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$430+ Cheap flights from Oakland, CA (OAK) to Portugal

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — LIS
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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Cheap flight deals from Oakland to Portugal

Keep the following information in mind while searching for Oakland to Portugal flight deals. Data was last updated October 29, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$504
(Delta)

One-way from

$430
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$746
Provider with most accurate pricing for San Francisco-Lisbon Humberto Delgado flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Lisbon Humberto Delgado flights.
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From Oakland to Portugal
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One-way flight from Oakland to Portugal
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Highest demand for flights based on searches. 15% potential increase in price ($149 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Oakland to Portugal

Cheapest flights from Oakland to Portugal
Explore the most affordable flight options available from Oakland to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/165:55 amOAK - LIS
2 stops27h 35mDelta
Wed 12/1011:25 amLIS - OAK
2 stops44h 43mDelta
Deal found 10/27$504
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:51 pmOAK - LIS
2 stops38h 19mDelta
Thu 12/1111:25 amLIS - OAK
2 stops44h 43mDelta
Deal found 10/27$509
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/165:55 amOAK - LIS
2 stops18h 05mDelta
Fri 12/55:30 amLIS - OAK
2 stops18h 34mDelta
Deal found 10/27$510
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:51 pmOAK - LIS
2 stops40h 39mDelta
Fri 12/55:30 amLIS - OAK
2 stops18h 34mDelta
Deal found 10/27$515
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/275:55 amOAK - LIS
2 stops18h 05mDelta
Wed 12/311:25 amLIS - OAK
2 stops44h 43mDelta
Deal found 10/29$528
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2612:28 pmOAK - LIS
2 stops35h 32mDelta
Wed 12/311:25 amLIS - OAK
2 stops36h 39mDelta
Deal found 10/29$539
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:55 amOAK - OPO
2 stops44h 35mDelta
Sun 12/711:15 amOPO - OAK
2 stops44h 53mDelta
Deal found 10/27$546
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/165:55 amOAK - LIS
2 stops25h 15mDelta
Sun 12/711:25 amLIS - OAK
2 stops36h 39mDelta
Deal found 10/27$554
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:51 pmOAK - LIS
2 stops38h 19mDelta
Sat 12/611:25 amLIS - OAK
2 stops44h 43mDelta
Deal found 10/27$559
This American Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/22:31 pmOAK - LIS
2 stops19h 09mMultiple Airlines
Mon 12/811:05 amLIS - OAK
2 stops31h 36mMultiple Airlines
Deal found 10/27$606
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/245:55 amOAK - LIS
2 stops18h 05mDelta
Wed 12/311:25 amLIS - OAK
2 stops44h 43mDelta
Deal found 10/29$611
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/194:51 pmOAK - LIS
2 stops31h 09mDelta
Thu 12/1111:25 amLIS - OAK
2 stops44h 43mDelta
Deal found 10/27$612

Cheapflights Fare Finder

 
Customize your flight search to find flights from Oakland to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 29, 2025.
Use the filters below to find and compare flights from Oakland to Portugal that are best for you.

Fly from

Oakland

Fly to

Portugal

Route

Depart

Return

Price

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Sun 11/16

5:55 am-5:30 pm

2 stops27h 35m

Lisbon Humberto Delgado

Tue 12/9

11:25 am-4:04 pm

2 stops36h 39m

$504

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Tue 11/18

5:55 am-3:10 pm

2 stops25h 15m

Lisbon Humberto Delgado

Mon 12/8

11:25 am-12:08 am

2 stops44h 43m

$504

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Mon 11/17

5:55 am-3:10 pm

2 stops25h 15m

Lisbon Humberto Delgado

Wed 12/10

11:25 am-4:04 pm

2 stops36h 39m

$504

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Sun 11/16

5:55 am-5:30 pm

2 stops27h 35m

Lisbon Humberto Delgado

Wed 12/10

11:25 am-12:08 am

2 stops44h 43m

$504

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Sun 11/23

4:51 pm-8:00 am

2 stops31h 09m

Lisbon Humberto Delgado

Wed 12/3

11:25 am-4:04 pm

2 stops36h 39m

$515

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Wed 11/26

12:28 pm-8:00 am

2 stops35h 32m

Lisbon Humberto Delgado

Wed 12/3

11:25 am-4:04 pm

2 stops36h 39m

$539

OaklandPorto

OAK - OPO

OAKOPO

Oakland

Wed 12/3

12:30 pm-10:30 am

2 stops38h 00m

Porto

Sun 12/7

11:15 am-12:08 am

2 stops44h 53m

$546

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Wed 11/19

12:28 pm-6:30 pm

2 stops22h 02m

Lisbon Humberto Delgado

Sun 12/7

11:25 am-4:04 pm

2 stops36h 39m

$559

OaklandLisbon

OAK - LIS

OAKLIS

Oakland

Sat 11/15

4:51 pm-3:10 pm

2 stops38h 19m

Lisbon Humberto Delgado

Sun 12/7

11:25 am-4:04 pm

2 stops36h 39m

$559

OaklandPorto

OAK - OPO

OAKOPO

Oakland

Wed 2/25

5:55 am-10:30 am

2 stops20h 35m

Porto

Mon 3/2

11:15 am-4:34 pm

2 stops37h 19m

$566

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 39 results
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Best time to book a flight from Oakland to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal from Oakland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Oakland to Portugal

What is the cheapest month to book a flight from Oakland, California to Portugal?

Currently, November is the cheapest month in which you can book a flight from Oakland, California to Portugal (average of $507). Flying from Oakland, California to Portugal in June is currently the most expensive (average of $782). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from OAK to PT?

Find hourly flight availability from Oakland to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 29, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 20% on flights from Oakland, California to Portugal by exploring options for tickets in the evening.

Related info for your journey

Find useful and relevant information for your journey from Oakland to Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Oakland to Portugal?

    If you book a flight to Portugal from Oakland, you will be flying from Oakland, which is the city’s only airport. Oakland (OAK) is located 7.0 mi from the center of Oakland.

  • How long is the flight from Oakland, California to Portugal?

    For as low as $634, Delta can have you in Portugal from Oakland, California in 20h 35m. Oakland, California and Portugal are separated by a distance of 5555 mi. This flight may include one or multiple stops.

  • What are the most popular routes from Oakland, California to Portugal?

    The most popular flight routes from Oakland, California to Portugal are Oakland - Lisbon Humberto Delgado, Oakland - Faro and Oakland - Porto.

  • Can I find deals for flights from Oakland to Portugal that include hotel bookings?

    Yes. In addition to deals on Oakland to Portugal flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Oakland to Portugal?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Oakland to Portugal.

  • Can I find deals for business class flights from Oakland to Portugal?

    Yes. Cheapflights offers flight deals from Oakland to Portugal by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Oakland, California to Portugal?

    Currently, November is the cheapest month in which you can book a flight from Oakland, California to Portugal (average of $507). Flying from Oakland, California to Portugal in June is currently the most expensive (average of $782). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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