I've compiled this list of commands from the Amazon Help Pages.
Do more with your Echo
Follow the tips below to finish setting up your account and services so that you can start having fun with your Amazon Echo.
Play custom stations from iHeartRadio
Set up or link an iHeartRadio account to listen to commercial-free custom stations based on artist, mood, or genre. Link an iHeartRadio account.
Get location-specific information
Confirm your ZIP code to set the correct time zone and provide location for local news and weather forecasts. Go to Settings > select your Echo > Echo device location.
Customize your news updates
Select news categories and programs you will listen to when you request your Flash Briefing. Customize your Flash Briefing.
Add your music to play on Echo
Importing your music to Amazon Music allows you to play your songs, albums, and artists whenever you choose. With Amazon Music you can import your music from iTunes, Windows Media player, or your computer's music folders. Learn more about adding your music.
Bluetooth voice requests
Before you can stream audio from your smartphone or tablet to Amazon Echo, you need to pair it. After you pair your mobile device with Amazon Echo, you can immediately connect it to Amazon Echo when Bluetooth is turned on and your mobile device is in range.
Alexa, pair Bluetooth.
Alexa, disconnect my phone / tablet.
Alexa, connect my phone / tablet.
You can also use your voice to control the audio from your smartphone or tablet when it's connected to your Amazon Echo via Bluetooth. After you connect your mobile device to Amazon Echo, open one of your favorite music or audio apps (for example, Audible), press play, and then speak to your Amazon Echo.
Alexa, play
Alexa, pause
Alexa, previous
Alexa, next
Alexa, stop
Alexa, resume
Alexa, restart
Note: If you request songs, albums, artists, or playlists, Amazon Echo will pause playback on your mobile device and disconnect from it. Music from your Amazon Music library will play instead. To play music over Bluetooth again, say "Alexa, connect" and press play on your mobile device.
Clock & Timer
You can create one timer or one alarm by voice. You can also adjust the alarm or timer volume independent of other sounds by going to Settings > select your device > Sounds > Alarm and Timer Volume.
Alexa, wake me up at 6 in the morning.
Alexa, set the alarm for 7:30 a.m.
Alexa, set the timer for 10 minutes.
Alexa, how much time is left on my timer?
Alexa, what time is it?
Alexa, what's the date?
Alexa, when's my alarm set for?
Alexa, cancel the alarm.
Alexa, stop. (when alarm or timer is sounding)
Alexa, snooze. (when alarm is sounding)
Discover & buy music
Easily find songs and albums using your voice. While listening to samples, say "Alexa, buy this." Manage voice purchase settings.
Alexa, shop for new music by David Guetta.
Alexa, what's popular from Regina Spektor?
Alexa, sample songs by The Black Keys.
Alexa, play samples by Louis Armstrong.
Alexa, find Walking with a Ghost by Tegan and Sara.
Alexa, buy Wrecking Ball by Miley Cyrus.
Facts & fun
You can ask your device all kinds of questions. Try asking about famous people, dates and places.
Alexa, why is the sky blue?
Alexa, who wrote Game of Thrones?
Alexa, tell me a joke.
Alexa, Simon says, "Jump."
Alexa, how many ounces are in a cup?
Alexa, how tall is Mount Everest?
Alexa, what's the capital of Spain?
Alexa, how far is the moon?
Alexa, what was Bruce Springsteen's first album?
Alexa, what's the square root of 64?
Alexa, who is the lead singer of Green Day?
Alexa, Simon says + words you want Echo to repeat.
Alexa, how far is it from here to the North Pole?
Alexa, what's the definition of paradox?
Alexa, how many people live in New Orleans?
Alexa, what is 5 miles in kilometers?
Alexa, when is Thanksgiving this year?
Alexa, how old is Barack Obama?
Alexa, Wikipedia: Fantasy Football.
Alexa, Wikipedia: Boardwalk Empire.
Flash Briefing
Listen to the latest news programs, hear customized news read by your device, and receive weather updates in your Flash Briefing. Customize Your Flash Briefing.
Alexa, what's my Flash Briefing?
Alexa, what's in the news?
Alexa, next.
Alexa, previous.
Alexa, pause.
