20 Mile Glacier Helicopter Rafting & Glacier Walk


Our most exclusive and remote Helicopter Rafting tour!  Experience an entire river watershed from the Glacier to the Turnagain Arm Ocean.

  • 15 Minute Scenic Glacier Flight of the Chugach Mountains
  • 15 Minute Glacier Landing Stopover onto the Glacier Ice of 20 Mile Glacier
  • 3-4 Hour Scenic Glacier Rafting Tour

Access the remote glaciated Chugach Mountains with Alpine Air Alaska; there is no better view than from a Robinson R44 helicopter.  Buzz the Twenty Mile Glacier and see the grand scope of the Chugach Mountains.  Land on the iceberg-laden Twenty-Mile Lake for your private Alaska raft adventure down Twenty-Mile River.  Float 12 stunning miles downriver to an ocean pick-up on Turnagain Arm at the Seward Highway. Keep a good lookout for wildlife: bears, moose, bald eagles, and salmon.

2024 Summer Season: June 1 – September 15  (SELECT TOUR DATE on CHECKOUT PAGE)

A minimum of 3 Guests is Required to book this Heli Rafting Adventure.

My favorite aspect of this trip is how few people actually visit 20-Mile Glacier, but those who do, get to experience raw, untouched nature – it is truly breathtaking upon arrival.  – Justin Siemens – Past Chugach Adventures’ Operations Manager and Guide.   Born & Raised in Anchorage, AK.


  • 8:40 AM, 10:30 AM, or 12:15 PM Departure Times.
  • Minimum of 3 Guests required to book.  For parties of 2, we recommend our Comet Heli Hiking and Rafting Tour.
  • Helicopter Rafting departure from the Alpine Air Hangar at the Girdwood Airport
  • A 15-minute unforgettable scenic flight of the surrounding Chugach Mountains to Twenty Mile Glacier Lake, Alaska.
  • 15-Minute Glacier Landing with Alpine Air on 20-Mile Glacier
  • Catered gourmet lunches, drinks, and snacks are provided.  (Please let us know ahead of time of any dietary restrictions: vegetarian, gluten-free, allergies, etc.)
  • Rain ponchos, rubber boots, personal flotation devices/life jackets are provided.
  • Twenty Mile River Float is a Class I & II (With High Water) braided river, with no big rapids.  Most guests will not get splashed with water.  If you are concerned about getting splashed you can request a spot in the raft that is NOT “splashy” when speaking to your guide.  This trip is suitable for ages 6 & up.

What to Bring:

  • Thick socks (to wear with our rubber boots)
  • Warm clothes (wear synthetic layers and bring a raincoat)
  • Warm hat
  • Gloves
  • Binoculars
  • Camera

Departure Times are dependent on Alpine Air Helicopter Charter availability and guest request.
DEPARTURE OPTIONS: 8 AM, 8:40 AM, 10:30 AM, or 12:15 PM

Approximate Itinerary for 12:15 Departure:

12:15 AM – Helicopter Rafting Departure Time (With R44- 3 Passengers, and R66 – 4 passengers).  If R66 is Available.
12:15 – 12:30 – Scenic Glacier Flight of Upper 20 Mile Glacier
12:30 – 12:45 PM – 15 Minute Glacier Landing
12:45 – 12:55 PM – Bump to Raft at the Southern End of 20 Mile Glacier Lake, where your Guide and Raft await.
Rafting Portion of your adventure:
1:30 – 4 PM – Raft 12 River Miles Down the 20 Mile River Valley to the Seward Highway.  Stop along the way for lunch and look for tracks and wildlife.
4:30 PM – Approximate Pick-Up Time at the Seward Highway.
Total Rafting Time is dependent on the water level in the river and wind on the lower stretches of the river.  In low water, the rafting is longer, whereas with high water the time on the water is faster.
5:30 PM – Return Transfer to Girdwood.

Cancellation Policy for Day Tour Bookings:

Cancellations made 10 days or more in advance are 90% refundable.  

Cancellations within 10 days are nonrefundable.  

Book Now