diff --git a/packages/flutter_tools/lib/src/commands/devices.dart b/packages/flutter_tools/lib/src/commands/devices.dart
index 07ed49fc4d..c2b52085b6 100644
--- a/packages/flutter_tools/lib/src/commands/devices.dart
+++ b/packages/flutter_tools/lib/src/commands/devices.dart
@@ -27,7 +27,7 @@ class DevicesCommand extends FlutterCommand {
         exitCode: 1);
     }
 
-    final List<Device> devices = await deviceManager.getAllConnectedDevices().toList();
+    final List<Device> devices = await deviceManager.getAllConnectedDevices();
 
     if (devices.isEmpty) {
       globals.printStatus(
diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index b3dd7d189b..0a28259143 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -100,8 +100,8 @@ class DeviceManager {
   /// specifiedDeviceId = 'all'.
   bool get hasSpecifiedAllDevices => _specifiedDeviceId == 'all';
 
-  Stream<Device> getDevicesById(String deviceId) async* {
-    final List<Device> devices = await getAllConnectedDevices().toList();
+  Future<List<Device>> getDevicesById(String deviceId) async {
+    final List<Device> devices = await getAllConnectedDevices();
     deviceId = deviceId.toLowerCase();
     bool exactlyMatchesDeviceId(Device device) =>
         device.id.toLowerCase() == deviceId ||
@@ -113,18 +113,15 @@ class DeviceManager {
     final Device exactMatch = devices.firstWhere(
         exactlyMatchesDeviceId, orElse: () => null);
     if (exactMatch != null) {
-      yield exactMatch;
-      return;
+      return <Device>[exactMatch];
     }
 
     // Match on a id or name starting with [deviceId].
-    for (final Device device in devices.where(startsWithDeviceId)) {
-      yield device;
-    }
+    return devices.where(startsWithDeviceId).toList();
   }
 
   /// Return the list of connected devices, filtered by any user-specified device id.
-  Stream<Device> getDevices() {
+  Future<List<Device>> getDevices() {
     return hasSpecifiedDeviceId
         ? getDevicesById(specifiedDeviceId)
         : getAllConnectedDevices();
@@ -135,12 +132,13 @@ class DeviceManager {
   }
 
   /// Return the list of all connected devices.
-  Stream<Device> getAllConnectedDevices() async* {
-    for (final DeviceDiscovery discoverer in _platformDiscoverers) {
-      for (final Device device in await discoverer.devices) {
-        yield device;
-      }
-    }
+  Future<List<Device>> getAllConnectedDevices() async {
+    final List<List<Device>> devices = await Future.wait<List<Device>>(<Future<List<Device>>>[
+      for (final DeviceDiscovery discoverer in _platformDiscoverers)
+        discoverer.devices,
+    ]);
+
+    return devices.expand<Device>((List<Device> deviceList) => deviceList).toList();
   }
 
   /// Whether we're capable of listing any devices given the current environment configuration.
@@ -170,7 +168,7 @@ class DeviceManager {
   /// device connected, then filter out unsupported devices and prioritize
   /// ephemeral devices.
   Future<List<Device>> findTargetDevices(FlutterProject flutterProject) async {
-    List<Device> devices = await getDevices().toList();
+    List<Device> devices = await getDevices();
 
     // Always remove web and fuchsia devices from `--all`. This setting
     // currently requires devices to share a frontend_server and resident
diff --git a/packages/flutter_tools/lib/src/doctor.dart b/packages/flutter_tools/lib/src/doctor.dart
index d2a39a7c1b..9078488ae0 100644
--- a/packages/flutter_tools/lib/src/doctor.dart
+++ b/packages/flutter_tools/lib/src/doctor.dart
@@ -878,7 +878,7 @@ class DeviceValidator extends DoctorValidator {
 
