Ontario (ONT) to Lisbon (LIS) cheap flight deal from $505 USD in economy class

AAAmerican Airlines

IBIberia Airlines

Round Trip•Economy

ONT

Ontario International Airport

Ontario, United States

LIS

Portela Airport

Lisbon, Portugal

$928 USD

-46%$505 USD

Verified Sep 21, 2025 at 4:49 PM

September 2025

Today

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21$1,386 22$1,386 23$1,536 24$1,536 25$1,596 26$1,595 27$1,536 28$629 29$628 30$842 1$1,142 2$1,002 3$1,002 4$1,134 5$948

Limited Availability

12% of dates checked are available within 10% of the lowest price

Monday, September 29th, 2025

10 round-trip options

Returning

Sat, Oct 4, 2025•5 Day Trip

$1,752 USD

Google Flights

Returning

Sun, Oct 5, 2025•6 Day Trip

$1,144 USD

Google Flights

Returning

Mon, Oct 6, 2025•7 Day Trip

$1,048 USD

Google Flights

Returning

Tue, Oct 7, 2025•8 Day Trip

$981 USD

Google Flights

Returning

Wed, Oct 8, 2025•9 Day Trip

$797 USD

Google Flights

Returning

Thu, Oct 9, 2025•10 Day Trip

$781 USD

Google Flights

Returning

Fri, Oct 10, 2025•11 Day Trip

$981 USD

Google Flights

Returning

Sat, Oct 11, 2025•12 Day Trip

$628 USD

Google Flights

Returning

Sun, Oct 12, 2025•13 Day Trip

$1,256 USD

Google Flights

Returning

Mon, Oct 13, 2025•14 Day Trip

$1,287 USD

Google Flights