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301 € Cheap Flights from Tri-Cities to San Diego

Compare Tri-Cities to San Diego flight deals

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Flight deals from Tri-Cities Airport to San Diego

Looking for a cheap last-minute deal or the best return flight from Tri-Cities Airport to San Diego? If you want to travel next month, return fares start from 301 €. Find the lowest prices on one-way and return tickets right here.
San Diego.301 € per passenger.Departing Fri, 10 Apr, returning Fri, 17 Apr.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Fri, 10 Apr, arriving in San Diego International.Inbound indirect flight with Delta, departs from San Diego International on Fri, 17 Apr, arriving in Tri-Cities.Price includes taxes and charges.From 301 €, select.
San Diego.419 € per passenger.Departing Thu, 19 Mar, returning Wed, 25 Mar.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Thu, 19 Mar, arriving in San Diego International.Inbound indirect flight with Delta, departs from San Diego International on Wed, 25 Mar, arriving in Tri-Cities.Price includes taxes and charges.From 419 €, select.
San Diego.424 € per passenger.Departing Sun, 29 Mar, returning Thu, 2 Apr.Return flight with Allegiant Air and Frontier Airlines.Outbound indirect flight with Allegiant Air, departs from Tri-Cities on Sun, 29 Mar, arriving in San Diego International.Inbound indirect flight with Frontier Airlines, departs from San Diego International on Thu, 2 Apr, arriving in Tri-Cities.Price includes taxes and charges.From 424 €, select.
San Diego.492 € per passenger.Departing Thu, 18 Jun, returning Mon, 22 Jun.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Thu, 18 Jun, arriving in San Diego International.Inbound indirect flight with Delta, departs from San Diego International on Mon, 22 Jun, arriving in Tri-Cities.Price includes taxes and charges.From 492 €, select.
San Diego.529 € per passenger.Departing Mon, 29 Jun, returning Wed, 1 Jul.Return flight with Breeze Airways and Frontier Airlines.Outbound indirect flight with Breeze Airways, departs from Tri-Cities on Mon, 29 Jun, arriving in San Diego International.Inbound indirect flight with Frontier Airlines, departs from San Diego International on Wed, 1 Jul, arriving in Tri-Cities.Price includes taxes and charges.From 529 €, select.
San Diego.642 € per passenger.Departing Wed, 27 May, returning Wed, 27 May.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Wed, 27 May, arriving in San Diego International.Inbound indirect flight with Delta, departs from San Diego International on Wed, 27 May, arriving in Tri-Cities.Price includes taxes and charges.From 642 €, select.

Find the cheapest month to fly from Tri-Cities to San Diego

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Tri-Cities to San Diego flights are currently cheapest in April.
Mar
from 419 €
Apr
from 301 €
May
from 642 €
Jun
from 492 €
Jul
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Aug
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Sep
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Oct
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Nov
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Dec
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Jan
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Feb
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Alternative Tri-Cities to San Diego routes

Looking for the cheapest, fastest or easiest route from Tri-Cities to San Diego? You could fly into the following airports instead.

San Diego International

4km from central San Diego
ClosestCheapest
from 301 €
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McClellan-Palomar

48km from central San Diego
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Kingsport to San Diego: Flight information

The things to know before you go.
Cheapest flight found301 €
Cheapest month to flyApril

Finding cheap flights from Tri-Cities to San Diego: Frequently asked questions

There are 2 airports in San Diego: San Diego International and McClellan-Palomar.
The best price we found for a return flight from Tri-Cities to San Diego is 301 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Tri-Cities to San Diego. But we found flights with one or more stops from 301 €.
As of March 2026, there are no flights flying from Tri-Cities to San Diego.
The cheapest month to fly from Tri-Cities to San Diego is usually April.
If you're flying from Tri-Cities Airport, the cheapest airport near San Diego is San Diego International – which is 4.1 km away from the centre of San Diego. We've found flights into this airport from 301 €.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Tri-Cities Airport to San Diego on Friday, 10 April 2026.
No airlines currently offer direct flights between Tri-Cities Airport and San Diego. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Diego but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Diego is around 40 days in advance, so don’t leave your flight to the last minute.
In March, the average temperature is usually around 14°C. August is typically the warmest month in San Diego, when it usually averages around 28°C. You can expect the least rain in June. The coldest month is December, with temperatures averaging 10°C. The rainiest month is February.
Currently, Delta offers the cheapest flight tickets to San Diego.

Travelling from Tri-Cities Regional Airport (TRI) to San Diego: what you need to know

  • The timezone in San Diego is UTC-7. The city is three hours behind Kingsport, where Tri-Cities Regional Airport is located.

