Duffel is a London-based travel software company that provides APIs for booking, managing, and selling flights and travel extras. It serves travel sellers and other businesses that need programmable access to airline inventory and booking workflows.
Access to pre-IPO shares is available to accredited investors through UpMarket.
Latest Price
Previous Price
Series B Sep 2019
How to Invest in Duffel Through UpMarket
Duffel shares are not on public exchanges. UpMarket provides accredited investors access through secondary market transactions.
Step 01
Verify accredited investor status
Confirm eligibility under SEC Rule 501 of Regulation D. Income or net worth threshold applies.
Step 02
Create an UpMarket account
Complete KYC/AML onboarding. Typically 1–2 business days. Licensed rep assigned on signup.
Step 03
Review available Duffel offerings
Full offering memoranda and risk disclosures provided before any commitment is required.
Step 04
Complete subscription documents
Review and sign subscription agreement. All documents handled digitally through the platform.
Step 05
Fund your investment
Wire transfer or ACH. $50K minimum. Funds held in custodial account until close.
Pre-IPO investments are illiquid, speculative, and involve risk of total loss of capital.
$1.3B+
UpMarket has brokered over $1.3 billion in alternative investments*
*Includes principal invested and appreciation of investments originated via the UpMarket platform based on historical trade volume and valuation estimates through March 31, 2026. Of the total, approximately $301 million is managed by UpMarket Management, with the remaining originated investments managed by affiliates. Past performance is not predictive of future results.
Valuation Growth Over Time
Post-money valuation by round
Previous roundsMost recent
Date
Round
PPS (split-adj.)
Valuation
Mar 2020
Series C
Sep 2019
Series B
Why Investors Are Watching Duffel
Growth Signal
Duffel raised $30M Series B to launch travel API platform
Duffel announced a $30 million Series B led by Index Ventures, with Benchmark and Blossom Capital also participating. The round brought total known venture funding to $56.3 million as it launched its travel booking platform.
Competitive Moat
Duffel plugs airlines directly into booking via API
Duffel says its API lets travel agencies connect directly to airlines' reservation systems to pull real-time flight offers and make bookings. Index Ventures said the platform launched with major airlines including American Airlines, British Airways and Lufthansa Group.
TechCrunch reported Duffel was building a new way to book travel online, aiming at the booking experience end to end. Business Travel News later said the company was looking to new entrants to accelerate growth, highlighting room in travel distribution tech.
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No. As of March 2026, Duffel is a private company and does not trade on any public stock exchange. Accredited investors can access Duffel shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Duffel does not have a public stock price because it is privately held. The most recent known share price comes from its last funding round. Pre-IPO share prices on the secondary market may differ from the last round price depending on supply, demand, and market conditions.
Yes. Accredited investors can indicate interest in Duffel shares through UpMarket by filling out the form on this page or creating an account at upmarket.co. All pre-IPO offerings are subject to availability and require a $50,000 minimum investment. UpMarket is a FINRA-registered broker-dealer and has brokered more than $500M in alternative investments since 2019.
Pre-IPO investments carry significant risks. Duffel shares are illiquid, meaning there is no public market to sell them quickly. There is no guaranteed exit timeline or return. The investment is speculative in nature, and investors should be prepared for the possibility of total loss. Valuations of private companies can fluctuate substantially between funding rounds. Investors should consult their financial advisor and review all offering documents before investing.
In a pre-IPO transaction, accredited investors purchase shares from existing shareholders (such as employees, early investors, or other holders) through secondary market platforms. The company itself does not issue new shares in these transactions. UpMarket facilitates these trades as a FINRA-registered broker-dealer, handling compliance, documentation, and settlement on behalf of both parties.
There are two primary exit paths for pre-IPO holdings: selling your shares on the secondary market to another buyer, or holding until the company completes an IPO or is acquired. Both paths are subject to transfer restrictions, company approval (right of first refusal), and market conditions. The timing of any exit is unpredictable, and investors should plan for a multi-year holding period.
The minimum investment for most pre-IPO offerings on UpMarket is $50,000. This amount may vary depending on the specific offering and share availability. There are no fees to create an UpMarket account or browse available investments. Investors only pay transaction-related fees when they complete an investment.
UpMarket's valuation estimate of is derived from a proprietary model that incorporates multiple data sources: funding round data (Caplight), revenue estimates (Sacra), secondary market pricing, and public company comparables. The model applies a private company discount to the public comp multiple to account for illiquidity and information asymmetry. This estimate is not investment advice and may differ substantially from the price at which shares actually trade.
Duffel provides APIs for booking, managing, and selling flights and travel extras to travel sellers and businesses, and raised a $30M Series B to launch its travel API platform — accredited investors can access Duffel stock through UpMarket.