The cheapest times to fly from SDF to HEL are

  • January 1st to March 25th
  • April 16th to May 13th
  • October 22nd to December 9th (except the week of November 19th)

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 SDF to HEL is late January and early February. Prices can be as high as $2727 for Thursday flights during early to mid August, or as low as $948 for Wednesday flights around late January and early February.


When to Fly to Helsinki

Flying from Louisville, KY (SDF) to Helsinki (HEL) will usually cost between $948 to $2395 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January and early February with an average ticket price of $948. Due to high demand the most expensive time to fly is early to mid August, with an average price of $2556. Planning your trip to low-cost times can easily save you $1608 on economy flights and even more on first-class flights. Generally, any price below $1125 can be considered a good price for a round-trip SDF to HEL flight.

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

SDF to HEL Flight Prices

Compared to other flights, the SDF to HEL flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Louisville. The average price per mile (for a direct flight) is $0.15, which is far below average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to fly to HEL, and Tuesday the cheapest day to fly back into SDF. Thursdays are the most expensive days to fly to Helsinki, and Fridays are the most expensive days to return to Louisville. Selecting flights on the least expensive days could save you up to $121 (8%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $1320. Return trip prices are from the HEL to SDF 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 SDF to HEL can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 9 hour 15 minutes may not be realistic.


Flight Hacking SDF to HEL

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 SDF to HEL — but Champion Traveler does!

Hack #1: New York, NY (SDF > JFK > HEL)

  • Price for both tickets: $760
  • Average savings: $365 (32.44%)

See SDF to JFK flights

Hack #2: Boston, MA (SDF > BOS > HEL)

  • Price for both tickets: $767
  • Average savings: $359 (31.87%)

See SDF to BOS flights

Hack #3: Newark, NJ (SDF > EWR > HEL)

  • Price for both tickets: $817
  • Average savings: $309 (27.42%)

See SDF to EWR flights


Flight Questions Answered

Still have questions about flying from SDF to HEL? We’ve got answers.

Which airlines fly this route?

You can find 16 major airlines flying this route most often: Air Canada, Air France, Alitalia, American, Austrian, British Airways, Brussels Airlines, Delta, Finnair, Iberia, KLM, Lufthansa, SAS, Tap Air Portugal, Turkish Airlines, United, and potentially more during busy seasons.

How far away is it from Helsinki Vantaa Airport to Louisville International-Standiford Field Airport?

The distance between the two airports is roughly 4591 miles or 7388 kilometers.

How long does it take to fly from SDF to HEL?

The real-world flight time for a nonstop SDF to HEL flight is about 9 hour 15 minutes.

How many flights go between Louisville, KY and Helsinki?

It depends on the day of the week and the date, but a typical day might have around 10 available flights from SDF to HEL.


Airport Location Info


Departing Airport

Origination code SDF
Origination airport name Louisville International-Standiford Field Airport
City Louisville, KY
Country the United States
Latitude 38.2
Longitude -85.7

Return Airport

Destination code HEL
Destination airport name Helsinki Vantaa Airport
City Helsinki
Country Finland
Latitude 60.3
Longitude 25


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.