  • To avoid missing your TRI to San Diego flight, allow plenty of time for things like baggage drop and finding your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the standard rule.

  • Longer lines at check-in and security are more likely if you're jetting off during high season, so give yourself a bit more breathing room. A good rule for peak periods? Get there up to four hours ahead for international flights and two hours for domestic departures.

  • To reach TRI from central Kingsport, it takes about 25 minutes if you're going by car. It's roughly 16 kilometres from the airport to the city centre.

  • Looking for a hotel close to TRI? If you've booked an early flight from Tri-Cities Regional Airport to San Diego, these accommodation options will put you moments from check-in:

  • 79.37% of flights that depart Tri-Cities Regional Airport reach their destination on schedule.

  • You'll find TRI at 2525 Tennessee 75.

How to find the cheapest flights from Tri-Cities Regional Airport (TRI) to San Diego

  • 214 € is currently the lowest price for a one-way Tri-Cities Regional Airport to San Diego flight. A return plane ticket starts from 301 €. These fares can change based on demand and availability.

  • Don't wait until the last moment. You're more likely to pick up cheap flights from TRI to San Diego if you book in advance. Airlines often have some excellent early bird deals.

  • The 'Whole month' tool will show you the cheapest tickets from Tri-Cities Regional Airport to San Diego across the month. It's a great way to snap up a bargain if your travel dates are flexible.

  • There's no need to check back in every day to find out if fares have dropped when you set up a Price Alert. We'll notify you as soon as there's an even better deal on cheap flights from TRI to San Diego.

  • Pick your preferred arrival and departure times, number of stops and airlines with our filters. Then, sort the results for your flight from Tri-Cities Regional Airport to San Diego by 'Best,' 'Fastest' or 'Cheapest.'

Airports in San Diego

San Diego International Airport (SAN)

  • The distance from San Diego International Airport (SAN) to central San Diego is roughly 5 kilometres. It'll take you about 10 minutes to get to the centre driving.

  • It takes around 20 minutes if you're travelling by public transport.

  • The last thing you need is a lengthy journey to your hotel if you're arriving on a late flight from Tri-Cities Regional Airport to San Diego. Stay at one of these accommodation options near SAN instead:

  • Go where the road takes you with a San Diego International Airport rental car. Book your wheels from Thrifty, Dollar or Budget and venture far and wide through San Diego and beyond.

  • Booking your vehicle from San Diego International Airport around two weeks ahead of your flight from TRI to San Diego can help you lock in the lowest rate.

  • SAN is located at N Harbour Dr.

McClellan-Palomar Airport (CLD)

  • After your flight from Tri-Cities Regional Airport to San Diego has arrived, you can reach the city centre in about 40 minutes by car. Central San Diego is roughly 56 kilometres from McClellan-Palomar Airport (CLD).

  • The trip will take roughly 2 hours 15 minutes on public transport.

  • You'll find some great places to call home for the night near CLD. Settle in and get cosy after your TRI to San Diego flight at one of these perfectly located options:

  • No need to worry about public transport schedules or cab lines. Pick up a McClellan-Palomar Airport rental car and blaze your own trail. Check out the rates and availability from Budget, Hertz and Avis.

  • Avoid filling out forms on the spot and save time at the rental desk by completing your booking beforehand. Reserve your ride from CLD ahead of time so you can just get the keys and go.

Best time to go to San Diego

  • Before you book your flights from Tri-Cities Regional Airport to San Diego, consider which time of year works best for you. Peak season in San Diego offers a bustling atmosphere and plenty of activities, while low season brings cheaper deals on hotels and fewer crowds.

  • Book a Tri-Cities Regional Airport to San Diego plane ticket with a departure in August if you're eager to visit the city during its warmest month. Expect temperatures to range from 17ºC (63ºF) to 28ºC (82ºF).

  • Search for cheap tickets from TRI to San Diego in February if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 7ºC (45ºF) and 23ºC (73ºF) on average.

More about San Diego

  • Once you've booked your flight from Tri-Cities Regional Airport to San Diego, find a hotel that keeps you close to what you want to see. Make one of these options your base for exploring San Diego:

  • There are so many things to discover in this city it can be tricky to work out where to begin. USS Midway Museum, San Diego Zoo and SeaWorld San Diego are leading attractions which should feature on any good San Diego itinerary.

Explore more of United States

  • You've seen San Diego, now it's time to explore other parts of United States. Journey about 177 kilometres north-west to Los Angeles to tick off its leading attractions. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, your itinerary will be busy.

  • Around 483 kilometres east of San Diego, Phoenix is another essential stop in United States. Experience this destination's highlights firsthand at Desert Botanical Garden, Heard Museum and Papago Park.

Plan the rest of your trip from Kingsport to San Diego

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.