Title: $730 Cheap flights from Helena to Eureka (HLN to ACV) - Expedia.com ![](https://images.trvl-media.com/place/287/6ab3fbf1-1e1b-4ff4-9b6b-bcac85ef6b2c.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/287/6ab3fbf1-1e1b-4ff4-9b6b-bcac85ef6b2c.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # $730 Cheap Flights from Helena (HLN) to Eureka (ACV) [View $730 flight on Fri, Mar 20, 2026](https://expedia.com/Flights-Search?trip=oneway&leg1=from:HLN,to:ACV,departure:3/20/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:729.20&airProductToken=AQprCjMI1YIBEgQ0NjYwGOdqIINpKP-PiAMw_5CIAzhFQABYAWoHRUNPTk9NWXIIRUFBME9ERU4KNAjVggESBDU1MDYYg2kgwKgBKLKSiAMw8ZOIAzhFQAFYAWoHRUNPTk9NWXIIRUFBME9ERU4SCggBEAEYASoCVUEYASIECAEQASgCKAMoBDAB) ## Popular airlines from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_B6.svg) JetBlue Airways [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines [](https://www.expedia.com/Flights-Search?leg1=from:HLN,to:ACV,departure:3/26/2026TANYT&leg2=from:ACV,to:HLN,departure:4/2/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) ## Cheap Flights from Helena to Eureka (HLN-ACV) Prices were available within the past 7 days and start at $730 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![](https://forever.travel-assets.com/flex/flexmanager/images/2026/02/06/expedia-sale-2026-desktop-us-ca.jpg?impolicy=fcrop&w=1400&h=600&q=mediumHigh) ## The Annual Vacation Sale Members save up to 40% on hotels and homes. Plan this year’s big trip and save. [Book now](https://expedia.com/deals?rfrr=FTG_SPRING_PROMO_) ## Frequently asked questions ### How much does a flight from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka) cost? ### What is the cheapest month to fly from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### Which airlines fly direct from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### What is the cheapest airline that flies from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### How do I find cheap flights from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### What is the best time to fly from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### What is the earliest flight from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### How long does it take to fly from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### Can you fly business or first class from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ### How do I earn miles on a Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka) flight with Expedia? ### Is it cheaper to buy a plane ticket from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka) at the last minute? ### Is it cheaper to book a Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka) flight and hotel package? ### Can I cancel or change the date of my flight from Helena, MT (HLN-Helena Regional) to Eureka, CA (ACV-Arcata - Eureka)? ## Travel information | Origin airport | Helena Regional | | ------------------- | --------------- | | Destination airport | Arcata - Eureka | | Distance | 717 mi | ## Book with confidence # Helena to Eureka Flights The cheapest times to fly from Helena to Eureka On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Helena to Eureka are during the month of . You can find some of the cheapest flights from Helena to Eureka with Expedia's search tool and vast selection of airlines. The best time to book a flight from Helena to Eureka Sunday is one of the best days to book for cheap flights from Helena to Eureka: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance. How to find cheap round-trip tickets from Helena to Eureka Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Helena to Eureka in 2026\. You can also book with separate airlines for your outbound and return journeys, from $730 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference\*. This is available for a small fee, and is free to One Key Gold and Platinum tier members. Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Helena to Eureka flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps. You could also save big by booking one of Expedia's [vacation packages](https://www.expedia.com/package-deals). Bundling together your Helena to Eureka airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures. \*Terms apply. Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023\. 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