Cheap Flights to Boulder County from ￥12,310

View ￥12,310 flight on Tue, Jan 20, 2026Opens in a new window

Popular airlines to Boulder County

  • Frontier Airlines

    Frontier Airlines

  • American Airlines

    American Airlines

  • Delta

    Delta

  • United

    United

  • Southwest Airlines

    Southwest Airlines

  • Alaska Airlines

    Alaska Airlines

  • JetBlue Airways

    JetBlue Airways

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 40% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

How much is the cheapest flight to Boulder County?

Prices were available within the past 7 days and start at ￥12,310 for one-way flights and ￥24,620 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Jan 31 - Sat, Feb 7
LAX
Los Angeles
DEN
Denver
￥24,620 Roundtrip, found 2 hours ago
￥24,620
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Jan 31 from Los Angeles to Denver, returning Sat, Feb 7, priced at ￥24,620 found 2 hours ago
Delta
Sat, Jan 31 - Sat, Feb 7
LAX
Los Angeles
DEN
Denver
￥24,620 Roundtrip, found 2 hours ago
￥24,620
Roundtrip
found 2 hours ago
Select Delta flight, departing Sat, Jan 31 from Los Angeles to Denver, returning Sat, Feb 7, priced at ￥24,620 found 2 hours ago
Alaska Airlines
Wed, Feb 4 - Sat, Feb 7
LAX
Los Angeles
DEN
Denver
￥27,660 Roundtrip, found 1 day ago
￥27,660
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Feb 4 from Los Angeles to Denver, returning Sat, Feb 7, priced at ￥27,660 found 1 day ago
Alaska Airlines
Sat, Jan 31 - Sat, Feb 7
ONT
Ontario
DEN
Denver
￥27,700 Roundtrip, found 2 hours ago
￥27,700
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sat, Jan 31 from Ontario to Denver, returning Sat, Feb 7, priced at ￥27,700 found 2 hours ago
Hawaiian Airlines
Tue, Jan 20 - Sat, Jan 24
LAX
Los Angeles
DEN
Denver
￥30,780 Roundtrip, found 12 hours ago
￥30,780
Roundtrip
found 12 hours ago
Select Hawaiian Airlines flight, departing Tue, Jan 20 from Los Angeles to Denver, returning Sat, Jan 24, priced at ￥30,780 found 12 hours ago
United
Wed, Mar 11 - Wed, Mar 11
ONT
Ontario
DEN
Denver
￥34,710 Roundtrip, just found
￥34,710
Roundtrip
just found
Select United flight, departing Wed, Mar 11 from Ontario to Denver, returning Wed, Mar 11, priced at ￥34,710 just found
Singapore Airlines
Tue, Sep 8 - Mon, Sep 14
NRT
Tokyo
DEN
Denver
￥136,570 Roundtrip, found 4 days ago
￥136,570
Roundtrip
found 4 days ago
Select Singapore Airlines flight, departing Tue, Sep 8 from Tokyo to Denver, returning Mon, Sep 14, priced at ￥136,570 found 4 days ago
STARLUX Airlines
Tue, Apr 7 - Tue, Apr 21
KIX
Osaka
DEN
Denver
￥154,800 Roundtrip, found 4 days ago
￥154,800
Roundtrip
found 4 days ago
Select STARLUX Airlines flight, departing Tue, Apr 7 from Osaka to Denver, returning Tue, Apr 21, priced at ￥154,800 found 4 days ago
WestJet
Thu, Jan 15 - Mon, Jan 19
NRT
Tokyo
DEN
Denver
￥155,580 Roundtrip, found 1 day ago
￥155,580
Roundtrip
found 1 day ago
Select WestJet flight, departing Thu, Jan 15 from Tokyo to Denver, returning Mon, Jan 19, priced at ￥155,580 found 1 day ago
EVA Airways
Wed, Apr 15 - Tue, Apr 21
HND
Tokyo
DEN
Denver
￥160,050 Roundtrip, found 9 hours ago
￥160,050
Roundtrip
found 9 hours ago
Select EVA Airways flight, departing Wed, Apr 15 from Tokyo to Denver, returning Tue, Apr 21, priced at ￥160,050 found 9 hours ago

Airports in Boulder County

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Denver Intl. DEN. Cheapest option available. Flights from ￥75,820
DEN
Denver Intl.
Cheapest
Flights from ￥75,820

2025 年 5 月 13 日、新規開設*

ハワイアン航空はこのたび、東京の成田国際空港からシアトルへの直行便を新たに開設し、毎日運航することを発表しました。

豊かな緑に包まれたその景観から「エメラルド シティ」と呼ばれるシアトルは、美しい自然と現代的な快適さをともに楽しみたい人の旅行先として人気の都市です。

シアトルを象徴するタワー、スペース ニードルからの素晴らしい眺めを堪能し、パイク プレイス マーケットの知られざる魅力や誰もが知る見どころを探訪して、ケリー パークで一息ついたら、夕暮れ時の街並みを眺めましょう。ピュージェット湾でのホエールウォッチングもおすすめです。

シアトルの空港は米国国内線のハブ空港でもあるため、米国各地への旅もさらにスムーズになります。

*政府の承認が必要となります。

Frequently asked questions

How do I find cheap flights to Boulder County that have flexible change policies?
Search for low-cost flights to Boulder County, then tick the "No change fee" box directly below the "Flexible change policies" heading. It really is that simple. We understand that travel plans change and flexibility matters, so book with confidence with Expedia.
Which airlines fly to Boulder County?
You can take your pick of a selection of airlines with flights into or near Boulder County. A few of your options are:

  • United Airlines - 13,033 flights to or near Boulder County each month, including 13,033 flights to Denver Intl. Airport (DEN) per month.
  • Southwest Airlines - 6,339 flights to or near Boulder County each month, including 6,339 flights to Denver Intl. Airport (DEN) per month.
  • Frontier Airlines - 1,967 flights to or near Boulder County each month, including 1,967 flights to Denver Intl. Airport (DEN) per month.

How can I find cheap tickets to Boulder County?
You'll always walk away with a terrific deal with Expedia, but our "flexible dates" search function makes it even easier. Enter your preferred travel date, then tick the flexible dates box above to see prices for nearby days. ￥24,620 was the cheapest price for a flight to Boulder County in the last seven days.
How much is a flight to Boulder County?
There were plenty of bargain fares for the taking in the last seven days, with the price of a return flight to Boulder County varying between ￥24,620 and ￥160,050. Many lucky vacationers purchased one-way flights from Los Angeles (LAX) for as little as ￥12,310.
What are the most popular airports to fly into in Boulder County?
Fly into Denver Intl. Airport (DEN) and experience all that Boulder County has to offer. As the region's primary entry point, approximately 24,249 flights touch down here each month.
How much is a plane ticket to Boulder County?
In the last seven days, tickets to Boulder County ranged between ￥24,620 and ￥160,050. The early bird catches the worm, so land yourself an awesome deal today.
What months are the cheapest to book a flight to Boulder County?
February is a cheap month to purchase a seat for your Boulder County getaway. Airfares cost the most during December, so steer clear of this time if possible.

Trending flights to Boulder County

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Singapore Airlines
Tue, Sep 8 - Mon, Sep 14
NRT
Tokyo
DEN
Denver
￥136,570 Roundtrip, found 4 days ago
￥136,570
Roundtrip
found 4 days ago
Select Singapore Airlines flight, departing Tue, Sep 8 from Tokyo to Denver, returning Mon, Sep 14, priced at ￥136,570 found 4 days ago
*Available to Expedia members.