   @override
   Future<ValidationResult> validate() async {
-    final List<Device> devices = await deviceManager.getAllConnectedDevices().toList();
+    final List<Device> devices = await deviceManager.getAllConnectedDevices();
     List<ValidationMessage> messages;
     if (devices.isEmpty) {
       final List<String> diagnostics = await deviceManager.getDeviceDiagnostics();
diff --git a/packages/flutter_tools/lib/src/runner/flutter_command.dart b/packages/flutter_tools/lib/src/runner/flutter_command.dart
index a17cb74fca..25d752a2da 100644
--- a/packages/flutter_tools/lib/src/runner/flutter_command.dart
+++ b/packages/flutter_tools/lib/src/runner/flutter_command.dart
@@ -718,7 +718,7 @@ abstract class FlutterCommand extends Command<void> {
        globals.printStatus(userMessages.flutterFoundSpecifiedDevices(devices.length, deviceManager.specifiedDeviceId));
       } else {
         globals.printStatus(userMessages.flutterSpecifyDeviceWithAllOption);
-        devices = await deviceManager.getAllConnectedDevices().toList();
+        devices = await deviceManager.getAllConnectedDevices();
       }
       globals.printStatus('');
       await Device.printDevices(devices);
@@ -738,7 +738,7 @@ abstract class FlutterCommand extends Command<void> {
     }
     if (deviceList.length > 1) {
       globals.printStatus(userMessages.flutterSpecifyDevice);
-      deviceList = await deviceManager.getAllConnectedDevices().toList();
+      deviceList = await deviceManager.getAllConnectedDevices();
       globals.printStatus('');
       await Device.printDevices(deviceList);
       return null;
@@ -804,7 +804,7 @@ mixin DeviceBasedDevelopmentArtifacts on FlutterCommand {
     // If there are no attached devices, use the default configuration.
     // Otherwise, only add development artifacts which correspond to a
     // connected device.
-    final List<Device> devices = await deviceManager.getDevices().toList();
+    final List<Device> devices = await deviceManager.getDevices();
     if (devices.isEmpty) {
       return super.requiredArtifacts;
     }
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/run_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/run_test.dart
index c0e4414427..77f60ad9f4 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/run_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/run_test.dart
@@ -95,7 +95,7 @@ void main() {
         return Future<List<Device>>.value(<Device>[mockDevice]);
       });
       when(deviceManager.getDevices()).thenAnswer((Invocation invocation) {
-        return Stream<Device>.value(mockDevice);
+        return Future<List<Device>>.value(<Device>[mockDevice]);
       });
       globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
       globals.fs.file('pubspec.yaml').createSync();
@@ -215,7 +215,7 @@ void main() {
 
         const List<Device> noDevices = <Device>[];
         when(mockDeviceManager.getDevices()).thenAnswer(
-          (Invocation invocation) => Stream<Device>.fromIterable(noDevices)
+          (Invocation invocation) => Future<List<Device>>.value(noDevices)
         );
         when(mockDeviceManager.findTargetDevices(any)).thenAnswer(
           (Invocation invocation) => Future<List<Device>>.value(noDevices)
@@ -245,7 +245,7 @@ void main() {
 
         // Called as part of requiredArtifacts()
         when(mockDeviceManager.getDevices()).thenAnswer(
-          (Invocation invocation) => Stream<Device>.fromIterable(<Device>[])
+          (Invocation invocation) => Future<List<Device>>.value(<Device>[])
         );
         // No devices are attached, we just want to verify update the cache
         // BEFORE checking for devices
@@ -308,7 +308,7 @@ void main() {
         )).thenReturn('/path/to/sdk');
 
         when(mockDeviceManager.getDevices()).thenAnswer(
-          (Invocation invocation) => Stream<Device>.fromIterable(<Device>[mockDevice]),
+          (Invocation invocation) => Future<List<Device>>.value(<Device>[mockDevice])
         );
 
         when(mockDeviceManager.findTargetDevices(any)).thenAnswer(
@@ -366,9 +366,7 @@ void main() {
       setUpAll(() {
         final FakeDevice fakeDevice = FakeDevice();
         when(mockDeviceManager.getDevices()).thenAnswer((Invocation invocation) {
-          return Stream<Device>.fromIterable(<Device>[
-            fakeDevice,
-          ]);
+          return Future<List<Device>>.value(<Device>[fakeDevice]);
         });
         when(mockDeviceManager.findTargetDevices(any)).thenAnswer(
           (Invocation invocation) => Future<List<Device>>.value(<Device>[fakeDevice])
@@ -454,7 +452,7 @@ void main() {
 
     testUsingContext('should only request artifacts corresponding to connected devices', () async {
       when(mockDeviceManager.getDevices()).thenAnswer((Invocation invocation) {
-        return Stream<Device>.fromIterable(<Device>[
+        return Future<List<Device>>.value(<Device>[
           MockDevice(TargetPlatform.android_arm),
         ]);
       });
@@ -465,7 +463,7 @@ void main() {
       }));
 