Household profiles
Add another adult to your Amazon household so your device will be able to play music from both accounts, access joint shopping and to-do lists, and set individual preferences for Flash Briefing.
Alexa, switch accounts.
Alexa, which profile is this?
Music commands
Alexa, what's playing?
Alexa, turn it up.
Alexa, softer.
Alexa, volume 4.
Alexa, mute.
Alexa, stop the music.
Alexa, pause.
Alexa, resume.
Alexa, next song.
Alexa, loop.
Alexa, buy this song. (Amazon Music)
Alexa, buy this album. (Amazon Music)
Alexa, add this song. (Prime Music)
Alexa, I like this song (when a Pandora / iHeartRadio song is playing).
Alexa, thumbs down (when a Pandora / iHeartRadio song is playing).
Music requests
You can play your own music by importing songs to your Amazon Music library. Import music.
Alexa, play music by Johnny Cash.
Alexa, play Sail by AWOLNATION.
Alexa, shuffle my lounge playlist.
Alexa, play my new music by Mariah Carey.
Alexa, play Skrillex.
Alexa, play the song Thrift Shop.
Alexa, play the album Bob Dylan's Greatest Hits.
Alexa, play some blues.
Alexa, shuffle my new music.
Alexa, play the song I just bought.
Alexa, play some music.
Prime Music
Prime members can enjoy over a million songs and hundreds of playlists for free.
Alexa, play some Prime Music.
Alexa, play music by Icona Pop.
Alexa, play the Sunny Day Classical playlist.
Alexa, add this song.
Alexa, play Santana on Prime music.
Alexa, play I Won't Give Up by Jason Mraz.
Alexa, play some jazz from Prime Music.
Shopping & To-Do Lists
Alexa, add bread to my shopping list.
Alexa, I need to make a dentist appointment.
Alexa, put change oil on my to-do list.
Alexa, I need to buy paper towels.
Alexa, create a to-do.
Sports
Ask Amazon Echo the score for last night's game, or find out when your favorite team plays their next game. Amazon Echo provides scores for NBA, NHL, NCAA, NFL, MLB, and MLS games.
Alexa, what was the score of the Toronto Raptors game?
Alexa, did the Dallas Stars win?
Alexa, when do the Arizona Wildcats play next?
Stations, shows & more
Listen to podcasts, shows, and live radio from TuneIn or iHeartRadio. Create custom radio stations from iHeartRadio or Pandora. Link your iHeartRadio and/or Pandora account with Amazon Echo.
Alexa, play a Coldplay station from Pandora.
Alexa, play the program Radiolab.
Alexa, play the station NPR.
Alexa, play 97.3 FM on TuneIn.
Alexa, play Fox Sports on iHeartRadio.
Traffic
Amazon Echo can tell you about the traffic conditions on your daily commute. First, enter your starting point and destination in the Amazon Echo App. Then, ask your Amazon Echo about the traffic on your route.
Alexa, how is traffic?
Alexa, what’s my commute?
Alexa, what’s traffic like right now?
Use these anytime
Alexa, stop.
Alexa, volume six. (0-10)
Alexa, mute.
Alexa, unmute.
Alexa, repeat.
Alexa, cancel.
Alexa, louder.
Alexa, turn it down.
Alexa, help.
Voicecast & Autocast
Send additional details about news, weather, and more to your Fire tablet. You can also turn on Autocast to see the requested content automatically on your tablet. Go to Settings > Amazon Echo, and then use the switch to turn Voicecast and Autocast on.
Alexa, send that to my Fire tablet.
Alexa, send that to my tablet.
Alexa, show this on Sarah's Fire.
Voice Training
Train your device to better recognize you by completing a voice training session. Start voice training.
Weather
Confirm your device has a zip code for local weather. Visit device settings.
Alexa, what's the weather?
Alexa, will it rain tomorrow?
Alexa, what's the forecast this weekend?
Alexa, what's the weather in Dallas?
Alexa, what will the weather be like in Boston tomorrow?
Alexa, what's the weather in Silver City, New Mexico?
Alexa, what's the extended forecast for Chicago?
Alexa, what will the weather be like in San Diego on Thursday?
Alexa, is it going to snow on Monday?