diff --git a/NEWS.md b/NEWS.md
index 1425e1ea..aa1ccf4d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -15,8 +15,12 @@ where the formatting is also better._
 
 ### Bug fixes
 
-- Fixed bug where single-valued discrete axes would trigger invalid `par(usr)`
-  values when combined with free facets. (#668 @grantmcdermott)
+- Fixed several bugs specific to plots with free facets (i.e.,
+  `facet.args = list(free = TRUE)`):
+  - Single-valued discrete axes no longer trigger invalid `par(usr)` values.
+    (#668 @grantmcdermott)
+  - User-provided `x/ylim` overrides now work correctly with flipped plots.
+    (#670 @grantmcdermott)
 
 ## v0.7.0
 
diff --git a/R/flip.R b/R/flip.R
index 66980264..c753fe0d 100644
--- a/R/flip.R
+++ b/R/flip.R
@@ -30,6 +30,7 @@ flip_datapoints = function(settings) {
       swap_elements(settings, "xlab", "ylab")
       swap_elements(settings, "xlabs", "ylabs")
       swap_elements(settings, "xlim", "ylim")
+      swap_elements(settings, "null_xlim", "null_ylim")
       swap_elements(settings, "rev_x", "rev_y")
       swap_elements(settings, "xmax", "ymax")
       swap_elements(settings, "xmin", "ymin")
diff --git a/inst/tinytest/_tinysnapshot/facet_free_flip.svg b/inst/tinytest/_tinysnapshot/facet_free_flip.svg
new file mode 100644
index 00000000..a250535f
--- /dev/null
+++ b/inst/tinytest/_tinysnapshot/facet_free_flip.svg
@@ -0,0 +1,159 @@
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diff --git a/inst/tinytest/test-facet.R b/inst/tinytest/test-facet.R
index 0c139a7c..41f256f5 100644
--- a/inst/tinytest/test-facet.R
+++ b/inst/tinytest/test-facet.R
@@ -572,6 +572,19 @@ f = function() {
 }
 expect_snapshot_plot(f, label = "facet_free_single_value")
 
+# Free facets combined with flip: the fixed continuous-axis limit must follow
+# the flip and be honoured, rather than the wrong axis being freed (issue #670)
+f = function() {
+  tinyplot(
+    mpg ~ carb, data = mtcars, type = "p",
+    facet = ~am, facet.args = list(free = TRUE),
+    ylim = c(0, 50),
+    flip = TRUE,
+    main = "Free facets: flipped"
+  )
+}
+expect_snapshot_plot(f, label = "facet_free_flip")
+
 #
 # restore original par settings
 #