Cheap flights from San Francisco to Casco Bay Islands

View AU$191 flight on Tue, 23 Sep. 2025Opens in a new window

Popular airlines from San Francisco to Casco Bay Islands

  • American Airlines

    American Airlines

  • Alaska Airlines

    Alaska Airlines

  • Delta

    Delta

  • United

    United

  • 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 San Francisco (SJC) to Casco Bay Islands (PWM)

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
Mon, 29 Sep. - Mon, 6 Oct.
SFO
San Francisco
PWM
Portland
AU$616 Return, found 1 day ago
AU$616
Return
found 1 day ago
Select American Airlines flight, departing Mon, 29 Sep. from San Francisco to Portland, returning Mon, 6 Oct., priced at AU$616 found 1 day ago
American Airlines
Mon, 29 Sep. - Mon, 6 Oct.
SFO
San Francisco
PWM
Portland
AU$624 Return, found 1 day ago
AU$624
Return
found 1 day ago
Select American Airlines flight, departing Mon, 29 Sep. from San Francisco to Portland, returning Mon, 6 Oct., priced at AU$624 found 1 day ago
Delta
Mon, 29 Sep. - Mon, 6 Oct.
SFO
San Francisco
PWM
Portland
AU$641 Return, found 1 day ago
AU$641
Return
found 1 day ago
Select Delta flight, departing Mon, 29 Sep. from San Francisco to Portland, returning Mon, 6 Oct., priced at AU$641 found 1 day ago
American Airlines
Mon, 29 Sep. - Mon, 6 Oct.
SFO
San Francisco
PWM
Portland
AU$660 Return, found 1 day ago
AU$660
Return
found 1 day ago
Select American Airlines flight, departing Mon, 29 Sep. from San Francisco to Portland, returning Mon, 6 Oct., priced at AU$660 found 1 day ago
Delta
Mon, 29 Sep. - Mon, 6 Oct.
SFO
San Francisco
PWM
Portland
AU$666 Return, found 1 day ago
AU$666
Return
found 1 day ago
Select Delta flight, departing Mon, 29 Sep. from San Francisco to Portland, returning Mon, 6 Oct., priced at AU$666 found 1 day ago
United
Mon, 29 Sep. - Mon, 6 Oct.
SFO
San Francisco
PWM
Portland
AU$778 Return, found 1 day ago
AU$778
Return
found 1 day ago
Select United flight, departing Mon, 29 Sep. from San Francisco to Portland, returning Mon, 6 Oct., priced at AU$778 found 1 day ago

Find the cheapest month to fly from San Francisco (SFO) to Portland (PWM)

September is typically the cheapest month to fly

From AU$310 - AU$1,033 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.