The cheapest times to fly from OPO to TRI are

  • April 2nd to May 6th (except the week of April 23rd)
  • May 21st to June 17th (except the week of June 4th)
  • November 5th to December 2nd
  • December 24th to March 4th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from OPO to TRI is late January. Prices can be as high as $4295 for Friday flights during early to mid December, or as low as $842 for Monday flights around late January.


When to Fly to Bristol

Flying from Porto (OPO) to Bristol/Johnson City/Kingsport, TN (TRI) will usually cost between $848 to $1960 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $873. Due to high demand the most expensive time to fly is early to mid December, with an average price of $1817. Planning your trip to low-cost times can easily save you $943 on economy flights and even more on first-class flights. Generally, any price below $1133 can be considered a good price for a round-trip OPO to TRI flight.

See below for a graph of average weekly prices for the OPO to TRI route. All prices are for round-trip tickets in USD.

OPO to TRI Flight Prices

Compared to other flights, the OPO to TRI flight is slightly more expensive than the average and costs more than the average flight leaving from Porto. The average price per mile (for a direct flight) is $0.18, which is below average.


Flight Prices by Day of the Week

Monday is usually the cheapest day to fly to TRI, and Tuesday the cheapest day to fly back into OPO. Fridays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $494 (24%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Monday and returning a week later will cost an average of $1053. Return trip prices are from the TRI to OPO flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from OPO to TRI can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 7 hour 56 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from OPO to TRI while comparing.

Destination alternative #1: Greenville-Spartanburg International Airport (GSP) in Greer, SC

  • 110 miles (177 km) away from TRI
  • Usually 16.59% less expensive than TRI
  • 1-layover flights available

See OPO to GSP flights

Destination alternative #2: Charlotte Douglas International Airport (CLT) in Charlotte, NC

  • 119 miles (192 km) away from TRI
  • Usually 16.33% less expensive than TRI
  • 1-layover flights available

See OPO to CLT flights

Destination alternative #3: Piedmont Triad International Airport (GSO) in Greensboro/High Point, NC

  • 140 miles (225 km) away from TRI
  • Usually 13.59% less expensive than TRI
  • 1-layover flights available

See OPO to GSO flights

Destination alternative #4: Asheville Regional Airport (AVL) in Asheville, NC

  • 72 miles (116 km) away from TRI
  • Usually 11.92% less expensive than TRI
  • 1-layover flights available

See OPO to AVL flights


Flight Hacking OPO to TRI

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from OPO to TRI — but Champion Traveler does!

Hack #1: New York, NY (OPO > JFK > TRI)

  • Price for both tickets: $766
  • Average savings: $367 (32.37%)

See OPO to LGA flights

Hack #2: New York, NY (OPO > LGA > TRI)

  • Price for both tickets: $773
  • Average savings: $361 (31.82%)

See OPO to JFK flights

Hack #3: Newark, NJ (OPO > EWR > TRI)

  • Price for both tickets: $780
  • Average savings: $353 (31.16%)

See OPO to EWR flights


Flight Questions Answered

Still have questions about flying from OPO to TRI? We’ve got answers.

Which airlines fly this route?

You can find 11 major airlines flying this route most often: Air Canada, Air France, American, British Airways, Brussels Airlines, Delta, El Al, Iberia, KLM, Tap Air Portugal, United, and potentially more during busy seasons.

How far away is it from Tri Cities Airport to Porto Airport?

The distance between the two airports is roughly 3858 miles or 6209 kilometers.

How long does it take to fly from OPO to TRI?

The real-world flight time for a nonstop OPO to TRI flight is about 7 hour 56 minutes.

How many flights go between Porto and Bristol/Johnson City/Kingsport, TN?

It depends on the day of the week and the date, but a typical day might have around 7 available flights from OPO to TRI.


Airport Location Info


Departing Airport

Origination code OPO
Origination airport name Porto Airport
City Porto
Country Portugal
Latitude 41.2
Longitude -8.7

Return Airport

Destination code TRI
Destination airport name Tri Cities Airport
City Bristol/Johnson City/Kingsport, TN
Country the United States
Latitude 36.5
Longitude -82.4


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.