Cheap flights from Boston to Sintra-Cascais Natural Park

View AU$381 flight on Tue, 17 Feb. 2026Opens in a new window

Popular airlines from Boston to Sintra-Cascais Natural Park

  • American Airlines

    American Airlines

  • British Airways

    British Airways

  • Aer Lingus

    Aer Lingus

  • Iberia

    Iberia

  • KLM

    KLM

  • Lufthansa

    Lufthansa

  • Swiss International Air Lines

    Swiss International Air Lines

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Cheap Flights from Boston (BOS) to Sintra-Cascais Natural Park (LIS)

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.

Aer Lingus
Sun, 14 Sep. - Tue, 23 Sep.
BOS
Boston
LIS
Lisbon
AU$769 Return, found 2 days ago
AU$769
Return
found 2 days ago
Select Aer Lingus flight, departing Sun, 14 Sep. from Boston to Lisbon, returning Tue, 23 Sep., priced at AU$769 found 2 days ago
Aer Lingus
Sun, 14 Sep. - Tue, 23 Sep.
BOS
Boston
LIS
Lisbon
AU$785 Return, found 2 days ago
AU$785
Return
found 2 days ago
Select Aer Lingus flight, departing Sun, 14 Sep. from Boston to Lisbon, returning Tue, 23 Sep., priced at AU$785 found 2 days ago
TAP Portugal
Fri, 7 Nov. - Sun, 9 Nov.
BOS
Boston
LIS
Lisbon
AU$792 Return, found 5 days ago
AU$792
Return
found 5 days ago
Select TAP Portugal flight, departing Fri, 7 Nov. from Boston to Lisbon, returning Sun, 9 Nov., priced at AU$792 found 5 days ago
Swiss International Air Lines
Sun, 14 Sep. - Tue, 23 Sep.
BOS
Boston
LIS
Lisbon
AU$849 Return, found 2 days ago
AU$849
Return
found 2 days ago
Select Swiss International Air Lines flight, departing Sun, 14 Sep. from Boston to Lisbon, returning Tue, 23 Sep., priced at AU$849 found 2 days ago
British Airways
Sun, 14 Sep. - Tue, 23 Sep.
BOS
Boston
LIS
Lisbon
AU$898 Return, found 2 days ago
AU$898
Return
found 2 days ago
Select British Airways flight, departing Sun, 14 Sep. from Boston to Lisbon, returning Tue, 23 Sep., priced at AU$898 found 2 days ago
Delta
Sun, 14 Sep. - Tue, 23 Sep.
BOS
Boston
LIS
Lisbon
AU$920 Return, found 2 days ago
AU$920
Return
found 2 days ago
Select Delta flight, departing Sun, 14 Sep. from Boston to Lisbon, returning Tue, 23 Sep., priced at AU$920 found 2 days ago

Find the cheapest month to fly from Boston (BOS) to Lisbon (LIS)

November is typically the cheapest month to fly

From AU$520 - AU$1,109 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.