling, is at the controls of
the ship. Chewie moves into the aft section to check the
damage. Leia is seated near Han.
HAN
Not a bad bit of rescuing, huh? You
know, sometimes I even amaze myself.
LEIA
That doesn't sound too hard. Besides,
they let us go. It's the only
explanation for the ease of our
escape.
HAN
Easy... you call that easy?
LEIA
They're tracking us!
HAN
Not this ship, sister.
Frustrated, Leia shakes her head.
LEIA
At least the information in Artoo is
still intact.
HAN
What's so important? What's he
carrying?
LEIA
The technical readouts of that battle
station. I only hope that when the
data is analyzed, a weakness can be
found. It's not over yet!
Leia doesn't even know if there is a weakness, let alone whether they'll find one. If she (correctly) realizes that they're being tracked, why doesn't she suggest that the Millennium Falcon go somewhere besides Yavin 4 instead of just frustratedly shaking her head? I know the plans apparently have to be delivered in person, but it seems unlikely that continuing to fly to the secret Rebel base in the ship she's certain is being tracked is the only option. They are already in hyperspace when this conversation happens, but they apparently have time to talk for a little while after, so presumably they'd have time to stop and reroute.