Cheap flights from Portsmouth to Steamboat Springs

View AU$137 flight on Sat, 23 Aug. 2025Opens in a new window

Popular airlines from Portsmouth to Steamboat Springs

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Portsmouth (BOS) to Steamboat Springs (CIG)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, 5 Sep. - Fri, 12 Sep.
BOS
Boston
DEN
Denver
AU$379 Return, found 6 days ago
AU$379
Return
found 6 days ago
Select American Airlines flight, departing Fri, 5 Sep. from Boston to Denver, returning Fri, 12 Sep., priced at AU$379 found 6 days ago
Delta
Fri, 5 Sep. - Fri, 12 Sep.
BOS
Boston
DEN
Denver
AU$387 Return, found 6 days ago
AU$387
Return
found 6 days ago
Select Delta flight, departing Fri, 5 Sep. from Boston to Denver, returning Fri, 12 Sep., priced at AU$387 found 6 days ago
American Airlines
Fri, 19 Sep. - Mon, 22 Sep.
BOS
Boston
DEN
Denver
AU$412 Return, found 1 day ago
AU$412
Return
found 1 day ago
Select American Airlines flight, departing Fri, 19 Sep. from Boston to Denver, returning Mon, 22 Sep., priced at AU$412 found 1 day ago
American Airlines
Fri, 5 Sep. - Fri, 12 Sep.
BOS
Boston
DEN
Denver
AU$417 Return, found 6 days ago
AU$417
Return
found 6 days ago
Select American Airlines flight, departing Fri, 5 Sep. from Boston to Denver, returning Fri, 12 Sep., priced at AU$417 found 6 days ago
United
Fri, 5 Sep. - Fri, 12 Sep.
BOS
Boston
DEN
Denver
AU$426 Return, found 6 days ago
AU$426
Return
found 6 days ago
Select United flight, departing Fri, 5 Sep. from Boston to Denver, returning Fri, 12 Sep., priced at AU$426 found 6 days ago
Alaska Airlines
Fri, 19 Sep. - Mon, 22 Sep.
BOS
Boston
DEN
Denver
AU$520 Return, found 1 day ago
AU$520
Return
found 1 day ago
Select Alaska Airlines flight, departing Fri, 19 Sep. from Boston to Denver, returning Mon, 22 Sep., priced at AU$520 found 1 day ago

Find the cheapest month to fly from Boston (BOS) to Denver (DEN)

October is typically the cheapest month to fly

From AU$181 - AU$364 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.