       when(mockDeviceManager.getDevices()).thenAnswer((Invocation invocation) {
-        return Stream<Device>.fromIterable(<Device>[
+        return Future<List<Device>>.value(<Device>[
           MockDevice(TargetPlatform.ios),
         ]);
       });
@@ -476,7 +474,7 @@ void main() {
       }));
 
       when(mockDeviceManager.getDevices()).thenAnswer((Invocation invocation) {
-        return Stream<Device>.fromIterable(<Device>[
+        return Future<List<Device>>.value(<Device>[
           MockDevice(TargetPlatform.ios),
           MockDevice(TargetPlatform.android_arm),
         ]);
@@ -489,7 +487,7 @@ void main() {
       }));
 
       when(mockDeviceManager.getDevices()).thenAnswer((Invocation invocation) {
-        return Stream<Device>.fromIterable(<Device>[
+        return Future<List<Device>>.value(<Device>[
           MockDevice(TargetPlatform.web_javascript),
         ]);
       });
@@ -510,7 +508,7 @@ void main() {
       setUpAll(() {
         final FakeDevice fakeDevice = FakeDevice().._targetPlatform = TargetPlatform.web_javascript;
         when(mockDeviceManager.getDevices()).thenAnswer(
-          (Invocation invocation) => Stream<Device>.fromIterable(<Device>[fakeDevice])
+          (Invocation invocation) => Future<List<Device>>.value(<Device>[fakeDevice])
         );
         when(mockDeviceManager.findTargetDevices(any)).thenAnswer(
           (Invocation invocation) => Future<List<Device>>.value(<Device>[fakeDevice])
@@ -612,7 +610,7 @@ class TestRunCommand extends RunCommand {
   @override
   // ignore: must_call_super
   Future<void> validateCommand() async {
-    devices = await deviceManager.getDevices().toList();
+    devices = await deviceManager.getDevices();
   }
 }
 
diff --git a/packages/flutter_tools/test/general.shard/device_test.dart b/packages/flutter_tools/test/general.shard/device_test.dart
index 601b9e5e70..ebbf48848c 100644
--- a/packages/flutter_tools/test/general.shard/device_test.dart
+++ b/packages/flutter_tools/test/general.shard/device_test.dart
@@ -18,7 +18,7 @@ void main() {
     testUsingContext('getDevices', () async {
       // Test that DeviceManager.getDevices() doesn't throw.
       final DeviceManager deviceManager = DeviceManager();
-      final List<Device> devices = await deviceManager.getDevices().toList();
+      final List<Device> devices = await deviceManager.getDevices();
       expect(devices, isList);
     });
 
@@ -30,7 +30,7 @@ void main() {
       final DeviceManager deviceManager = TestDeviceManager(devices);
 
       Future<void> expectDevice(String id, List<Device> expected) async {
-        expect(await deviceManager.getDevicesById(id).toList(), expected);
+        expect(await deviceManager.getDevicesById(id), expected);
       }
       await expectDevice('01abfc49119c410e', <Device>[device2]);
       await expectDevice('Nexus 5X', <Device>[device2]);
@@ -170,9 +170,7 @@ class TestDeviceManager extends DeviceManager {
   bool isAlwaysSupportedOverride;
 
   @override
-  Stream<Device> getAllConnectedDevices() {
-    return Stream<Device>.fromIterable(allDevices);
-  }
+  Future<List<Device>> getAllConnectedDevices() async => allDevices;
 
   @override
   bool isDeviceSupportedForProject(Device device, FlutterProject flutterProject) {
diff --git a/packages/flutter_tools/test/src/context.dart b/packages/flutter_tools/test/src/context.dart
index f2b6cc96ba..3830765362 100644
--- a/packages/flutter_tools/test/src/context.dart
+++ b/packages/flutter_tools/test/src/context.dart
@@ -201,16 +201,15 @@ class FakeDeviceManager implements DeviceManager {
   }
 
   @override
-  Stream<Device> getAllConnectedDevices() => Stream<Device>.fromIterable(devices);
+  Future<List<Device>> getAllConnectedDevices() async => devices;
 
   @override
-  Stream<Device> getDevicesById(String deviceId) {
-    return Stream<Device>.fromIterable(
-        devices.where((Device device) => device.id == deviceId));
+  Future<List<Device>> getDevicesById(String deviceId) async {
+    return devices.where((Device device) => device.id == deviceId).toList();
   }
 
   @override
-  Stream<Device> getDevices() {
+  Future<List<Device>> getDevices() {
     return hasSpecifiedDeviceId
         ? getDevicesById(specifiedDeviceId)
         : getAllConnectedDevices();