What are the cheapest airlines flying from Boise to Porto round-trip?

Our cheapest airline available from Boise to Porto is United Airlines. Our recent data shows that you can find tickets from as low as $737 on this airline. An additional option worth looking into is Delta, starting at $783.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

What is the cheapest time of day to fly from BOI to OPO?

When flying from Boise to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Most accurate provider : When it comes to deals on Boise-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Boise-Porto flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Boise-Porto flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Boise-Porto flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Boise to Porto that include hotel bookings?

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

How can I find direct flights from Boise to Porto?

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

Can I find deals for business class flights from Boise to Porto?

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

Find Cheap Flights from Boise to Porto

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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Find flight deals from Boise to Porto

Most accurate provider	Ovago 3 stars
Most trusted provider	Ovago 3 stars

Provider with most accurate pricing for Boise Air Term. Gowen Fld-Porto flight deals.

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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Porto flights.

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Compare providers for flights from Boise to Porto

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to Porto in August.

Provider	Price Accuracy	Trust Score*
Ovago	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Boise-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Boise-Porto flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Boise-Porto flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Boise-Porto flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boise to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Boise with our price prediction graph.

BOI-OPO

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.

Reviews of airlines servicing Porto

Peruse reviews from past customers who have flown with Delta and United Airlines from Boise to Porto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.8

Good

8,497 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Delta

7.8

Good

8,497 reviews

Delta

7.8

Good

8,497 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

United Airlines

7.4

Good

10,062 reviews

Delta

7.8

Good

8,497 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Related info for your journey

What are the cheapest airlines flying from Boise to Porto round-trip?
Our cheapest airline available from Boise to Porto is United Airlines. Our recent data shows that you can find tickets from as low as $737 on this airline. An additional option worth looking into is Delta, starting at $783.
Can I find deals for flights from Boise to Porto that include hotel bookings?
Yes. In addition to deals on Boise to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Boise to Porto?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to Porto.
Can I find deals for business class flights from Boise to Porto?
Yes. Cheapflights offers flight deals from Boise to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Top 2 airlines flying from Boise to Porto

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$737	Average$1,050	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$783	Average$896	FlexibilityNo cancel fee	On-timeN/A

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Cheap flights from Boise (BOI) to Porto (OPO)

Find cheap flights from Boise to Porto with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Boise to Porto

Most accurate provider

Most trusted provider

Compare providers for flights from Boise to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to Porto in August.

Best time to book a flight from Boise to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Boise with our price prediction graph.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated August 1, 2026.

Peruse reviews from past customers who have flown with Delta and United Airlines from Boise to Porto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What are the cheapest airlines flying from Boise to Porto round-trip?

Can I find deals for flights from Boise to Porto that include hotel bookings?

How can I find direct flights from Boise to Porto?

Can I find deals for business class flights from Boise to Porto?

Traveling to a place near Porto?

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Alternative routes for Boise to Porto

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Complete your trip

Complete your trip to Porto by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Boise to Porto by cabin class

Find flights from Boise to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Boise and Porto flights

Browse other Boise and Porto flight options. Last updated on August 1, 2026.

Other flights from Boise

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Other flights to Porto

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Top 2 airlines flying from Boise to Porto

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