Cheap flights from Chicago to Aliados

View NZ$819 flight on Mon, 15 Sep. 2025Opens in a new window

Popular airlines from Chicago to Aliados

  • 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 Chicago (CHI) to Aliados (OPO)

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.

Swiss International Air Lines
Sun., 11 May - Sat., 24 May
ORD
Chicago
OPO
Porto
NZ$1,214 Return, found 16 hours ago
NZ$1,214
Return
found 16 hours ago
Select Swiss International Air Lines flight, departing Sun., 11 May from Chicago to Porto, returning Sat., 24 May, priced at NZ$1,214 found 16 hours ago
Lufthansa
Sun., 11 May - Sat., 24 May
ORD
Chicago
OPO
Porto
NZ$1,372 Return, found 16 hours ago
NZ$1,372
Return
found 16 hours ago
Select Lufthansa flight, departing Sun., 11 May from Chicago to Porto, returning Sat., 24 May, priced at NZ$1,372 found 16 hours ago
Delta
Sun., 11 May - Sat., 24 May
ORD
Chicago
OPO
Porto
NZ$1,481 Return, found 16 hours ago
NZ$1,481
Return
found 16 hours ago
Select Delta flight, departing Sun., 11 May from Chicago to Porto, returning Sat., 24 May, priced at NZ$1,481 found 16 hours ago
KLM
Sun., 11 May - Sat., 24 May
ORD
Chicago
OPO
Porto
NZ$1,568 Return, found 16 hours ago
NZ$1,568
Return
found 16 hours ago
Select KLM flight, departing Sun., 11 May from Chicago to Porto, returning Sat., 24 May, priced at NZ$1,568 found 16 hours ago
American Airlines
Sun., 11 May - Sat., 24 May
ORD
Chicago
OPO
Porto
NZ$1,629 Return, found 16 hours ago
NZ$1,629
Return
found 16 hours ago
Select American Airlines flight, departing Sun., 11 May from Chicago to Porto, returning Sat., 24 May, priced at NZ$1,629 found 16 hours ago
TAP Portugal
Wed., 4 Jun. - Wed., 11 Jun.
ORD
Chicago
OPO
Porto
NZ$1,710 Return, found 6 days ago
NZ$1,710
Return
found 6 days ago
Select TAP Portugal flight, departing Wed., 4 Jun. from Chicago to Porto, returning Wed., 11 Jun., priced at NZ$1,710 found 6 days ago
*Available to Expedia members.